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mukul975
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Complete skill folder anatomy across all cybersecurity skills: - scripts/agent.py: 80-150 line Python agents using real libraries (impacket, boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.) - references/api-reference.md: real API documentation with method signatures - LICENSE: MIT license for all skill folders
2.0 KiB
2.0 KiB
JavaScript Malware Deobfuscation API Reference
jsbeautifier (Python)
import jsbeautifier
opts = jsbeautifier.default_options()
opts.indent_size = 2
opts.wrap_line_length = 120
result = jsbeautifier.beautify(obfuscated_code, opts)
jsbeautifier CLI
# Beautify a file
js-beautify malicious.js -o output.js
# npx alternative
npx js-beautify script.js -o script_pretty.js
Common Decoding Patterns (Python)
import re, base64, urllib.parse
# Hex strings: \x68\x65\x6c\x6c\x6f -> hello
decoded = bytes.fromhex("68656c6c6f").decode("ascii")
# Unicode escapes: \u0068\u0065 -> he
decoded = chr(0x0068) + chr(0x0065)
# Base64 (atob equivalent)
decoded = base64.b64decode("aGVsbG8=").decode("utf-8")
# URL encoding (unescape equivalent)
decoded = urllib.parse.unquote("%68%65%6c%6c%6f")
# String.fromCharCode
decoded = "".join(chr(c) for c in [104, 101, 108, 108, 111])
Node.js VM Sandbox
const vm = require('vm');
const sandbox = {
eval: function(code) {
console.log("EVAL INTERCEPTED:", code.substring(0, 500));
return code;
},
document: { write: function(h) { console.log("DOC.WRITE:", h); } },
atob: function(s) { return Buffer.from(s, 'base64').toString(); },
window: { location: { href: "" } },
};
const context = vm.createContext(sandbox);
vm.runInContext(code, context, { timeout: 5000 });
CyberChef Operations
| Operation | Use Case |
|---|---|
| From Hex | Decode \xNN sequences |
| From Base64 | Decode atob() payloads |
| URL Decode | Decode unescape() strings |
| JavaScript Beautify | Format minified code |
| From CharCode | Decode fromCharCode arrays |
| XOR | Decode XOR-encrypted strings |
| Generic Code Beautify | Format mixed content |
IOC Extraction Regex
# URLs
re.findall(r'https?://[^\s"\'<>)]+', code)
# IP addresses
re.findall(r'\b(?:\d{1,3}\.){3}\d{1,3}\b', code)
# Domains
re.findall(r'(?:[a-zA-Z0-9-]+\.)+(?:com|net|org|io|xyz)\b', code)