A Zeek detection package for CVE-2020-1472, also known as Zerologon, which is a CVSS 10.0 privilege escalation vulnerability against the Netlogon protocol for Windows Server domain controllers.

By default, both notices are raised:

• Zerologon_Attempt indicates the requisite number of login attempts were made within a short period of time.
• Zerologon_Password_Change indicates the above, and a successful password change occurred.

By redefing notice_on_exploit_only to T in cluster.zeek, only the Zerologon_Password_Change notice will be generated.

• Tested on Zeek versions 3.3.0-dev.53-debug and 3.2.0, and Corelight Sensor v19. It should work with Zeek 3.0 and higher.
• This package will run in both clustered and non-clustered environments.
• Developed against the included attack PCAPs.

• https://www.secura.com/blog/zero-logon
• https://www.secura.com/pathtoimg.php?id=2055
• https://support.microsoft.com/en-us/help/4557222/how-to-manage-the-changes-in-netlogon-secure-channel-connections-assoc
• https://corelight.blog/2020/09/16/detecting-zerologon-cve-2020-1472-with-zeek/