DHCP Callout DLL Installation for Persistence and Privilege Escalation

SigmaHQ Detections@sigmaHQ

•updated Oct 23, 2025•0•14

This rule detects modifications to the Windows Registry keys responsible for DHCP server Callout DLLs. Attackers can leverage this mechanism to install malicious DLLs that execute in the context of the DHCP server, leading to privilege escalation, persistence, and defense evasion. The rule specifically looks for changes to the 'CalloutDlls' and 'CalloutEnabled' values under the 'HKLM\SYSTEM\CurrentControlSet\Services\DHCPServer\Parameters' path.