Semperis DSP Kerberos krbtgt account with old password

Status: available
Severity: medium
Time window: 1h
Source: github.com/Azure/Azure-Sentinel

'The krbtgt user account is a special (disabled) user account in every Active Directory domain that has a special role in Kerberos function. If this account's password is compromised, Golden Ticket attacks can be performed to get access to any resource in the AD domain. This indicator looks for a krbtgt user account whose password hasn't been changed in the past 180 days. While Microsoft recommends changing the password every year, STIG recommends changing it every 180 days.'

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1558.001` Steal or Forge Kerberos Tickets: Golden Ticket

Rule body

id: 9ff3b26b-7636-412e-ac46-072b084b94cb
name: Semperis DSP Kerberos krbtgt account with old password
description: |
  'The krbtgt user account is a special (disabled) user account in every Active Directory domain that has a special role in Kerberos function. If this account's password is compromised, Golden Ticket attacks can be performed to get access to any resource in the AD domain. This indicator looks for a krbtgt user account whose password hasn't been changed in the past 180 days. While Microsoft recommends changing the password every year, STIG recommends changing it every 180 days.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: SemperisDSP
    dataTypes:
      - dsp_parser
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CredentialAccess
relevantTechniques:
  - T1558.001
query: |
  dsp_parser
  | where EventID == 9212
  | where SecurityIndicatorName == "Kerberos krbtgt account with old password"
  | extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))
entityMappings:
  - entityType: Host
    fieldMappings:
      - identifier: HostName
        columnName: HostName
      - identifier: DnsDomain
        columnName: DnsDomain
version: 2.0.7
kind: Scheduled

Stages and Predicates

Stage 1: `source`

dsp_parser

Stage 2: `where`

| where EventID == 9212

Stage 3: `where`

| where SecurityIndicatorName == "Kerberos krbtgt account with old password"

Stage 4: `extend`

| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`EventID`	eq	`9212`	`field:"EventID" kind:eq value:"9212"`
`SecurityIndicatorName`	eq	`Kerberos krbtgt account with old password`	`field:"SecurityIndicatorName" kind:eq value:"Kerberos krbtgt account with old password"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`DnsDomain`	`extend`
`HostName`	`extend`