General

  • Target

    https://down.sandai.net/thunder11/XunLeiWebSetup11.2.5.1778dl.exe

  • Sample

    210809-drmf6l73wn

Malware Config

Targets

    • Target

      https://down.sandai.net/thunder11/XunLeiWebSetup11.2.5.1778dl.exe

    • Registers COM server for autorun

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Executes dropped EXE

    • Modifies Windows Firewall

    • Sets DLL path for service in the registry

    • Checks computer location settings

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

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • 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.

    • Installs/modifies Browser Helper Object

      BHOs are DLL modules which act as plugins for Internet Explorer.

    • 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 v6

Persistence

Registry Run Keys / Startup Folder

3
T1060

Modify Existing Service

1
T1031

Browser Extensions

1
T1176

Bootkit

1
T1067

Defense Evasion

Modify Registry

6
T1112

Install Root Certificate

1
T1130

Credential Access

Credentials in Files

1
T1081

Discovery

Query Registry

3
T1012

System Information Discovery

3
T1082

Remote System Discovery

1
T1018

Collection

Data from Local System

1
T1005

Tasks