General

  • Target

    8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e

  • Size

    783KB

  • Sample

    220320-cyv8rsfcam

  • MD5

    d677b73dcb14c399d5c986a6558356df

  • SHA1

    7b52f0235c834943078af0292636b335cd86e103

  • SHA256

    8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e

  • SHA512

    e00f0116fa1297dcf20b55c85c521af3cd8b66daa629ba475fd01173ceb1df66cf6c1ae1f2807b8c098d560afa073f23a84260b980c93df3ed173d4d81271126

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

C2

193.161.193.99:29069

Mutex

VNM_MUTEX_04STdugX9pbf1yeEFR

Attributes
  • encryption_key

    gOa6B7rJfhbU1IIsLE4i

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows LoginUI

  • subdirectory

    SubDir

Targets

    • Target

      8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e

    • Size

      783KB

    • MD5

      d677b73dcb14c399d5c986a6558356df

    • SHA1

      7b52f0235c834943078af0292636b335cd86e103

    • SHA256

      8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e

    • SHA512

      e00f0116fa1297dcf20b55c85c521af3cd8b66daa629ba475fd01173ceb1df66cf6c1ae1f2807b8c098d560afa073f23a84260b980c93df3ed173d4d81271126

    • 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.

    • Executes dropped EXE

    • Checks computer location settings

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

    • 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