Taking the FIRST look at Crypt0l0cker
Summary: Cisco Talos analyst Matthew Molyett used the FIRST IDA Pro plugin to port prior Crypt0l0cker analysis onto a sample that appeared on VirusTotal in April 2017, more than a month after the original Talos blog. FIRST matched 13 functions in the roughly 400 kb Nullsoft Installer file, then after the payload was extracted, identified 78 new Crypt0l0cker_* function markups out of 295 total known functions, including _WinMain@16.
Why it matters: The sample carried no detections naming Crypt0l0cker, TorrentLocker, or Teerac on VirusTotal, so family attribution came from function-level code matching rather than signatures. For a security leader, that gap is the stake: a ransomware binary can sit unidentified on VirusTotal until an analyst ports prior work onto it by hand.
Read the original at Cisco Talos ↗
- Topics
- Malware
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