Possible SharePoint ToolShell Exploitation via ToolPane POST with 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 the SharePoint ToolPane.aspx endpoint carrying a Referer header pointing to the SignOut page. Microsoft identified this request signature as the ToolShell exploit chain against on-premises SharePoint. The crafted Referer bypasses authentication to reach the vulnerable endpoint, so this combination indicates active exploitation.

Reporting behind it

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Possible SharePoint ToolShell Exploitation via ToolPane POST with SignOut Referer

Pivot detection · T1190 · 9 related

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