Suspicious BadIIS Service Persistence Masquerading as System Services

ATT&CK techniques

Persistence → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1543.003Windows Service
Priv Esc
- T1543.003Windows Service
Defense Evasion
- T1036.004Masquerade Task or Service
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects creation of Windows services under the BadIIS masquerading names Winlogin, FaxService or AudiosService, which imitate legitimate system service names through subtle misspellings. The commodity BadIIS ecosystem installs services under these deceptive names to persist and blend into service inventories. Creation of a service with these typo-squatted names indicates BadIIS persistence.

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 BadIIS Service Persistence Masquerading as System Services

Pivot detection · T1543.003 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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