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General

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

C2

nibiru3.duckdns.org:7777

Mutex

VNM_MUTEX_ubQkq789WptLUo6CNl

Attributes
  • encryption_key

    GaGctuJ4ar1CIDW3hoKN

  • install_name

    Winstep.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Winstep SpeedLaunch

  • subdirectory

    Winstep SpeedLaunch

Targets

    • Contains code to disable Windows Defender

      A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

    • Deletes Windows Defender Definitions

      Uses mpcmdrun utility to delete all AV definitions.

    • Detect Xworm Payload

    • Detect rhadamanthys stealer shellcode

    • Modifies Windows Defender Real-time Protection settings

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • Rhadamanthys

      Rhadamanthys is an info stealer written in C++ first seen in August 2022.

    • VenomRAT

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

    • Xworm

      Xworm is a remote access trojan written in C#.

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Looks for VirtualBox Guest Additions in registry

    • Modifies Windows Firewall

    • Sets service image path in registry

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Obfuscated with Agile.Net obfuscator

      Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

    • Windows security modification

    • Adds Run key to start application

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Drops autorun.inf file

      Malware can abuse Windows Autorun to spread further via attached volumes.

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks