Suspicious Named Pipe Access for Authentication Coercion (via pipe_created)

ATT&CK techniques

Cred Access → Collection

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1187Forced Authentication
- T1557.001Name Resolution Poisoning and SMB Relay
Discovery
Lateral Movement
Collection
- T1557.001Name Resolution Poisoning and SMB Relay
C2
Exfiltration
Impact

What it detects

This rule detects access to the RPC named pipes abused by authentication coercion techniques such as PetitPotam and PrinterBug to force a target into authenticating to an attacker-controlled server. The spoolss, efsrpc, and eventlog pipes expose dangerous opnums that trigger outbound NTLM authentication. Detecting connections to these pipes surfaces coercion attempts that feed NTLM relay and privilege escalation.

Reporting behind it

Related detections9 linkedT1187 — drag to rearrange

Possible PetitPotam Coercion via IPC$ Named Pipe Access (via security)

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Zeek DNS detects base64 credential target pattern consistent with Kerberos DNS object spoofing

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Zeek DCE/RPC efs* Operations Indicative of EFS Remote Protocol Use

Malicious Anonymous NTLM Network Logon (via security)

Suspicious Outlook Outbound Connection to SMB or HTTP Port

Suspicious LLMNR and NBT-NS Poisoning Tooling via ALPHA SPIDER (via process_creation)

Possible Progress WhatsUp Gold Path Traversal and UNC Coercion via core API (via webserver)

Suspicious Named Pipe Access for Authentication Coercion (via pipe_created)

Pivot detection · T1187 · 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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