Malicious Silver Fox BYOVD Vulnerable Driver Service Creation

ATT&CK techniques

Persistence → Priv Esc

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1543.003Windows Service
Priv Esc
- T1543.003Windows Service
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects creation of the kernel service entries named Termaintor or Amsdk_Service that the Silver Fox APT registers to load the vulnerable amsdk.sys driver in a bring-your-own-vulnerable-driver attack. The driver is abused via IOCTL 0x80002048 to terminate security product processes, so these service names indicate an in-progress endpoint-defense-disabling operation preceding ValleyRAT injection.

Reporting behind it

Related detections9 linkedT1543.003 — drag to rearrange

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Malicious Service Permissions Hijacked for Privileges Abuse - Service (via process_creation)

Malicious Service Abuse with Backdoored "command Failure" - Service (via process_creation)

Malicious Service Permissions Hijacked for Privileges Abuse - Reg via Command (via process_creation)

Malicious Mimikatz Driver Registration - Reg via Sysmon (via registry_event)

Suspicious PSexec Service Installation (via security)

Malicious Silver Fox BYOVD Vulnerable Driver Service Creation

Pivot detection · T1543.003 · 9 related

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