General

  • Target

    4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

  • Size

    648KB

  • Sample

    221130-xch2jahc6w

  • MD5

    763dd9b7f2a5183a1380bee36889f936

  • SHA1

    cdc7f9911a853973fc83d0e1a51ee5e82da347c9

  • SHA256

    4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

  • SHA512

    7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

  • SSDEEP

    12288:Z8iNlD5ZS/1WEJOAqRSEM3Sy21LVbK89elrrJ56:vKIDAEQSy2TbKuKN

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

ajith

C2

23.105.131.178:7812

Mutex

VNM_MUTEX_NdVd2sPSSqFdo7I35g

Attributes
  • encryption_key

    jyerms3KOWmt3C9DBFuq

  • install_name

    Windows Defender Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    SubDir

Targets

    • Target

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

    • Size

      648KB

    • MD5

      763dd9b7f2a5183a1380bee36889f936

    • SHA1

      cdc7f9911a853973fc83d0e1a51ee5e82da347c9

    • SHA256

      4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

    • SHA512

      7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

    • SSDEEP

      12288:Z8iNlD5ZS/1WEJOAqRSEM3Sy21LVbK89elrrJ56:vKIDAEQSy2TbKuKN

    • 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.

    • 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