General

  • Target

    MalwareBazaar.1

  • Size

    903KB

  • Sample

    240723-m4w3cstakn

  • MD5

    e34683e560b0c2a5cddcffe98956ea62

  • SHA1

    89a3dc3e4b06a8c4bd94bffc48adac82e620d910

  • SHA256

    f377f9ebb865d686833a830718e6d4eb3898a20e87b0b89e26436c10496c5054

  • SHA512

    4bf4a8fef3b740ba3e6a04bedaaa90970a60b72fc950d53de6e2bf597d89d5d399f9258f9f8088f0ea6304bfa219c5537271c9df59c463893d9589370a27ebff

  • SSDEEP

    24576:7CHszWooWQhqSJgZjY0ZbnC8DOCZs64HE:7CHNtqSEY0ZbntQ64HE

Malware Config

Extracted

Family

remcos

Botnet

2404

C2

107.173.4.16:2404

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    true

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-QBT08L

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Targets

    • Target

      MalwareBazaar.1

    • Size

      903KB

    • MD5

      e34683e560b0c2a5cddcffe98956ea62

    • SHA1

      89a3dc3e4b06a8c4bd94bffc48adac82e620d910

    • SHA256

      f377f9ebb865d686833a830718e6d4eb3898a20e87b0b89e26436c10496c5054

    • SHA512

      4bf4a8fef3b740ba3e6a04bedaaa90970a60b72fc950d53de6e2bf597d89d5d399f9258f9f8088f0ea6304bfa219c5537271c9df59c463893d9589370a27ebff

    • SSDEEP

      24576:7CHszWooWQhqSJgZjY0ZbnC8DOCZs64HE:7CHNtqSEY0ZbntQ64HE

    • Remcos

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

    • Detected Nirsoft tools

      Free utilities often used by attackers which can steal passwords, product keys, etc.

    • NirSoft MailPassView

      Password recovery tool for various email clients

    • NirSoft WebBrowserPassView

      Password recovery tool for various web browsers

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • 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.

    • Accesses Microsoft Outlook accounts

    • Adds Run key to start application

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks