Suspicious IIS Worker Process Spawning Command or Scripting Interpreter via SharePoint ToolShell Exploitation (via process_creation)

ATT&CK techniques

Execution → Persistence

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
- T1505.003Web Shell
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects the SharePoint IIS worker process w3wp spawning command shells or scripting interpreters, behavior observed during ToolShell webshell activity where attackers run commands and decode payloads through the web server process.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

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Malicious Metasploit Stager Delivery via mshta Remote HTA (via process_creation)

Suspicious PowerShell Download of Disguised Payload to ProgramData

Suspicious IIS Worker Process Spawning Command or Scripting Interpreter via SharePoint ToolShell Exploitation (via process_creation)

Pivot detection · T1059.001 · 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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