Uncommon Outbound Kerberos Connection
This rule detects uncommon outbound network connections on TCP port 88, which is the default port for Kerberos. Such activity, especially from processes other than expected system services like LSASS or common applications like web browsers and Tomcat, can indicate potential lateral movement or initial privilege escalation attempts through Kerberos delegation. Attackers often leverage Kerberos for authentication in Windows environments to move between systems or elevate privileges, for example, using tools like Rubeus for Kerberoasting or other Kerberos-based attacks.
Sigma
