A user sent multiple TGT requests to irregular service

Cortex XDR Analytics Alert Reference by Alert name

Product
Cortex XDR
Last date published
2024-06-04
Category
Analytics Alert Reference
Order
Alert name

Synopsis

Activation Period

14 Days

Training Period

30 Days

Test Period

10 Minutes

Deduplication Period

1 Day

Required Data

  • Requires one of the following data sources:
    • Windows Event Collector
      OR
    • XDR Agent
  • Requires:
    • eXtended Threat Hunting (XTH)

Detection Modules

Identity Analytics

ATT&CK Tactic

Credential Access (TA0006)

ATT&CK Technique

Steal or Forge Kerberos Tickets: Kerberoasting (T1558.003)

Severity

Low

Description

A user sent multiple TGT requests to services other than KRBTGT and KADMIN. This is typically a sign of a Kerberoasting attack.

Attacker's Goals

Crack account credentials by obtaining an easy-to-crack Kerberos ticket.

Investigative actions

Check who used the host at the time of the alert, to rule out a benign service or tool requesting weak Kerberos encryption.

Variations

A user sent an excessive number of TGT requests to irregular services

Synopsis

ATT&CK Tactic

Credential Access (TA0006)

ATT&CK Technique

Steal or Forge Kerberos Tickets: Kerberoasting (T1558.003)

Severity

Medium

Description

A user sent multiple TGT requests to services other than KRBTGT and KADMIN. This is typically a sign of a Kerberoasting attack.

Attacker's Goals

Crack account credentials by obtaining an easy-to-crack Kerberos ticket.

Investigative actions

Check who used the host at the time of the alert, to rule out a benign service or tool requesting weak Kerberos encryption.


A user sent a TGT request to irregular service

Synopsis

ATT&CK Tactic

Credential Access (TA0006)

ATT&CK Technique

Steal or Forge Kerberos Tickets: Kerberoasting (T1558.003)

Severity

Informational

Description

A user sent a TGT request to a service other than KRBTGT and KADMIN. This might indicate an attempt to perform a Kerberoasting attack.

Attacker's Goals

Crack account credentials by obtaining an easy-to-crack Kerberos ticket.

Investigative actions

Check who used the host at the time of the alert, to rule out a benign service or tool requesting weak Kerberos encryption.