General

  • Target
    UltraViewer_setup_6.6.124_en.exe
  • Size 3.5MB
  • Sample261023-e3y7bshw6t
  • SHA256 020aac79a14717e316a593155ca778dd3e253b888bf62633b174838d35df7f41
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Targets

    • Target
      UltraViewer_setup_6.6.124_en.exe
    • Size 3.5MB
    • SHA256 020aac79a14717e316a593155ca778dd3e253b888bf62633b174838d35df7f41
    • MD5 SHA1 SHA512 SSDEEP TLSH
    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

    • Downloads MZ/PE file

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Event Triggered Execution: Component Object Model Hijacking

      Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

    • Executes dropped EXE

    • Loads dropped DLL

    • Stops running service(s)

    • Adds Run key to start application

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Contacts third-party web service commonly abused for C2

      Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Network Share Discovery

      Attempt to gather information on host network.

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • ConfuserEx .NET packer

      Detects ConfuserEx .NET packer.

    • Drops file in System32 directory

    • Probable phishing domain

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

MITRE ATT&CK Enterprise v16

Tasks