Malicious SharePoint ToolPane Exploitation via SignOut Referer

ATT&CK techniques

Initial Access

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

What it detects

This rule detects HTTP POST requests to ToolPane.aspx carrying a Referer header pointing at SignOut.aspx. This exact request pattern is the authentication bypass used to exploit the SharePoint ToolShell vulnerabilities. The crafted Referer combined with the ToolPane endpoint is a reliable exploitation signature.

Reporting behind it

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Malicious SharePoint ToolPane Exploitation via SignOut Referer

Pivot detection · T1190 · 9 related

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