Possible Kerberoasting without SPNs

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

N/A (single event)

Deduplication Period

1 Day

Required Data

  • Requires one of the following data sources:
    • Palo Alto Networks Platform Logs
      OR
    • XDR Agent

Detection Modules

ATT&CK Tactic

Credential Access (TA0006)

ATT&CK Technique

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

Severity

Low

Description

A user specifically requested weak and deprecated encryption in a Kerberos TGS request.
This provides easy-to-crack hashes, and is typically a sign of a Kerberoasting attack.
The requested service was specified by using a suspicious SPN type, which is often used by Kerberoasting tools to request by SAN instead of SPN.

Attacker's Goals

Crack service 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

Possible Kerberoasting without SPNs on a sensitive server

Synopsis

ATT&CK Tactic

Credential Access (TA0006)

ATT&CK Technique

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

Severity

Medium

Description

A user specifically requested weak and deprecated encryption in a Kerberos TGS request.
This provides easy-to-crack hashes, and is typically a sign of a Kerberoasting attack.
The requested service was specified by using a suspicious SPN type, which is often used by Kerberoasting tools to request by SAN instead of SPN.

Attacker's Goals

Crack service 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.