Title:Potential Kerberos Coercion by Spoofing SPNs via DNS Manipulation Status:experimental Description:Detects modifications to DNS records in Active Directory where the Distinguished Name (DN) contains a base64-encoded blob
matching the pattern "1UWhRCAAAAA...BAAAA". This pattern corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure,
commonly used in Kerberos coercion attacks. Adversaries may exploit this to coerce victim systems into authenticating to
attacker-controlled hosts by spoofing SPNs via DNS. It is one of the strong indicators of a Kerberos coercion attack,.
where adversaries manipulate DNS records to spoof Service Principal Names (SPNs) and redirect authentication requests like CVE-2025-33073.
Please investigate the user account that made the changes, as it is likely a low-privileged account that has been compromised.
References: -https://googleprojectzero.blogspot.com/2021/10/using-kerberos-for-authentication-relay.html -https://www.synacktiv.com/publications/ntlm-reflection-is-dead-long-live-ntlm-reflection-an-in-depth-analysis-of-cve-2025 Author: Swachchhanda Shrawan Poudel (Nextron Systems) Date: 2025-06-20 modified:None Tags:
-'attack.collection'
-'attack.credential-access'
-'attack.t1557.003'
-'attack.persistence'
-'attack.privilege-escalation'
Logsource:
product: windows
service: security
definition: By default these events are not logged by default for MicrosoftDNS objects in Active Directory.
To enable detection, configure an AuditRule on the DNS object container with the "CreateChild" permission for the "Everyone" principal.
This can be accomplished using tools such as Set-AuditRule (see https://github.com/OTRF/Set-AuditRule).
