Analysis

  • max time kernel
    149s
  • max time network
    135s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10-05-2024 14:35

General

  • Target

    x1TYUNtEO1zz.exe

  • Size

    469KB

  • MD5

    bd8b7958eeae8d1adf54148d23079863

  • SHA1

    5b48f72267da36089181f175b3ea111dc6274377

  • SHA256

    aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4

  • SHA512

    e494a21740da130d0f79dabde3611f78f5e3874cce59aee8203b1218466e58ac1a9e9483324b58a2c6ea4a7f07ced11497103fe393f931bba47956b7b1ed62e8

  • SSDEEP

    12288:Obmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSan9:uiLJbpI7I2WhQqZ7a9

Malware Config

Extracted

Family

remcos

Botnet

Nuevos

C2

nuevosremcs.duckdns.org:9090

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    notepads.exe

  • copy_folder

    data

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    notas

  • mouse_option

    false

  • mutex

    Rmc-LYXPNU

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    system32

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies registry class 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.exe
    "C:\Users\Admin\AppData\Local\Temp\x1TYUNtEO1zz.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:4004
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:4424
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\data\notepads.exe"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1552
        • C:\Users\Admin\AppData\Roaming\data\notepads.exe
          C:\Users\Admin\AppData\Roaming\data\notepads.exe
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of SetWindowsHookEx
          PID:3204

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\ProgramData\notas\logs.dat

    Filesize

    144B

    MD5

    8aef52429755cc7d7019b06917fc54a2

    SHA1

    d49e47426f0003063d46bf2045fd47074a8d5fec

    SHA256

    15dda1d3edfb9a62ae6cb8b424a8ad2a048edab52cdff248d7a25c6ea27a82f0

    SHA512

    7908d292f89f1723424827d76a6bb5453e91b408af2acf0ebe4ccdbdd606fd956c901f545e372c0150050438bb402fd58f7137d2b4e7226b9fd8594b112e7a3e

  • C:\Users\Admin\AppData\Local\Temp\install.vbs

    Filesize

    418B

    MD5

    1653e8468b0d0cd87a484261da3a898b

    SHA1

    ab798bd56e8dfebf82b4feda4e1549778d19848b

    SHA256

    1bf4eaa1b06f079565ca6ea81082736efd1e25d6465c353ad992ba8c38940c3f

    SHA512

    5df77f64350879e22a6b9f018bdd8fcf90920cc9f4026ed9bf733b5e965214abd8c3643b211b2f814cd2a9e016f0c15762eaee133feef6ed5c37bdd66ff7be2f

  • C:\Users\Admin\AppData\Roaming\data\notepads.exe

    Filesize

    469KB

    MD5

    bd8b7958eeae8d1adf54148d23079863

    SHA1

    5b48f72267da36089181f175b3ea111dc6274377

    SHA256

    aa4f91582c090e99b67390b61edf78df4525c6f2125c38a2a0b1a925bbe7fab4

    SHA512

    e494a21740da130d0f79dabde3611f78f5e3874cce59aee8203b1218466e58ac1a9e9483324b58a2c6ea4a7f07ced11497103fe393f931bba47956b7b1ed62e8