General

  • Target
    545d4b0dcf911ffdf44b5bf01dfef7be8421e05250806eb03ffb25e736961b80
  • Size 625KB
  • Sample220508-jf4whsecdk
  • SHA256 545d4b0dcf911ffdf44b5bf01dfef7be8421e05250806eb03ffb25e736961b80
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • quasar

Version
  • 2.1.0.0

Botnet
  • 1

C2
  • 10.0.2.15:1337

Mutex
  • VNM_MUTEX_28broDsmlFWTzx7r3B

Attributes
  • encryption_key

    0hi0YaDWMh7jhT37Tcsm

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Defender

  • subdirectory

    SubDir

Targets

    • Target
      545d4b0dcf911ffdf44b5bf01dfef7be8421e05250806eb03ffb25e736961b80
    • Size 625KB
    • SHA256 545d4b0dcf911ffdf44b5bf01dfef7be8421e05250806eb03ffb25e736961b80
    • MD5 SHA1 SHA512
    • Contains code to disable Windows Defender

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

    • 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

    • suricata: ET MALWARE W32/Quasar 1.3/Venom RAT Connectivity Check 3

      suricata: ET MALWARE W32/Quasar 1.3/Venom RAT Connectivity Check 3

    • Executes dropped EXE

    • Checks computer location settings

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

    • Loads dropped DLL

    • 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.

MITRE ATT&CK Enterprise v6

Tasks