General

  • Target

    .

  • Size

    147KB

  • Sample

    240514-r7pjxabe3t

  • MD5

    ae16c0e6b3a18a28bf0a0974f1622568

  • SHA1

    106a2deebd06e2931be677b09d4f818d68c76d74

  • SHA256

    b941e34ee71c1eb4c2bb473adc99c62643c9be13bb6c67b0aa3308d61cbdbddd

  • SHA512

    407ac0936b5e5890c6e4f213e410cdb3fda8efec318128de1b3068b7626cd144ba27ee2ce7c381a6013760bd5964ee4c9e321251d50e6c3b94c7b24d80d63867

  • SSDEEP

    1536:olkud8TPV9vK4DNvGR4Dbll1qKf+30vD932Os4DjHhqiS:2kPT3V+CllQHKNHhqiS

Malware Config

Extracted

Family

crimsonrat

C2

185.136.161.124

Targets

    • Target

      .

    • Size

      147KB

    • MD5

      ae16c0e6b3a18a28bf0a0974f1622568

    • SHA1

      106a2deebd06e2931be677b09d4f818d68c76d74

    • SHA256

      b941e34ee71c1eb4c2bb473adc99c62643c9be13bb6c67b0aa3308d61cbdbddd

    • SHA512

      407ac0936b5e5890c6e4f213e410cdb3fda8efec318128de1b3068b7626cd144ba27ee2ce7c381a6013760bd5964ee4c9e321251d50e6c3b94c7b24d80d63867

    • SSDEEP

      1536:olkud8TPV9vK4DNvGR4Dbll1qKf+30vD932Os4DjHhqiS:2kPT3V+CllQHKNHhqiS

    • CrimsonRAT main payload

    • CrimsonRat

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

    • Darkcomet

      DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.

    • Modifies WinLogon for persistence

    • njRAT/Bladabindi

      Widely used RAT written in .NET.

    • Modifies boot configuration data using bcdedit

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Modifies Installed Components in the registry

    • Modifies Windows Firewall

    • Office macro that triggers on suspicious action

      Office document macro which triggers in special circumstances - often malicious.

    • Sets file to hidden

      Modifies file attributes to stop it showing in Explorer etc.

    • Sets service image path in registry

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies system executable filetype association

    • Reads user/profile data of web browsers

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

    • Registers COM server for autorun

    • Unexpected DNS network traffic destination

      Network traffic to other servers than the configured DNS servers was detected on the DNS port.

    • 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

    • Drops desktop.ini file(s)

    • 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.

    • Drops file in System32 directory

MITRE ATT&CK Enterprise v15

Tasks