General

  • Target

    https://www.onlinedown.net/soft/10025163.htm

  • Sample

    230331-kavlbsha36

Malware Config

Targets

    • Target

      https://www.onlinedown.net/soft/10025163.htm

    • Creates new service(s)

    • Downloads MZ/PE file

    • Stops running service(s)

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Registers COM server for autorun

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

    • Checks for any installed AV software in registry

    • 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.

    • Suspicious use of NtSetInformationThreadHideFromDebugger

MITRE ATT&CK Matrix ATT&CK v6

Persistence

New Service

1
T1050

Modify Existing Service

1
T1031

Registry Run Keys / Startup Folder

1
T1060

Bootkit

1
T1067

Privilege Escalation

New Service

1
T1050

Defense Evasion

Impair Defenses

1
T1562

Modify Registry

1
T1112

Discovery

Query Registry

5
T1012

System Information Discovery

5
T1082

Security Software Discovery

1
T1063

Peripheral Device Discovery

2
T1120

Impact

Service Stop

1
T1489

Tasks