Overview

overview

10

Static

static

8bbc3dd05b...4e.exe

windows7_x64

1

8bbc3dd05b...4e.exe

windows10-2004_x64

10

Sharing

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General

  • Target
    8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e
  • Size 783KB
  • Sample220320-cyv8rsfcam
  • SHA256 8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e
  • MD5 SHA1 SHA512
Score
10/10
quasarvenomratoffice04evasionpersistenceratrootkitspywarestealertrojan

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
    • SHA256 8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e
    • MD5 SHA1 SHA512
    Score
    10/10
    quasarvenomratoffice04evasionpersistenceratrootkitspywarestealertrojan

    • 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

      evasiontrojan

    • Quasar Payload

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • VenomRAT

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

      ratrootkitstealervenomrat

    • Executes dropped EXE

    • Checks computer location settings

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

    • Windows security modification

      evasiontrojan

    • Adds Run key to start application

      persistence

    • 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

    behavioral1behavioral2

MITRE ATT&CK Enterprise v6

Tasks