General

  • Target

    RDP Brute_Cracked.exe

  • Size

    1.7MB

  • Sample

    240712-bfemmascpk

  • MD5

    bd5cd7f77a38e709cb03b8b60cfcc15c

  • SHA1

    ed59b52ea4c63ffd6322bcb43155f2245048a541

  • SHA256

    4f66d0ced260b21359d60081d26c57bdeb3b54a293d084201589019d79379e8e

  • SHA512

    0f5973d3b16362cc2540065188bd3650be6622a8bf3b1bb6e310ec3f395292b916c0b1dd3514497a78efee847da16bf559eb21b3225d80ffb4ded4819a8a4b63

  • SSDEEP

    24576:Cj5yx6uJa4WiXV15W/F4A8A3GpF8EfE1FF1ehGXeRxm8F0EJSoUkgBbt:e59+WaV1J6GpFDEV1eEox10EPEbt

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

kgf6

C2

23.105.131.187:7812

Mutex

VNM_MUTEX_Yv6S9FB2pcVgrrmUN6

Attributes
  • encryption_key

    4Kz1OwOQ5f9Qc8aAEQ9S

  • install_name

    Windows Security Health Service.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    SubDir

Extracted

Family

quasar

Version

2.1.0.0

Botnet

kgf5

C2

23.105.131.187:7812

Mutex

VNM_MUTEX_NOLy9wmTFSi1F4L2HO

Attributes
  • encryption_key

    8jlBZS9It7EamPWEVqxP

  • install_name

    Windows Defender Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Security

  • subdirectory

    SubDir

Targets

    • Target

      RDP Brute_Cracked.exe

    • Size

      1.7MB

    • MD5

      bd5cd7f77a38e709cb03b8b60cfcc15c

    • SHA1

      ed59b52ea4c63ffd6322bcb43155f2245048a541

    • SHA256

      4f66d0ced260b21359d60081d26c57bdeb3b54a293d084201589019d79379e8e

    • SHA512

      0f5973d3b16362cc2540065188bd3650be6622a8bf3b1bb6e310ec3f395292b916c0b1dd3514497a78efee847da16bf559eb21b3225d80ffb4ded4819a8a4b63

    • SSDEEP

      24576:Cj5yx6uJa4WiXV15W/F4A8A3GpF8EfE1FF1ehGXeRxm8F0EJSoUkgBbt:e59+WaV1J6GpFDEV1eEox10EPEbt

    • 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.

    • Checks computer location settings

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

    • Executes dropped EXE

    • 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 v15

Tasks