Rule Info
Name
Attempts of Kerberos Coercion Via DNS SPN Spoofing
Author
Swachchhanda Shrawan Poudel (Nextron Systems)
Description
Detects the presence of "UWhRC....AAYBAAAA" pattern in command line.
The pattern "1UWhRCAAAAA..BAAAA" is a base64-encoded signature that corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure.
Attackers can use this technique to coerce authentication from victim systems to attacker-controlled hosts.
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 in CVE-2025-33073.
If you see this pattern in the command line, it is likely an attempt to add spoofed Service Principal Names (SPNs) to DNS records,
or checking for the presence of such records through the `nslookup` command.
Date
2025-06-20 00:00:00
Modified
None
Id
0ed99dda-6a35-11ef-8c99-0242ac120002
Tags
attack.collection attack.credential-access attack.persistence attack.privilege-escalation attack.t1557.001 attack.t1187
Type
Community Rule
Link to Public Repo
Scan your endpoints, forensic images or collected files with our portable scanner THOR