Suspicious PowerShell Spawning .NET LOLBIN (via process_creation)

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1218.004InstallUtil
- T1218.009Regsvcs/Regasm
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects PowerShell spawning uncommon .NET framework utilities used as living-off-the-land execution proxies. The Veil#Drop loader cascaded through these binaries as fallback execution paths for its payload.

Reporting behind it

Related detections9 linkedT1218.009 — drag to rearrange

Suspicious Outbound Connection From CasPol Binary

Suspicious Code Execution via InstallUtil LOLBIN (via process_creation)

Suspicious Service Persistence via InstallUtil with Masqueraded Service Name

Suspicious Assembly Execution via Regasm or Regsvcs From a User Path (via process_creation)

Suspicious CasPol Execution Spawned by PowerShell for Injection

RegAsm.exe Process Execution Missing Command-Line and Assembly Path (Windows)

Windows RegAsm.exe Initiates Network Connection to Public IP

Windows Suspicious Execution of Regasm/Regsvcs With Uncommon Command-Line Extension

Windows Process Execution of Regasm/Regsvcs from Uncommon Directories

Suspicious PowerShell Spawning .NET LOLBIN (via process_creation)

Pivot detection · T1218.009 · 9 related

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

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →