Elastic Security Detection Rules

Potential Kerberos SPN Spoofing via Suspicious DNS Query

Last updated 10 days ago on 2025-06-14
Created 10 days ago on 2025-06-14

About

Identifies queries to a DNS record containing a base64-encoded blob matching the pattern "UWhRCA...BAAAA". This pattern corresponds to a marshaled CREDENTIAL_TARGET_INFORMATION structure, commonly used in Kerberos coercion attacks. It is associated with tools and techniques that exploit SPN spoofing via DNS. Adversaries may abuse this to coerce victim systems into authenticating to attacker-controlled hosts while requesting Kerberos tickets for legitimate services (often the victim's own identity), enabling attacks such as NTLM reflection.
Tags
Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: Credential AccessData Source: Elastic DefendData Source: Elastic EndgameData Source: CrowdstrikeData Source: SentinelOneData Source: SysmonLanguage: eql
Severity
high
Risk Score
73
MITRE ATT&CK™

Credential Access (TA0006)(opens in a new tab or window)

↳ Adversary-in-the-Middle (T1557)(opens in a new tab or window)

↳ Forced Authentication (T1187)(opens in a new tab or window)

License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
endgame-*logs-crowdstrike.fdr*logs-endpoint.events.network-*logs-sentinel_one_cloud_funnel.*logs-windows.sysmon_operational-*
Related Integrations

endpoint(opens in a new tab or window)

windows(opens in a new tab or window)

sentinel_one_cloud_funnel(opens in a new tab or window)

crowdstrike(opens in a new tab or window)

Query
network where host.os.type == "windows" and dns.question.name : "*UWhRC*BAAAA*"

Install detection rules in Elastic Security

Detect Potential Kerberos SPN Spoofing via Suspicious DNS Query in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).