General

  • Target

    e2664640d1772b5f9626787ba8f6c88084c7a3de046457eeec2f0ce6bd07d215

  • Size

    488KB

  • Sample

    220511-29t8aacfc3

  • MD5

    0f9120aa260daa1849a56062f8b6a492

  • SHA1

    a56e35f6cc5424936a56827d307253c56a937a0e

  • SHA256

    e2664640d1772b5f9626787ba8f6c88084c7a3de046457eeec2f0ce6bd07d215

  • SHA512

    ae52b328521f6a550951ac0c53745034f985230dcd850d0881079d1a2f50b865c30e646271dd4230f3d07db34bf6515b434bcf0f085f8e703533ae14180f81dc

Malware Config

Extracted

Family

quasar

Attributes
  • encryption_key

  • install_name

  • log_directory

  • reconnect_delay

    3000

  • startup_key

  • subdirectory

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

C2

193.161.193.99:25334

Mutex

VNM_MUTEX_3gEHJWUppmmJSCirO4

Attributes
  • encryption_key

    WrqRQZrwZ1NbyFhWiYhM

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Venom Client Startup

  • subdirectory

    SubDir

Targets

    • Target

      e2664640d1772b5f9626787ba8f6c88084c7a3de046457eeec2f0ce6bd07d215

    • Size

      488KB

    • MD5

      0f9120aa260daa1849a56062f8b6a492

    • SHA1

      a56e35f6cc5424936a56827d307253c56a937a0e

    • SHA256

      e2664640d1772b5f9626787ba8f6c88084c7a3de046457eeec2f0ce6bd07d215

    • SHA512

      ae52b328521f6a550951ac0c53745034f985230dcd850d0881079d1a2f50b865c30e646271dd4230f3d07db34bf6515b434bcf0f085f8e703533ae14180f81dc

    • 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 W32/Quasar 1.3/Venom RAT Connectivity Check 3

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

    • Executes dropped EXE

    • 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 NtSetInformationThreadHideFromDebugger

MITRE ATT&CK Enterprise v6

Tasks