General

  • Target

    59b2725f7466da2b7426c5d2b64af386c128e313738a0cd5a838a5ec3ca90b5c

  • Size

    2.7MB

  • Sample

    221130-vdm1rsbf5s

  • MD5

    533a8b7d2d523e95e31f517ea0e432de

  • SHA1

    64e003d9c733196f1c1569ee40c64983cc6e4127

  • SHA256

    59b2725f7466da2b7426c5d2b64af386c128e313738a0cd5a838a5ec3ca90b5c

  • SHA512

    b777d95be33e9b9cd5e0f4e5d9c494b83be0f835697bf9b358c7cc93acf6f2ef35f2ac502b9f96030c0262a0c5289d072b0920cd9ea46eea0fa1b4cc59136c4f

  • SSDEEP

    49152:NUF0bDj03kJVsDZj3dE1juUo5XipVmaiDQ2EX8q8bgZvakhJGFLBz8LS:NUFUjmmVsDhNYj/VpVzh2I4S0FLBz8LS

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

RAT

C2

23.105.131.178:7812

Mutex

VNM_MUTEX_gdy9bWxR0te3WgTRnI

Attributes
  • encryption_key

    MDXzdQumRqZGIeya7nG9

  • install_name

    Windows Defender Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    Microsoft

Targets

    • Target

      59b2725f7466da2b7426c5d2b64af386c128e313738a0cd5a838a5ec3ca90b5c

    • Size

      2.7MB

    • MD5

      533a8b7d2d523e95e31f517ea0e432de

    • SHA1

      64e003d9c733196f1c1569ee40c64983cc6e4127

    • SHA256

      59b2725f7466da2b7426c5d2b64af386c128e313738a0cd5a838a5ec3ca90b5c

    • SHA512

      b777d95be33e9b9cd5e0f4e5d9c494b83be0f835697bf9b358c7cc93acf6f2ef35f2ac502b9f96030c0262a0c5289d072b0920cd9ea46eea0fa1b4cc59136c4f

    • SSDEEP

      49152:NUF0bDj03kJVsDZj3dE1juUo5XipVmaiDQ2EX8q8bgZvakhJGFLBz8LS:NUFUjmmVsDhNYj/VpVzh2I4S0FLBz8LS

    • 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.

    • Executes dropped EXE

    • Checks computer location settings

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

    • Deletes itself

    • Loads dropped DLL

    • 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.

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Modify Existing Service

1
T1031

Registry Run Keys / Startup Folder

1
T1060

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Defense Evasion

Modify Registry

4
T1112

Disabling Security Tools

2
T1089

Install Root Certificate

1
T1130

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Tasks