General

  • Target

    52b32ac1009f5633f0dee6a2305af7ccdf99c726c4757fa2bca6a0ea212d720f.xlsx

  • Size

    49KB

  • Sample

    240319-cthf4sff2t

  • MD5

    fef0c51aa0af0361b8dec099ed5bafa1

  • SHA1

    94ca3c3802f4d2c28f9ef911821efae63d1d9d33

  • SHA256

    52b32ac1009f5633f0dee6a2305af7ccdf99c726c4757fa2bca6a0ea212d720f

  • SHA512

    53a37c375f74b77da1d77dec9183a204d47b9962ad7c03cfebe8d0a9479b8badf17d24c8a8d2346824f7d63d51a42d09a729af2ebc604197e77946c0d99744e3

  • SSDEEP

    768:yXyBP0/kns9iP95hIlMURQIksJW9TUCV96sIbGLRtdN+/fIFagZHTB6p:yX68/ks9iP9TILWIhJWmFCVjWfIIqTB

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

grinbush.duckdns.org:14645

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

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-XSGZ1O

  • 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

      52b32ac1009f5633f0dee6a2305af7ccdf99c726c4757fa2bca6a0ea212d720f.xlsx

    • Size

      49KB

    • MD5

      fef0c51aa0af0361b8dec099ed5bafa1

    • SHA1

      94ca3c3802f4d2c28f9ef911821efae63d1d9d33

    • SHA256

      52b32ac1009f5633f0dee6a2305af7ccdf99c726c4757fa2bca6a0ea212d720f

    • SHA512

      53a37c375f74b77da1d77dec9183a204d47b9962ad7c03cfebe8d0a9479b8badf17d24c8a8d2346824f7d63d51a42d09a729af2ebc604197e77946c0d99744e3

    • SSDEEP

      768:yXyBP0/kns9iP95hIlMURQIksJW9TUCV96sIbGLRtdN+/fIFagZHTB6p:yX68/ks9iP9TILWIhJWmFCVjWfIIqTB

    • Remcos

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

    • Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003)

    • Detects executables built or packed with MPress PE compressor

    • Detects executables referencing many confidential data stores found in browsers, mail clients, cryptocurreny wallets, etc. Observed in information stealers

    • Detects executables referencing many email and collaboration clients. Observed in information stealers

    • NirSoft MailPassView

      Password recovery tool for various email clients

    • NirSoft WebBrowserPassView

      Password recovery tool for various web browsers

    • Nirsoft

    • Blocklisted process makes network request

    • Abuses OpenXML format to download file from external location

    • 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

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks