General

  • Target

    https://support.broadcom.com/group/ecx/productdownloads?subfamily=VMware%20Workstation%20Pro

  • Sample

    240630-s63wkstdkl

Malware Config

Targets

    • Target

      https://support.broadcom.com/group/ecx/productdownloads?subfamily=VMware%20Workstation%20Pro

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Looks for VMWare Tools registry key

    • Looks for VMWare drivers on disk

    • Looks for VMWare services registry key.

    • Sets service image path in registry

    • 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

    • 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.

    • Enumerates connected drives

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

    • Writes to the Master Boot Record (MBR)

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

    • Drops file in System32 directory

MITRE ATT&CK Matrix ATT&CK v13

Persistence

Boot or Logon Autostart Execution

2
T1547

Registry Run Keys / Startup Folder

2
T1547.001

Event Triggered Execution

1
T1546

Component Object Model Hijacking

1
T1546.015

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

2
T1547

Registry Run Keys / Startup Folder

2
T1547.001

Event Triggered Execution

1
T1546

Component Object Model Hijacking

1
T1546.015

Defense Evasion

Virtualization/Sandbox Evasion

3
T1497

Modify Registry

4
T1112

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Subvert Trust Controls

1
T1553

Install Root Certificate

1
T1553.004

Discovery

Query Registry

7
T1012

Virtualization/Sandbox Evasion

3
T1497

File and Directory Discovery

1
T1083

System Information Discovery

6
T1082

Peripheral Device Discovery

2
T1120

Tasks