General

  • Target

    a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

  • Size

    629KB

  • Sample

    220508-wlcqfaecc2

  • MD5

    4df6edc58b2aee8108bbf41a5281a0b3

  • SHA1

    372c881c85e6dd404ff65a086b0c7dd8e300ec19

  • SHA256

    a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

  • SHA512

    3787c1833a05a31e1aa9a92e5b2dc081911ca98a490bd78c978d20d3d6ff5c4ab9081e6f0d4fe31e190bc454a73ddd641391969e310ecfa65f79963f2e3e2455

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Windows Defender Security Host

C2

vilvaraj-32652.portmap.io:32652

Mutex

VNM_MUTEX_s1ArJSYbui8dt0HUpJ

Attributes
  • encryption_key

    8gl4TCjsLQUmqCIxalku

  • install_name

    Windows Defender Security Host.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Defender Security Host

  • subdirectory

    SubDir

Targets

    • Target

      a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

    • Size

      629KB

    • MD5

      4df6edc58b2aee8108bbf41a5281a0b3

    • SHA1

      372c881c85e6dd404ff65a086b0c7dd8e300ec19

    • SHA256

      a640fa0ec1f3da74886079154feb39fcdc8f03b850ab8ae47c35602e4df29d8c

    • SHA512

      3787c1833a05a31e1aa9a92e5b2dc081911ca98a490bd78c978d20d3d6ff5c4ab9081e6f0d4fe31e190bc454a73ddd641391969e310ecfa65f79963f2e3e2455

    • 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 Payload

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • VenomRAT

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

    • suricata: ET MALWARE Common RAT Connectivity Check Observed

      suricata: ET MALWARE Common RAT Connectivity Check Observed

    • Executes dropped EXE

    • Checks computer location settings

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

    • 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 v6

Tasks