BeepRAT AMSI/ETW Bypass from AppData/Temp + Subsequent PowerShell Execution

Ibrahim Saud@tektrix

•updated Jun 30, 2026•0•0•0

Detects evidence of BeepRAT malware performing in-memory AMSI or ETW bypass techniques via process command line arguments (e.g., AmsiUtils, AmsiScanBuffer, EtwEventWrite) originating from volatile directories like AppData or Temp, followed by the execution of suspicious processes (PowerShell, csc.exe, msbuild.exe) within a 5-minute window on the same host.