Analysis

  • max time kernel
    151s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12/10/2022, 04:47

General

  • Target
    2588905afa71212e998ca44aabbebe40.exe
  • Size 975KB
  • Sample221012-fejbmscdg2
  • SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • remcos

Botnet
  • RemoteHost

C2
  • 37.0.14.206:6081

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

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-04LFTW

  • 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.

  • NirSoft MailPassView 2 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 2 IoCs

    Password recovery tool for various web browsers

  • Nirsoft 6 IoCs
  • Executes dropped EXE 6 IoCs
  • Checks computer location settings 2 TTPs 4 IoCs

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

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 8 IoCs
  • Suspicious use of SetThreadContext 5 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 10 IoCs
  • Suspicious behavior: MapViewOfSection 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2588905afa71212e998ca44aabbebe40.exe
    "C:\Users\Admin\AppData\Local\Temp\2588905afa71212e998ca44aabbebe40.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:312
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GXLFiDFJ" /XML "C:\Users\Admin\AppData\Local\Temp\tmpEF03.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:4376
    • C:\Users\Admin\AppData\Local\Temp\2588905afa71212e998ca44aabbebe40.exe
      "{path}"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:1616
      • 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:64
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\Remcos\remcos.exe"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:3636
          • C:\ProgramData\Remcos\remcos.exe
            C:\ProgramData\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:2876
            • C:\Windows\SysWOW64\schtasks.exe
              "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\GXLFiDFJ" /XML "C:\Users\Admin\AppData\Local\Temp\tmpA5C1.tmp"
              6⤵
              • Creates scheduled task(s)
              PID:828
            • C:\ProgramData\Remcos\remcos.exe
              "{path}"
              6⤵
              • Executes dropped EXE
              PID:4232
            • C:\ProgramData\Remcos\remcos.exe
              "{path}"
              6⤵
              • Executes dropped EXE
              • Adds Run key to start application
              • Suspicious use of SetThreadContext
              • Suspicious behavior: MapViewOfSection
              • Suspicious use of SetWindowsHookEx
              • Suspicious use of WriteProcessMemory
              PID:4380
              • C:\ProgramData\Remcos\remcos.exe
                C:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\xxmfecpdjlzxurwhyxsomxazdv"
                7⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                PID:3144
              • C:\ProgramData\Remcos\remcos.exe
                C:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\hzsyfvifxtrkwxklpinqpcnqmbyds"
                7⤵
                • Executes dropped EXE
                • Accesses Microsoft Outlook accounts
                PID:1676
              • C:\ProgramData\Remcos\remcos.exe
                C:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\stxignsykbjpgdgpytzjaohzvqqmtxjl"
                7⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:1512

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        remcos.exe

        • Path C:\ProgramData\Remcos\remcos.exe
        • Size 975KB
        • SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
        • MD5 SHA1 SHA512 SSDEEP

        remcos.exe

        • Path C:\ProgramData\Remcos\remcos.exe
        • Size 975KB
        • SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
        • MD5 SHA1 SHA512 SSDEEP

        remcos.exe

        • Path C:\ProgramData\Remcos\remcos.exe
        • Size 975KB
        • SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
        • MD5 SHA1 SHA512 SSDEEP

        remcos.exe

        • Path C:\ProgramData\Remcos\remcos.exe
        • Size 975KB
        • SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
        • MD5 SHA1 SHA512 SSDEEP

        remcos.exe

        • Path C:\ProgramData\Remcos\remcos.exe
        • Size 975KB
        • SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
        • MD5 SHA1 SHA512 SSDEEP

        remcos.exe

        • Path C:\ProgramData\Remcos\remcos.exe
        • Size 975KB
        • SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
        • MD5 SHA1 SHA512 SSDEEP

        remcos.exe

        • Path C:\ProgramData\Remcos\remcos.exe
        • Size 975KB
        • SHA256 4a9feae7cda6d56de487622e2da600572e03bb3fd0f4efd664d36a47d2bf1086
        • MD5 SHA1 SHA512 SSDEEP

        install.vbs

        • Path C:\Users\Admin\AppData\Local\Temp\install.vbs
        • Size 386B
        • SHA256 6efdc40f9eb217f879607614e928b65bff759e424f3efb31faceb2a043c32dc2
        • MD5 SHA1 SHA512

        tmpA5C1.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\tmpA5C1.tmp
        • Size 1KB
        • SHA256 5ede6e10a8a8bb34f0b69882802a33a6dda22731d12166d3a7a565d779088365
        • MD5 SHA1 SHA512

        tmpEF03.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\tmpEF03.tmp
        • Size 1KB
        • SHA256 5ede6e10a8a8bb34f0b69882802a33a6dda22731d12166d3a7a565d779088365
        • MD5 SHA1 SHA512

        xxmfecpdjlzxurwhyxsomxazdv

        • Path C:\Users\Admin\AppData\Local\Temp\xxmfecpdjlzxurwhyxsomxazdv
        • Size 4KB
        • SHA256 0c9e16830ccc6495def187adde2137ac07a566e1534e5714f626dcd68d28094c
        • MD5 SHA1 SHA512 SSDEEP

        memory/312-132-0x0000000000570000-0x000000000066A000-memory.dmp

        memory/312-136-0x00000000074E0000-0x00000000074EA000-memory.dmp

        memory/312-135-0x0000000007630000-0x00000000076CC000-memory.dmp

        memory/312-134-0x00000000074F0000-0x0000000007582000-memory.dmp

        memory/312-133-0x00000000079C0000-0x0000000007F64000-memory.dmp

        memory/1512-167-0x0000000000400000-0x0000000000424000-memory.dmp

        memory/1512-171-0x0000000000400000-0x0000000000424000-memory.dmp

        memory/1616-142-0x0000000000400000-0x000000000047E000-memory.dmp

        memory/1616-145-0x0000000000400000-0x000000000047E000-memory.dmp

        memory/1616-140-0x0000000000400000-0x000000000047E000-memory.dmp

        memory/1616-141-0x0000000000400000-0x000000000047E000-memory.dmp

        memory/1616-143-0x0000000000400000-0x000000000047E000-memory.dmp

        memory/1676-170-0x0000000000400000-0x0000000000457000-memory.dmp

        memory/1676-169-0x0000000000400000-0x0000000000457000-memory.dmp

        memory/3144-168-0x0000000000400000-0x0000000000478000-memory.dmp

        memory/3144-172-0x0000000000400000-0x0000000000478000-memory.dmp

        memory/4380-158-0x0000000000400000-0x000000000047E000-memory.dmp

        memory/4380-159-0x0000000000400000-0x000000000047E000-memory.dmp

        memory/4380-160-0x0000000000400000-0x000000000047E000-memory.dmp

        memory/4380-174-0x0000000000400000-0x000000000047E000-memory.dmp