General

  • Target

    .

  • Size

    147KB

  • Sample

    240510-rh483add32

  • MD5

    3455a5fab8e49aa216d8285e8abeee6b

  • SHA1

    010a55452220fad311eb189b090e3ac0ada2ad9d

  • SHA256

    eb701d9ccdf89c1e37e2c08b2b823614f975d3d0be03cb2a73c3798a4637f307

  • SHA512

    6a2a8aadc7a817a097f929dd758110475ffb65d788d0e7854d3f15f142ff08d98bbae80ae8edceac2f2380d3791707a9b615e8061ebaed2927dde0c65c0f8bbe

  • SSDEEP

    1536:o6kaad8mvVuCK4Dy1jR4Dllls4PeT30vD932Us4DjHhqiS:lk+m3698ll1gwdHhqiS

Malware Config

Extracted

Family

crimsonrat

C2

185.136.161.124

Targets

    • Target

      .

    • Size

      147KB

    • MD5

      3455a5fab8e49aa216d8285e8abeee6b

    • SHA1

      010a55452220fad311eb189b090e3ac0ada2ad9d

    • SHA256

      eb701d9ccdf89c1e37e2c08b2b823614f975d3d0be03cb2a73c3798a4637f307

    • SHA512

      6a2a8aadc7a817a097f929dd758110475ffb65d788d0e7854d3f15f142ff08d98bbae80ae8edceac2f2380d3791707a9b615e8061ebaed2927dde0c65c0f8bbe

    • SSDEEP

      1536:o6kaad8mvVuCK4Dy1jR4Dllls4PeT30vD932Us4DjHhqiS:lk+m3698ll1gwdHhqiS

    • CrimsonRAT main payload

    • CrimsonRat

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

    • Suspicious use of NtCreateProcessExOtherParentProcess

    • Modifies boot configuration data using bcdedit

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Modifies Installed Components in the registry

    • Office macro that triggers on suspicious action

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

    • Sets service image path in registry

    • Checks computer location settings

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

    • 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.

    • 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