Possible ToolShell SharePoint Exploitation via ToolPane.aspx (via webserver)

ATT&CK techniques

Initial Access → Defense Evasion

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
Priv Esc
Defense Evasion
- T1211Exploitation for Stealth
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects POST requests to the SharePoint ToolPane.aspx endpoint carrying the crafted parameters and SignOut.aspx referer used in the ToolShell exploit chain. ToolShell abused a set of SharePoint vulnerabilities to reach unauthenticated remote code execution on internet-facing servers. This request pattern is an early indicator of exploitation before any implant is dropped.

Reporting behind it

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Possible ToolShell SharePoint Exploitation via ToolPane.aspx (via webserver)

Pivot detection · T1190 · 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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