Analysis

  • max time kernel
    150s
  • max time network
    127s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/01/2023, 07:32

General

  • Target
    SecuriteInfo.com.Win32.RATX-gen.25621.22051.exe
  • Size 928KB
  • Sample230111-jc11fsbd66
  • SHA256 abe27f90a49a7e563fc39eb1e0da5c0327e490aefe6638fa4dfa50fea16c42d2
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • remcos

Botnet
  • RemoteHost

C2
  • brremcoz1.ddns.net:3270

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

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-GF6GEY

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    Remcos

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Executes dropped EXE 3 IoCs
  • Checks computer location settings 2 TTPs 4 IoCs

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

  • Adds Run key to start application 2 TTPs 8 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 48 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.RATX-gen.25621.22051.exe
    "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.RATX-gen.25621.22051.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4912
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\jKNdcTqQC.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1908
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\jKNdcTqQC" /XML "C:\Users\Admin\AppData\Local\Temp\tmp3539.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:2232
    • C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.RATX-gen.25621.22051.exe
      "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.RATX-gen.25621.22051.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:3988
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
        3⤵
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:3132
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:4328
          • C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
            C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
            5⤵
            • Executes dropped EXE
            • Checks computer location settings
            • Suspicious use of SetThreadContext
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:4536
            • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
              "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\jKNdcTqQC.exe"
              6⤵
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:884
            • C:\Windows\SysWOW64\schtasks.exe
              "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\jKNdcTqQC" /XML "C:\Users\Admin\AppData\Local\Temp\tmpDA14.tmp"
              6⤵
              • Creates scheduled task(s)
              PID:3000
            • C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
              "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
              6⤵
              • Executes dropped EXE
              PID:2708
            • C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
              "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
              6⤵
              • Executes dropped EXE
              • Adds Run key to start application
              • Suspicious use of SetWindowsHookEx
              PID:432

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        powershell.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
        • Size 2KB
        • SHA256 92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a
        • MD5 SHA1 SHA512

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 18KB
        • SHA256 26949101f19c28ede2f3c8380a4f3d106faee380ddabd2df7dc2cb8062196749
        • MD5 SHA1 SHA512 SSDEEP

        install.vbs

        • Path C:\Users\Admin\AppData\Local\Temp\install.vbs
        • Size 418B
        • SHA256 fa20e9aab03dc8e9f1910aaf0cf42662379fa16ae3a22642084fb97fa3d4f83a
        • MD5 SHA1 SHA512

        tmp3539.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\tmp3539.tmp
        • Size 1KB
        • SHA256 b31a37f1f6f94bc59520ac310d660d22e1d707e6e755d2013aa47b2c92ff18b7
        • MD5 SHA1 SHA512

        tmpDA14.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\tmpDA14.tmp
        • Size 1KB
        • SHA256 b31a37f1f6f94bc59520ac310d660d22e1d707e6e755d2013aa47b2c92ff18b7
        • MD5 SHA1 SHA512

        remcos.exe

        • Path C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        • Size 928KB
        • SHA256 abe27f90a49a7e563fc39eb1e0da5c0327e490aefe6638fa4dfa50fea16c42d2
        • MD5 SHA1 SHA512 SSDEEP

        remcos.exe

        • Path C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        • Size 928KB
        • SHA256 abe27f90a49a7e563fc39eb1e0da5c0327e490aefe6638fa4dfa50fea16c42d2
        • MD5 SHA1 SHA512 SSDEEP

        remcos.exe

        • Path C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        • Size 928KB
        • SHA256 abe27f90a49a7e563fc39eb1e0da5c0327e490aefe6638fa4dfa50fea16c42d2
        • MD5 SHA1 SHA512 SSDEEP

        remcos.exe

        • Path C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
        • Size 928KB
        • SHA256 abe27f90a49a7e563fc39eb1e0da5c0327e490aefe6638fa4dfa50fea16c42d2
        • MD5 SHA1 SHA512 SSDEEP

        memory/432-179-0x0000000000400000-0x000000000047F000-memory.dmp

        memory/432-178-0x0000000000400000-0x000000000047F000-memory.dmp

        memory/432-181-0x0000000000400000-0x000000000047F000-memory.dmp

        memory/432-182-0x0000000000400000-0x000000000047F000-memory.dmp

        memory/884-180-0x0000000071C60000-0x0000000071CAC000-memory.dmp

        memory/1908-167-0x0000000007850000-0x0000000007858000-memory.dmp

        memory/1908-165-0x0000000007760000-0x000000000776E000-memory.dmp

        memory/1908-139-0x0000000002920000-0x0000000002956000-memory.dmp

        memory/1908-148-0x0000000005BB0000-0x0000000005C16000-memory.dmp

        memory/1908-153-0x0000000006210000-0x000000000622E000-memory.dmp

        memory/1908-141-0x0000000005360000-0x0000000005988000-memory.dmp

        memory/1908-166-0x0000000007870000-0x000000000788A000-memory.dmp

        memory/1908-147-0x0000000005B40000-0x0000000005BA6000-memory.dmp

        memory/1908-146-0x0000000005250000-0x0000000005272000-memory.dmp

        memory/1908-158-0x00000000071C0000-0x00000000071F2000-memory.dmp

        memory/1908-159-0x0000000071330000-0x000000007137C000-memory.dmp

        memory/1908-160-0x00000000067D0000-0x00000000067EE000-memory.dmp

        memory/1908-161-0x0000000007B70000-0x00000000081EA000-memory.dmp

        memory/1908-162-0x0000000007520000-0x000000000753A000-memory.dmp

        memory/1908-163-0x0000000007590000-0x000000000759A000-memory.dmp

        memory/1908-164-0x00000000077B0000-0x0000000007846000-memory.dmp

        memory/3988-144-0x0000000000400000-0x000000000047F000-memory.dmp

        memory/3988-143-0x0000000000400000-0x000000000047F000-memory.dmp

        memory/3988-145-0x0000000000400000-0x000000000047F000-memory.dmp

        memory/3988-151-0x0000000000400000-0x000000000047F000-memory.dmp

        memory/3988-149-0x0000000000400000-0x000000000047F000-memory.dmp

        memory/4912-132-0x0000000000420000-0x000000000050C000-memory.dmp

        memory/4912-136-0x0000000008890000-0x000000000892C000-memory.dmp

        memory/4912-135-0x0000000005050000-0x000000000505A000-memory.dmp

        memory/4912-134-0x0000000004EB0000-0x0000000004F42000-memory.dmp

        memory/4912-133-0x0000000005460000-0x0000000005A04000-memory.dmp