General

  • Target

    c35b7a09b11fde91e3e665b53f63b1843b8e91bcd361614c7cc14e9be3cd31f2

  • Size

    1.5MB

  • Sample

    250105-f2a9jssrb1

  • MD5

    bb057a39731b995515ae1fb31aab8997

  • SHA1

    c818a0e6f6d492c53956b56a0021b4e7ceeac969

  • SHA256

    c35b7a09b11fde91e3e665b53f63b1843b8e91bcd361614c7cc14e9be3cd31f2

  • SHA512

    d727bf1e6dd02b9779072444ebec0fa6b4f98251b09541431bc13710b1ec60764412d5ffd892a11adf82b2e62af302dfd05fc57d2b1e702b5d0fdebfc817ad66

  • SSDEEP

    24576:6D39dlfGQrFUspugRNJI2DJnUw9W/j+BeKJlO/a:6F+QrFUBgq25eKX

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

      c35b7a09b11fde91e3e665b53f63b1843b8e91bcd361614c7cc14e9be3cd31f2

    • Size

      1.5MB

    • MD5

      bb057a39731b995515ae1fb31aab8997

    • SHA1

      c818a0e6f6d492c53956b56a0021b4e7ceeac969

    • SHA256

      c35b7a09b11fde91e3e665b53f63b1843b8e91bcd361614c7cc14e9be3cd31f2

    • SHA512

      d727bf1e6dd02b9779072444ebec0fa6b4f98251b09541431bc13710b1ec60764412d5ffd892a11adf82b2e62af302dfd05fc57d2b1e702b5d0fdebfc817ad66

    • SSDEEP

      24576:6D39dlfGQrFUspugRNJI2DJnUw9W/j+BeKJlO/a:6F+QrFUBgq25eKX

    • 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