Lion Cipher Lab

Extract a malware config: recover the C2, keys, campaign ID, and mutex

• Digital Forensics & IR (DFIR)
• Advanced
• ~50 min
• Free · no account required

Why it matters

Most modern commodity malware — botnets, RATs, stealers, loaders — does not carry its operational details in the clear. Instead it ships an embedded, ENCRYPTED configuration: a small blob of ciphertext tucked in a resource or section that the sample decrypts in memory at runtime to learn where to phone home, which campaign it belongs to, what mutex to create, and how often to beacon. Recovering that configuration — 'config extraction' — is one of the highest-value moves in all of malware analysis, because a single decrypted config hands you the campaign's whole indicator set at once (every C2…

What you'll learn

• locating an embedded encrypted configuration blob inside a PE resource/section
• identifying the decryption method (RC4) and recovering the key from the binary's own strings/imports
• dumping the plaintext config out of process memory the easy way — letting the sample decrypt itself and reading the result
• reading each config field as intelligence: C2 addresses, campaign/botnet ID, RC4 key, mutex, User-Agent, beacon interval
• explaining why the config is the intelligence goldmine — it yields the campaign IOCs and links samples to a family/actor
• mapping to MITRE ATT&CK T1027 (Obfuscated Files or Information) and T1140 (Deobfuscate/Decode Files or Information)
• judgment: when to crack the static blob vs dump the decrypted config from memory, and how a pro builds a family config-extractor for scale

Steps in this lab

1. The analyst's chair: what a malware 'config' is, and why you want it
2. The evidence bundle (read it once, top to bottom)
3. Artifact 1 — find the encrypted config blob (and prove it's encrypted)
4. Artifact 2 — recover the RC4 key from the binary's own strings
5. Artifact 3 — the easy way: dump the config the sample decrypted for you
6. Artifact 4 — read every field as intelligence (and let a sandbox scale it)
7. Correlate into one story: the config, the MITRE map, and the IOC sheet
8. The third rule — WHEN static vs memory, WHY it's the goldmine, HOW to scale it
9. Do it for real (optional) — and the takeaway

Open the full interactive lab →