General

  • Target
    Whyet-4.9.exe
  • Size 20.2MB
  • Sample241229-sefa7stpfx
  • SHA256 38622c32cac325c68f2fbf7148255a9813e7caeb53e3b95ebea56a6da5cb22ba
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Targets

    • Target
      Whyet-4.9.exe
    • Size 20.2MB
    • SHA256 38622c32cac325c68f2fbf7148255a9813e7caeb53e3b95ebea56a6da5cb22ba
    • MD5 SHA1 SHA512 SSDEEP
    • UAC bypass

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Downloads MZ/PE file

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Command and Scripting Interpreter: PowerShell

      Using powershell.exe command.

    • Indicator Removal: File Deletion

      Adversaries may delete files left behind by the actions of their intrusion activity.

    • Writes to the Master Boot Record (MBR)

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

MITRE ATT&CK Enterprise v15

Tasks