Fake Claude Opus 5 app delivers malware and wipes its own tracks
Incidents: Fake Claude Opus 5 GitHub repo delivers RevStealer malware that steals credentials and self-destructs.
Deep Analysis and Expert Commentary
The attack chain begins with social engineering lures on GitHub and game cheat sites, exploiting trust in these platforms. RevStealer demonstrates advanced evasion techniques including API resolution without import tables, kernel calls via indirect system calls, and live streaming of stolen data to avoid disk artifacts. Its use of Polygon blockchain for resilient C2 infrastructure shows threat actor sophistication in maintaining operational continuity. The malware's targeted collection of App-Bound encrypted browser data through debugger-controlled hardware breakpoints indicates specific focus on modern security protections. Defenders should prioritize execution prevention over detection, as recommended by Morphisec, through application control policies and memory protection mechanisms that disrupt the malware's operational requirements.
Action Items
- Block known IOCs from Morphisec's report at network and endpoint levels
- Implement application allowlisting to prevent unauthorized executables
- Enable tamper protection for Windows Defender exclusion lists
Original Article Brief Intro
Help Net Security · 2026-09-01 · Incidents: Fake Claude Opus 5 GitHub repo delivers RevStealer malware that steals credentials and self-destructs.
Related Terms and Notes
Malware Families
- Information Stealer
- RevStealer — Windows information stealer that targets credentials and cryptocurrency data with advanced evasion capabilities
Techniques / TTPs
- Credential Theft
Context Notes
- Blockchain C2
- Claude Opus 5
- GitHub Malware
- Polygon blockchain — Ethereum scaling solution used by malware for resilient command-and-control infrastructure
- Social Engineering
- Windows Defender
- Windows Malware