reverse-skills-max: initial public release (restored, redacted, hardened)

vendor-new/analyst-ai-pack/skills/analyzing-wiper-malware/scripts/analyst.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+"""Scan a sample for destructive wiper primitives and classify wiper vs ransomware.
+
+Detects raw-disk/MBR overwrite primitives, backup/recovery destruction commands, and weighs them
+against ransomware (encryption/extortion) indicators to classify intent. Reads bytes statically;
+executes nothing.
+"""
+from __future__ import annotations
+
+import argparse
+import json
+import re
+import sys
+from pathlib import Path
+
+ASCII_RE = re.compile(rb"[\x20-\x7e]{4,}")
+UTF16_RE = re.compile(rb"(?:[\x20-\x7e]\x00){4,}")
+
+RAW_DISK = ["\\\\.\\physicaldrive", "\\\\.\\c:", "deviceiocontrol", "ioctl_disk",
+            "createfilemapping", "setfilepointer", "\\device\\harddisk"]
+BOOT_TAMPER = ["this program cannot be run", "mbr", "\\\\.\\physicaldrive0", "bootmgr is missing"]
+RECOVERY_DENIAL = ["vssadmin delete shadows", "vssadmin.exe delete", "wbadmin delete",
+                   "bcdedit /set", "recoveryenabled no", "wevtutil cl", "delete catalog",
+                   "shadowcopy delete"]
+MASS_DELETE = ["deletefile", "removedirectory", "shfileoperation", "writefile", "f0 fill",
+               "overwrite"]
+RANSOM_INDICATORS = ["cryptencrypt", "cryptdecrypt", "bcryptencrypt", "readme.txt", "decrypt",
+                     ".onion", "bitcoin", "ransom", "your files have been encrypted",
+                     "aes", "rsa public key"]
+
+
+def _strings(data: bytes) -> str:
+    parts = [m.decode("ascii", "ignore") for m in ASCII_RE.findall(data)]
+    parts += [m.decode("utf-16-le", "ignore") for m in UTF16_RE.findall(data)]
+    return "\n".join(parts).lower()
+
+
+def scan(path: str) -> dict:
+    blob = _strings(Path(path).read_bytes())
+    raw = sorted({r for r in RAW_DISK if r in blob})
+    boot = sorted({b for b in BOOT_TAMPER if b in blob})
+    recovery = sorted({r for r in RECOVERY_DENIAL if r in blob})
+    deletion = sorted({d for d in MASS_DELETE if d in blob})
+    ransom = sorted({r for r in RANSOM_INDICATORS if r in blob})
+    destructive_score = len(raw) * 2 + len(boot) * 2 + len(recovery) + len(deletion)
+    ransom_score = len(ransom)
+    if destructive_score >= 3 and ransom_score <= 1:
+        classification = "likely_wiper"
+    elif ransom_score >= 3:
+        classification = "likely_ransomware"
+    elif destructive_score and ransom_score:
+        classification = "destructive_with_ransom_facade"
+    else:
+        classification = "inconclusive"
+    return {
+        "raw_disk_primitives": raw,
+        "boot_record_tampering": boot,
+        "recovery_denial": recovery,
+        "mass_deletion": deletion,
+        "ransomware_indicators": ransom,
+        "destructive_score": destructive_score,
+        "ransomware_score": ransom_score,
+        "classification": classification,
+    }
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser(description="Analyze wiper malware")
+    sub = parser.add_subparsers(dest="cmd", required=True)
+    p = sub.add_parser("scan")
+    p.add_argument("file")
+    args = parser.parse_args(argv)
+    print(json.dumps(scan(args.file), indent=2))
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())