General

  • Target

    380cd105672b970a3783c0036ebaf09d

  • Size

    1.0MB

  • Sample

    231222-awbp8sabh9

  • MD5

    380cd105672b970a3783c0036ebaf09d

  • SHA1

    112ee91c03921b1aaa3ca9b901054a62a11b0268

  • SHA256

    358b3681682b402dba9c1bf1297193fe257d8cc11e51c2924c657eb2057beb04

  • SHA512

    e3e7954328a98af7b4dd3ec0efa2c390f6d10b8e2037e582043902482f7e90241b0565c0da7972f14193efe517a305441306cb7c32b2f444ba5c58c1c7c5f2da

  • SSDEEP

    24576:Lw/UH7Q9OEKM4TbVOD6s6F+2iYNenwhhWZ0ZnLsm:FH7QAHTbVOD6sl2Zhh

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

SEP05

C2

23.105.131.187:7812

Mutex

VNM_MUTEX_mn3z5p1P4yabWtL9nJ

Attributes
  • encryption_key

    R5zGfMq4QEUio50PoLwo

  • install_name

    Windows Defender Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update Service

  • subdirectory

    Windows Security Firewall

Targets

    • Target

      380cd105672b970a3783c0036ebaf09d

    • Size

      1.0MB

    • MD5

      380cd105672b970a3783c0036ebaf09d

    • SHA1

      112ee91c03921b1aaa3ca9b901054a62a11b0268

    • SHA256

      358b3681682b402dba9c1bf1297193fe257d8cc11e51c2924c657eb2057beb04

    • SHA512

      e3e7954328a98af7b4dd3ec0efa2c390f6d10b8e2037e582043902482f7e90241b0565c0da7972f14193efe517a305441306cb7c32b2f444ba5c58c1c7c5f2da

    • SSDEEP

      24576:Lw/UH7Q9OEKM4TbVOD6s6F+2iYNenwhhWZ0ZnLsm:FH7QAHTbVOD6sl2Zhh

    • Contains code to disable Windows Defender

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

    • Modifies Windows Defender Real-time Protection settings

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • VenomRAT

      VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Loads dropped DLL

    • Windows security modification

    • Adds Run key to start application

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks