Analysis

  • max time kernel
    148s
  • max time network
    138s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-08-2024 20:51

General

  • Target

    remcos_a.exe

  • Size

    483KB

  • MD5

    3f36f84b4e51cafed0c967c2cc116f8f

  • SHA1

    49df4cd659e4e38d6a841fed8acd6a00d9a98b23

  • SHA256

    b5d4fa666ad01922b1bca3c725a33ed3a269dcb26ea51f59a4cda26a37ccbd9c

  • SHA512

    1b7cc5b652c95664d10084f6bb2727e9f7366c74474b39433a0c14e213d4ff4ce25a2aea1833b987edaa3d2de7a534cda56b21a330ff4aca95a2fa93fcd46877

  • SSDEEP

    6144:wTz+c6KHYBhDc1RGJdv//NkUn+N5Bkf/0TELRvIZPjbsAOZZBAXccrlT4:wTlrYw1RUh3NFn+N5WfIQIjbs/ZB+T4

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

k-peterson.gl.at.ply.gg:64076

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    Windows.exe

  • copy_folder

    Windows

  • delete_file

    false

  • hide_file

    true

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %WinDir%\System32

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-0E62CJ

  • screenshot_crypt

    false

  • screenshot_flag

    true

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • UAC bypass 3 TTPs 3 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 6 IoCs
  • Drops file in System32 directory 3 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 1 IoCs
  • Modifies registry key 1 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 29 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\remcos_a.exe
    "C:\Users\Admin\AppData\Local\Temp\remcos_a.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in System32 directory
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1948
    • C:\Windows\SysWOW64\cmd.exe
      /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:952
      • C:\Windows\SysWOW64\reg.exe
        C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        3⤵
        • UAC bypass
        • System Location Discovery: System Language Discovery
        • Modifies registry key
        PID:800
    • C:\Windows\SysWOW64\Windows\Windows.exe
      "C:\Windows\SysWOW64\Windows\Windows.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of WriteProcessMemory
      PID:4484
      • C:\Windows\SysWOW64\cmd.exe
        /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:448
        • C:\Windows\SysWOW64\reg.exe
          C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
          4⤵
          • UAC bypass
          • System Location Discovery: System Language Discovery
          • Modifies registry key
          PID:3404
      • \??\c:\program files (x86)\internet explorer\iexplore.exe
        "c:\program files (x86)\internet explorer\iexplore.exe"
        3⤵
        • Adds Run key to start application
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:4716
        • C:\Windows\SysWOW64\cmd.exe
          /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
          4⤵
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:2144
          • C:\Windows\SysWOW64\reg.exe
            C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
            5⤵
            • UAC bypass
            • System Location Discovery: System Language Discovery
            • Modifies registry key
            PID:2376
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          4⤵
            PID:3660

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\ProgramData\remcos\logs.dat

      Filesize

      144B

      MD5

      754a3ad70a2d0aadeff6dba25b56c7e1

      SHA1

      7882a2c0c35bc47ea940d26664574c140410c0ce

      SHA256

      2e04a10ab4e5e17f5e5316f8ab156443067060c6179d4bb4094927f0004dda18

      SHA512

      6f7a7ddfe92353b6b9e48dc8a09da459b6304fd4b27f6a48463e2bf4a093bae191f78019e693f3d9df6fb3e16cabede5b148130cd000a161212c65192010040b

    • C:\Windows\SysWOW64\Windows\Windows.exe

      Filesize

      483KB

      MD5

      3f36f84b4e51cafed0c967c2cc116f8f

      SHA1

      49df4cd659e4e38d6a841fed8acd6a00d9a98b23

      SHA256

      b5d4fa666ad01922b1bca3c725a33ed3a269dcb26ea51f59a4cda26a37ccbd9c

      SHA512

      1b7cc5b652c95664d10084f6bb2727e9f7366c74474b39433a0c14e213d4ff4ce25a2aea1833b987edaa3d2de7a534cda56b21a330ff4aca95a2fa93fcd46877

    • memory/3660-44-0x0000000000F30000-0x0000000000FB2000-memory.dmp

      Filesize

      520KB

    • memory/3660-45-0x0000000000F30000-0x0000000000FB2000-memory.dmp

      Filesize

      520KB

    • memory/4716-54-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-33-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-43-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-46-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-35-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-34-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-52-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-53-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-36-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-40-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-60-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-61-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-66-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-67-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-73-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-74-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-79-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-80-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-85-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB

    • memory/4716-87-0x0000000000E20000-0x0000000000EA2000-memory.dmp

      Filesize

      520KB