Elastic Security Detection Rules

Newly Observed RC4 Kerberos Service Ticket Request

Last updated 24 days ago on 2026-08-10
Created a month ago on 2026-08-04

About

Identifies a successful RC4-HMAC Kerberos service ticket request for a requester and service pair that has not been observed during the previous 7 days. A newly observed requester-to-service relationship involving an RC4-encrypted ticket may indicate Kerberoasting.
Tags
Domain: IdentityOS: WindowsUse Case: Threat DetectionTactic: Credential AccessUse Case: Active Directory MonitoringData Source: Active DirectoryData Source: Windows Security Event LogsLanguage: kuery
Severity
medium
Risk Score
47
MITRE ATT&CK™

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

↳ Steal or Forge Kerberos Tickets (T1558)(external, opens in a new tab or window)

False Positive Examples
First-time or infrequent access to legacy services, cross-platform integrations, and inter-domain trust activity may legitimately establish a new requester-to-service relationship using RC4 encryption.
License
Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type
New Terms Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
winlogbeat-*logs-system.security*logs-windows.forwarded*
Related Integrations

system(external, opens in a new tab or window)

windows(external, opens in a new tab or window)

Query
text code block:
host.os.type:windows and event.category:authentication and event.code:4769 and
  winlog.event_data.Status:0x0 and winlog.event_data.TicketEncryptionType:0x17 and
  winlog.event_data.TargetUserName:* and
  winlog.event_data.ServiceName:(* and not (krbtgt or *$)) and
  not (winlog.event_data.TargetUserName:*$@* and source.ip:(127.0.0.0/8 or "::1"))

Install detection rules in Elastic Security

Detect Newly Observed RC4 Kerberos Service Ticket Request 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(external, opens in a new tab or window).