Analysis

  • max time kernel
    133s
  • max time network
    140s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    27/10/2022, 08:32

General

  • Target
    0936b7713936d51076fe77b8c8da04e0.exe
  • Size 846KB
  • Sample221027-kfas4sbef3
  • SHA256 0f4d1dbae1cbb430bd201e362d7325a9a462de60d0fa04de4c3ef871de11248d
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • remcos

Version
  • 1.7 Pro

Botnet
  • Oct 25th RDP

C2
  • gcrozonav.duckdns.org:4045

Attributes
  • audio_folder

    audio

  • audio_path

    %AppData%

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    5

  • copy_file

    Microsoft Intel Audio.exe

  • copy_folder

    Audio Microsoft

  • delete_file

    false

  • hide_file

    true

  • hide_keylog_file

    true

  • install_flag

    true

  • install_path

    %WinDir%

  • keylog_crypt

    true

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    Windows Display

  • keylog_path

    %WinDir%

  • mouse_option

    false

  • mutex

    Windows Audio

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screens

  • screenshot_path

    %AppData%

  • screenshot_time

    1

  • startup_value

    Windows Security Check

  • take_screenshot_option

    true

  • take_screenshot_time

    5

  • take_screenshot_title

    Username;password;proforma;invoice;notepad

Signatures

  • Remcos

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

  • UAC bypass 3 TTPs 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies Internet Explorer settings 1 TTPs 29 IoCs
  • Modifies registry key 1 TTPs 2 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 6 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0936b7713936d51076fe77b8c8da04e0.exe
    "C:\Users\Admin\AppData\Local\Temp\0936b7713936d51076fe77b8c8da04e0.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1660
    • C:\Users\Admin\AppData\Local\Temp\0936b7713936d51076fe77b8c8da04e0.exe
      "C:\Users\Admin\AppData\Local\Temp\0936b7713936d51076fe77b8c8da04e0.exe"
      2⤵
      • Adds Run key to start application
      • Drops file in Windows directory
      • Suspicious use of WriteProcessMemory
      PID:1724
      • 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⤵
        • Suspicious use of WriteProcessMemory
        PID:908
        • 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
          • Modifies registry key
          PID:1868
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
        3⤵
        • Loads dropped DLL
        • Suspicious use of WriteProcessMemory
        PID:1996
        • C:\Windows\SysWOW64\PING.EXE
          PING 127.0.0.1 -n 2
          4⤵
          • Runs ping.exe
          PID:972
        • C:\Windows\Audio Microsoft\Microsoft Intel Audio.exe
          "C:\Windows\Audio Microsoft\Microsoft Intel Audio.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:1516
          • C:\Windows\Audio Microsoft\Microsoft Intel Audio.exe
            "C:\Windows\Audio Microsoft\Microsoft Intel Audio.exe"
            5⤵
            • Executes dropped EXE
            • Adds Run key to start application
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:888
            • 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
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:1620
              • 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
                7⤵
                • UAC bypass
                • Modifies registry key
                PID:2016
            • C:\Program Files (x86)\Internet Explorer\iexplore.exe
              "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:748
              • C:\Program Files\Internet Explorer\iexplore.exe
                "C:\Program Files\Internet Explorer\iexplore.exe" http://go.microsoft.com/fwlink/?prd=11324&pver=4.5&sbp=AppLaunch2&plcid=0x409&o1=SHIM_NOVERSION_FOUND&version=(null)&processName=iexplore.exe&platform=0009&osver=5&isServer=0&shimver=4.0.30319.0
                7⤵
                • Modifies Internet Explorer settings
                • Suspicious use of FindShellTrayWindow
                • Suspicious use of SetWindowsHookEx
                PID:1252
                • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
                  "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1252 CREDAT:275457 /prefetch:2
                  8⤵
                  • Modifies Internet Explorer settings
                  • Suspicious use of SetWindowsHookEx
                  PID:576

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        install.bat

        • Path C:\Users\Admin\AppData\Local\Temp\install.bat
        • Size 103B
        • SHA256 da4f86914a168dfb5f1dfed83f88501bc23a80b765e41fcedfe9359619cca772
        • MD5 SHA1 SHA512

        Microsoft Intel Audio.exe

        • Path C:\Windows\Audio Microsoft\Microsoft Intel Audio.exe
        • Size 846KB
        • SHA256 0f4d1dbae1cbb430bd201e362d7325a9a462de60d0fa04de4c3ef871de11248d
        • MD5 SHA1 SHA512 SSDEEP

        Microsoft Intel Audio.exe

        • Path C:\Windows\Audio Microsoft\Microsoft Intel Audio.exe
        • Size 846KB
        • SHA256 0f4d1dbae1cbb430bd201e362d7325a9a462de60d0fa04de4c3ef871de11248d
        • MD5 SHA1 SHA512 SSDEEP

        Microsoft Intel Audio.exe

        • Path C:\Windows\Audio Microsoft\Microsoft Intel Audio.exe
        • Size 846KB
        • SHA256 0f4d1dbae1cbb430bd201e362d7325a9a462de60d0fa04de4c3ef871de11248d
        • MD5 SHA1 SHA512 SSDEEP

        Microsoft Intel Audio.exe

        • Path \Windows\Audio Microsoft\Microsoft Intel Audio.exe
        • Size 846KB
        • SHA256 0f4d1dbae1cbb430bd201e362d7325a9a462de60d0fa04de4c3ef871de11248d
        • MD5 SHA1 SHA512 SSDEEP

        memory/888-99-0x0000000000400000-0x0000000000417000-memory.dmp

        memory/888-96-0x0000000000400000-0x0000000000417000-memory.dmp

        memory/1516-82-0x0000000000300000-0x00000000003DA000-memory.dmp

        memory/1660-59-0x0000000000DE0000-0x0000000000E2E000-memory.dmp

        memory/1660-55-0x0000000075FB1000-0x0000000075FB3000-memory.dmp

        memory/1660-54-0x0000000000E40000-0x0000000000F1A000-memory.dmp

        memory/1660-56-0x0000000000970000-0x0000000000986000-memory.dmp

        memory/1660-57-0x0000000000720000-0x000000000072C000-memory.dmp

        memory/1660-58-0x0000000005320000-0x00000000053A6000-memory.dmp

        memory/1724-75-0x0000000000400000-0x0000000000417000-memory.dmp

        memory/1724-67-0x0000000000400000-0x0000000000417000-memory.dmp

        memory/1724-60-0x0000000000400000-0x0000000000417000-memory.dmp

        memory/1724-61-0x0000000000400000-0x0000000000417000-memory.dmp

        memory/1724-66-0x0000000000400000-0x0000000000417000-memory.dmp

        memory/1724-65-0x0000000000400000-0x0000000000417000-memory.dmp

        memory/1724-63-0x0000000000400000-0x0000000000417000-memory.dmp

        memory/1724-71-0x0000000000400000-0x0000000000417000-memory.dmp