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decrypting-embedded-configuration

Decrypts statically embedded malware configuration blobs by trying common schemes (single-byte and multi-byte XOR, RC4, base64 layers) and scoring decoded output for config-like content. Activates for requests to decrypt an embedded config, recover hardcoded settings from a blob, or brute-force a configuration encryption scheme.

The English summary is being prepared. Showing the original description.

See how to install

Files included (4)

  • SKILL.md2.7 KB
  • LICENSE340 B
  • references/api-reference.md1.3 KB
  • scripts/analyst.py3.4 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Decrypting Embedded Configuration

When to Use

  • You have an extracted config blob (from a resource, .data section, or overlay) that is XOR/RC4/ base64-obfuscated and want to recover plaintext settings.
  • You need a quick brute-force over common schemes before writing a family-specific decryptor.

Do not use this on a live-decrypted-in-memory config — for that use the memory config skill. This works statically on the extracted blob and executes nothing.

Prerequisites

  • The extracted ciphertext blob and (optionally) a candidate key.

Safety & Handling

  • Treat decoded endpoints as live C2; defang before sharing.

Workflow

Step 1: Try single-byte XOR

python scripts/analyst.py xor blob.bin

Brute-forces all 256 single-byte keys and scores each output for printable ratio and config tokens (http, .php, IP patterns, id=).

Step 2: Try RC4 / multi-byte XOR with a key

python scripts/analyst.py rc4 blob.bin --key mysecret
python scripts/analyst.py xorkey blob.bin --key 0x11,0x22,0x33

Step 3: Peel base64 / repeat

If output is base64, decode and re-run the scheme search on the result.

Step 4: Extract and defang

Pull URLs/IPs/keys from the best-scoring plaintext and defang.

Validation

  • The chosen scheme yields a high printable ratio and real config tokens.
  • Recovered endpoints parse as valid hosts/URLs.
  • Output is defanged before sharing.

Pitfalls

  • Single-byte XOR coincidentally producing some ASCII — require config tokens, not just printables.
  • RC4 key drop-bytes variants (RC4-drop) needed by some families.
  • Nested layers (base64 over XOR over RC4) requiring multiple passes.

References

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