General

  • Target

    b3fa7c61b863e682a33b8f9059dd567a189f339ea94bf5aa96aeb3ab99e0bd5bN.exe

  • Size

    1.0MB

  • Sample

    241220-a7538avrdl

  • MD5

    4dde298c36c37c3f07c7bf65213c2f50

  • SHA1

    c7655d68e8437df0638c8af818830fb767e05872

  • SHA256

    b3fa7c61b863e682a33b8f9059dd567a189f339ea94bf5aa96aeb3ab99e0bd5b

  • SHA512

    6f416bb005ad5df0cdce3125aa2f0eca01e88b8909c0c1695cb369b1b8a3eefeaf3f7c3895b4c1a211e5856bd317e6a9419c10e6f5cb2ffe2869d9ce8e47d170

  • SSDEEP

    12288:SfeDOa9rDeYSorINpj5XqkJD0QrOod7XxlW91RRep+rgRNyA55IxJ2DJW//oK1:xD39v74lfGQrFUspugRNJI2DJW//oe

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

213.183.58.19:4000

Attributes
  • audio_folder

    audio

  • audio_path

    %AppData%

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    5

  • copy_file

    remcos.exe

  • copy_folder

    remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    true

  • install_flag

    false

  • install_path

    %AppData%

  • keylog_crypt

    true

  • keylog_file

    read.dat

  • keylog_flag

    false

  • keylog_folder

    CastC

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    remcos_sccafsoidz

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screens

  • screenshot_path

    %AppData%

  • screenshot_time

    1

  • startup_value

    remcos

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Extracted

Family

remcos

Botnet

Host

C2

213.183.58.19:4000

Attributes
  • audio_folder

    audio

  • audio_path

    %AppData%

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    5

  • copy_file

    remcos.exe

  • copy_folder

    remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    true

  • install_flag

    false

  • install_path

    %AppData%

  • keylog_crypt

    true

  • keylog_file

    read.dat

  • keylog_flag

    false

  • keylog_folder

    CastC

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    remcos_sccafsoidz

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screens

  • screenshot_path

    %AppData%

  • screenshot_time

    1

  • startup_value

    remcos

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Targets

    • Target

      b3fa7c61b863e682a33b8f9059dd567a189f339ea94bf5aa96aeb3ab99e0bd5bN.exe

    • Size

      1.0MB

    • MD5

      4dde298c36c37c3f07c7bf65213c2f50

    • SHA1

      c7655d68e8437df0638c8af818830fb767e05872

    • SHA256

      b3fa7c61b863e682a33b8f9059dd567a189f339ea94bf5aa96aeb3ab99e0bd5b

    • SHA512

      6f416bb005ad5df0cdce3125aa2f0eca01e88b8909c0c1695cb369b1b8a3eefeaf3f7c3895b4c1a211e5856bd317e6a9419c10e6f5cb2ffe2869d9ce8e47d170

    • SSDEEP

      12288:SfeDOa9rDeYSorINpj5XqkJD0QrOod7XxlW91RRep+rgRNyA55IxJ2DJW//oK1:xD39v74lfGQrFUspugRNJI2DJW//oe

    • Remcos

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

    • Remcos family

    • 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.

    • Adds Run key to start application

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks