General

  • Target
    WindowsUpdateService.exe
  • Size 2.9MB
  • Sample260831-ybd7maac29
  • SHA256 de0f63d516fb70b999c715a8e73ce443466e91ce9c24dddf44a98ba27f2e9441
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Targets

    • Target
      WindowsUpdateService.exe
    • Size 2.9MB
    • SHA256 de0f63d516fb70b999c715a8e73ce443466e91ce9c24dddf44a98ba27f2e9441
    • MD5 SHA1 SHA512 SSDEEP TLSH
    • Contains code to disable Windows Defender

      A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

    • Modifies WinLogon for persistence

    • Modifies Windows Defender DisableAntiSpyware settings

    • Modifies Windows Defender notification settings

    • Modifies security service

    • Deletes shadow copies

      Ransomware often targets backup files to inhibit system recovery.

    • Modifies boot configuration data using bcdedit

    • Blocks application from running via registry modification

      Adds application to list of disallowed applications.

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Disables Task Manager via registry modification

    • Disables one or more Microsoft Defender components

      Uses the Powershell Set-MpPreference cmdlet to disable one or more Microsoft Defender components.

    • Event Triggered Execution: Image File Execution Options Injection

    • Possible privilege escalation attempt

    • Uses Session Manager for persistence

      Creates Session Manager registry key to run executable early in system boot.

    • Disables automatic submission of suspicious files to Microsoft by Windows Defender

      Uses the Powershell Set-MpPreference cmdlet to prevent Windows Defender from automatically sending files to Microsoft for analysis.

    • Disables service(s)

    • Executes dropped EXE

    • Modifies file permissions

    • Windows security modification

    • Checks whether UAC is enabled

    • Drops desktop.ini file(s)

    • Modifies Security services

      Modifies the startup behavior of a security service.

    • Drops file in System32 directory

MITRE ATT&CK Enterprise v16

Tasks