General

  • Target
    RuntimeBroker.exe
  • Size 2.8MB
  • Sample261010-v7prfsysfz
  • SHA256 4baf632199b6536dd6f9451794dfc27c3af05a1a5f3eba796611f931710a98aa
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • xworm

Mutex
  • yNحكـX8ٍبAGLWِF6Jo2DiObلٍLZا3ا

Attributes
  • Install_directory

    %Port%

  • install_file

    MicrosoftEdgeUpdateTaskMachineUAC.exe

aes.plain

Extracted

Family
  • neptunerat

C2
  • 82.47.101.109:5000

Attributes
  • filename

    USB.exe

  • group

    MasonGroup

  • key

    OBRPpzjEkVqWqo4O

  • rat_name

    MasonRAT

Targets

    • Target
      RuntimeBroker.exe
    • Size 2.8MB
    • SHA256 4baf632199b6536dd6f9451794dfc27c3af05a1a5f3eba796611f931710a98aa
    • MD5 SHA1 SHA512 SSDEEP TLSH
    • Detect Xworm Payload

    • Detects NeptuneRAT stealer

    • Family: NeptuneRAT, MasonRAT

      NeptuneRAT aka MasonRAT is a trojan written in C#.

    • Family: Xworm

      Xworm is a remote access trojan written in C#.

    • Command and Scripting Interpreter: PowerShell

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

    • Checks computer location settings

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

    • Executes a file named after a Windows system binary

      The file runs from a user directory while carrying the name of an executable that normally only exists in System32.

    • Executes dropped EXE

    • Indicator Removal: Clear Windows Event Logs

      Clear Windows Event Logs to hide the activity of an intrusion.

    • Adds Run key to start application

    • 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 Enterprise v16

Tasks