General

  • Target

    PO#4500550329.xla.xlsx

  • Size

    62KB

  • Sample

    240321-vqtn3scg82

  • MD5

    0a22d957df20069510e9cae834a8a0a3

  • SHA1

    11c23fe16c4e1a3e970b96962c5245d9caca0a38

  • SHA256

    589677c07ed726b2d01ad910b3ac1c459b2ddf585605435d46115fb011d6ad0b

  • SHA512

    f715915f9b5b0a8b0657e2f48406a18baa29c10f7f15b290a6f0daae1ea81854b5147eab9f96111d94f49dcfeba3aeffeb3f130f6597a312b57bf552996660b5

  • SSDEEP

    1536:IX68lJnkk68v/oY7muzg4dRmjB8cUxUAC3kC:IX68Ek68H57Zdyl5/AC

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

107.172.31.178:2404

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

    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-NVSJ5U

  • 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

      PO#4500550329.xla.xlsx

    • Size

      62KB

    • MD5

      0a22d957df20069510e9cae834a8a0a3

    • SHA1

      11c23fe16c4e1a3e970b96962c5245d9caca0a38

    • SHA256

      589677c07ed726b2d01ad910b3ac1c459b2ddf585605435d46115fb011d6ad0b

    • SHA512

      f715915f9b5b0a8b0657e2f48406a18baa29c10f7f15b290a6f0daae1ea81854b5147eab9f96111d94f49dcfeba3aeffeb3f130f6597a312b57bf552996660b5

    • SSDEEP

      1536:IX68lJnkk68v/oY7muzg4dRmjB8cUxUAC3kC:IX68Ek68H57Zdyl5/AC

    • Remcos

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

    • 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