Zerologon Netlogon Privilege Escalation

Darshan Thummar@Mighty

•updated Jun 10, 2026•0•0•6

This rule detects attempts to exploit the Zerologon (CVE-2020-1472) vulnerability, a critical privilege escalation flaw in Microsoft's Netlogon Remote Protocol. It specifically looks for network traffic on TCP port 445 (SMB) containing the 'NetrServerAuthenticate3' function call with a specific sequence of null bytes, which is indicative of an unauthenticated Netlogon session setup without signing and sealing, a key characteristic of the Zerologon exploit.