General

  • Target
    sample
  • Size 6.8MB
  • Sample251225-pbmdkawnez
  • SHA256 129ff30adb0167bcc6d90c1d3908a7db5ee1568e2ce1bbf89070b20e86532fd0
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Language
  • ps1

Deobfuscated
Source
URLs
  • exe.dropper

    https://github.com/BtbN/ffmpeg-builds/releases/download/latest/ffmpeg-master-latest-win64-gpl.zip

Extracted

Language
  • ps1

Deobfuscated
Source
URLs
  • exe.dropper

    https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip

Extracted

Language
  • ps1

Deobfuscated
Source
URLs
  • exe.dropper

    https://ffmpeg.org/releases/ffmpeg-6.0-full_build.zip

Extracted

Language
  • ps1

Deobfuscated
Source
URLs
  • exe.dropper

    https://github.com/BtbN/ffmpeg-builds/releases/download/latest/ffmpeg-master-latest-win64-gpl.zip

Targets

    • Target
      sample
    • Size 6.8MB
    • SHA256 129ff30adb0167bcc6d90c1d3908a7db5ee1568e2ce1bbf89070b20e86532fd0
    • MD5 SHA1 SHA512 SSDEEP
    • Contains code to disable Windows Defender

      A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

    • Detects SpecRAT payload

    • Modifies WinLogon for persistence

    • Modifies Windows Defender DisableAntiSpyware settings

    • Modifies Windows Defender Real-time Protection settings

    • Modifies Windows Defender TamperProtection settings

    • SpecRAT

      SpecRAT is an information stealer written in Go.

    • Specrat family

    • Badlisted process makes network request

      Network request originating from process or tool commonly abused by malware.

    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Possible privilege escalation attempt

    • Drops startup file

    • Executes dropped EXE

    • Modifies file permissions

    • Adds Run key to start application

MITRE ATT&CK Enterprise v16

Tasks