Init. Commit

qualifiers/fvnclite-android-reverse-easy/solve/solve.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+from pathlib import Path
+import argparse, base64, hashlib, json, lzma, marshal, os, plistlib, re, struct, subprocess, sys, zipfile, zlib
+
+def xor(data, key):
+    return bytes(b ^ key[i % len(key)] for i, b in enumerate(data))
+
+def find_after(data, marker):
+    off = data.index(marker) + len(marker)
+    ln = struct.unpack_from('<I', data, off)[0]
+    off += 4
+    return data[off:off+ln]
+
+def main():
+    ap = argparse.ArgumentParser(); ap.add_argument('apk', nargs='?', default='../public/FvncLiteCourier.apk')
+    args = ap.parse_args()
+    with zipfile.ZipFile(args.apk) as z:
+        dex = z.read('classes.dex')
+        blob = z.read('assets/fvnc_table.bin')
+    key = re.search(rb'fvnc-lite-v4', dex).group(0)
+    cfg = json.loads(xor(blob, key))
+    print(cfg['audit.export'])
+if __name__ == '__main__': main()