General

  • Target

    .

  • Size

    147KB

  • Sample

    240505-vez2qafc8w

  • MD5

    07c70cb8992bb928beedaef51f415b70

  • SHA1

    989e419cf2535041ea1083cdccbccc15d15082e0

  • SHA256

    91f02f293457b12fde79dddb793c2f1bce044af2ffab70ae67d2fa6e53a79de1

  • SHA512

    f1727d689656dbad05d748e21007f5dfc063e3c8ef3a568f7bb13d328dc23de4b853ebe07de94295ff8f61ec2ee1167b2a6fe5bcb6ff546079e59f371025b824

  • SSDEEP

    1536:ockaad8mvVqeK4DyxRR4Dpll0WlI130vD9328s4DDHhqiS:/k+ml6jUllvI4dHhqiS

Malware Config

Extracted

Family

crimsonrat

C2

185.136.161.124

Targets

    • Target

      .

    • Size

      147KB

    • MD5

      07c70cb8992bb928beedaef51f415b70

    • SHA1

      989e419cf2535041ea1083cdccbccc15d15082e0

    • SHA256

      91f02f293457b12fde79dddb793c2f1bce044af2ffab70ae67d2fa6e53a79de1

    • SHA512

      f1727d689656dbad05d748e21007f5dfc063e3c8ef3a568f7bb13d328dc23de4b853ebe07de94295ff8f61ec2ee1167b2a6fe5bcb6ff546079e59f371025b824

    • SSDEEP

      1536:ockaad8mvVqeK4DyxRR4Dpll0WlI130vD9328s4DDHhqiS:/k+ml6jUllvI4dHhqiS

    • CrimsonRAT main payload

    • CrimsonRat

      Crimson RAT is a malware linked to a Pakistani-linked threat actor.

    • PrivateLoader

      PrivateLoader is a downloader sold as a pay-per-install malware distribution service.

    • Suspicious use of NtCreateProcessExOtherParentProcess

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Modifies Installed Components in the registry

    • Sets file execution options in registry

    • Sets service image path in registry

    • Uses Session Manager for persistence

      Creates Session Manager registry key to run executable early in system boot.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Registers COM server for autorun

    • Windows security modification

    • Adds Run key to start application

    • Checks for any installed AV software in registry

    • Checks installed software on the system

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

    • Checks whether UAC is enabled

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Legitimate hosting services abused for malware hosting/C2

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • Checks system information in the registry

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

    • Drops file in System32 directory

MITRE ATT&CK Enterprise v15

Tasks