Kerberos Coercion Via DNS SPN Spoofing Attempt
Detects the presence of a base64-encoded signature ("UWhRC....AAYBAAAA") in the command line, which corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure. This pattern is a strong indicator of a Kerberos coercion attack, where adversaries manipulate DNS records to spoof Service Principal Names (SPNs) and redirect authentication requests, potentially exploiting vulnerabilities like CVE-2025-33073. The rule aims to identify attempts to add spoofed SPNs to DNS records or check for their presence using commands like `nslookup`.
Sigma
