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Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/12/2024, 22:13

General

  • Target

    JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe

  • Size

    124KB

  • MD5

    8b62975c6ddaa41bae24ce12cede46c5

  • SHA1

    fb182a7d0975fe1509ff69caa0f21a2574bb6258

  • SHA256

    88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12

  • SHA512

    e980d7784fac9a5d16ee84930cbc12aa524d774c2bbcd11e2ede8fa5a52232cc98652df842e770c585bc225401c52512e34c1482a8437357e6e224391db5d1ac

  • SSDEEP

    3072:mlh1qaSs6IF9OK4b80S2Van4Va1cpcQjed5OzqhUra:Ch1qn3IF9Obbj/a1cpcQjeHOzqhUr

Malware Config

Extracted

Family

remcos

Version

2.5.0 Pro

Botnet

RemoteHost

C2

91.193.75.145:1604

Attributes
  • audio_folder

    MicRecords

  • audio_path

    %AppData%

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    firefox1.exe

  • copy_folder

    firefox

  • delete_file

    true

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs9.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    Remcos-IVNP1E

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    firefox

  • take_screenshot_option

    false

  • take_screenshot_time

    5

  • take_screenshot_title

    wikipedia;solitaire;

Signatures

  • Modifies WinLogon for persistence 2 TTPs 2 IoCs
  • Remcos

    Remcos is a closed-source remote control and surveillance software.

  • Remcos family
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Modifies WinLogon 2 TTPs 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
    "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Adds Run key to start application
    • Modifies WinLogon
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3532
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      2⤵
      • Checks computer location settings
      • Deletes itself
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2332
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:3804
        • C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe
          C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe
          4⤵
          • Modifies WinLogon for persistence
          • Executes dropped EXE
          • Adds Run key to start application
          • Modifies WinLogon
          • System Location Discovery: System Language Discovery
          • Suspicious use of SetWindowsHookEx
          PID:1592

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\install.vbs

    Filesize

    692B

    MD5

    a86b6d7e80c9b3568ea72832ff512e8a

    SHA1

    9956983e499222955b86255747034251f4e63ed5

    SHA256

    1bce219a4bfa0ba3a2564a8e0b0dd3a176429d3f536119e2aa8264a2365925b8

    SHA512

    99a445ec335844ccc0d2c2a47d56f6bc4c7b2e0368adff62c34233f08e31e881726f1e4c300b4e7c4cde9a3ba81e1cf9f973c580a1b0f9beae5af00fa3e0e1e5

  • C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe

    Filesize

    124KB

    MD5

    8b62975c6ddaa41bae24ce12cede46c5

    SHA1

    fb182a7d0975fe1509ff69caa0f21a2574bb6258

    SHA256

    88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12

    SHA512

    e980d7784fac9a5d16ee84930cbc12aa524d774c2bbcd11e2ede8fa5a52232cc98652df842e770c585bc225401c52512e34c1482a8437357e6e224391db5d1ac

  • C:\Users\Admin\AppData\Roaming\remcos\logs9.dat

    Filesize

    74B

    MD5

    d1d6c6069c471f5ff2df97d866023786

    SHA1

    a0f87526a3c024c15f21ffdc83393ac12fe06bd9

    SHA256

    4eec30926df6eab97aa1e37bd0d26c2bab5c592cbd3e157a4cae60db60c27326

    SHA512

    5adb7deadbc0570274a0cba8497519ff3550b280c7cc95640f0e56893389e30851afe0ae53dbb61be8701eb6c1667d479b71c4cfc645f667f0c6949ec940bb50