General

  • Target
    WindowsSandBox.exe
  • Size 48KB
  • Sample260730-dgnb9sbq6s
  • SHA256 497d005f91b0cce9cfe3c1536cb87a40a0c43f372eecd162bb85cba3994d521e
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • neptunerat

C2
  • viperalza7fgg-63977.portmap.host:63977

Attributes
  • filename

    USB.exe

  • group

    MasonGroup

  • key

    cKY1lhwnkNDQ0qpS

  • rat_name

    MasonRAT

Targets

    • Target
      WindowsSandBox.exe
    • Size 48KB
    • SHA256 497d005f91b0cce9cfe3c1536cb87a40a0c43f372eecd162bb85cba3994d521e
    • MD5 SHA1 SHA512 SSDEEP TLSH
    • Detects NeptuneRAT stealer

    • Family: NeptuneRAT, MasonRAT

      NeptuneRAT aka MasonRAT is a trojan written in C#.

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Sets service image path in registry

      This determines the executable launched when a service starts. It can be used to establish persistence.

    • 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

    • Indicator Removal: Clear Windows Event Logs

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

    • Command and Scripting Interpreter: PowerShell

      Using powershell.exe command.

    • 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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v16

Tasks