General

  • Target
    c43ca8d4db6d919255a551797c7f01e75d8272fc8a2881bae204952091e79cccN.exe
  • Size 4.9MB
  • Sample241216-bk9csswmht
  • SHA256 c43ca8d4db6d919255a551797c7f01e75d8272fc8a2881bae204952091e79ccc
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • colibri

Version
  • 1.2.0

Botnet
  • Build1

C2
  • http://zpltcmgodhvvedxtfcygvbgjkvgvcguygytfigj.cc/gate.php

  • http://yugyuvyugguitgyuigtfyutdtoghghbbgyv.cx/gate.php

rc4.plain

Targets

    • Target
      c43ca8d4db6d919255a551797c7f01e75d8272fc8a2881bae204952091e79cccN.exe
    • Size 4.9MB
    • SHA256 c43ca8d4db6d919255a551797c7f01e75d8272fc8a2881bae204952091e79ccc
    • MD5 SHA1 SHA512 SSDEEP
    • Colibri Loader

      A loader sold as MaaS first seen in August 2021.

    • Colibri family

    • DcRat

      DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

    • Dcrat family

    • Process spawned unexpected child process

      This typically indicates the parent process was compromised via an exploit or macro.

    • UAC bypass

    • DCRat payload

      Detects payload of DCRat, commonly dropped by NSIS installers.

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Checks whether UAC is enabled

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks