Alsid DCSync

Status: available
Severity: high
Time window: 2h
Source: github.com/Azure/Azure-Sentinel

'Searches for DCSync attacks'

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1003.006` OS Credential Dumping: DCSync

Rule body

id: d3c658bd-8da9-4372-82e4-aaffa922f428
name: Alsid DCSync
description: |
    'Searches for DCSync attacks'
severity: High
requiredDataConnectors:
  - connectorId: AlsidForAD
    dataTypes:
      - AlsidForADLog_CL
queryFrequency: 2h
queryPeriod: 2h
triggerOperator: gt
triggerThreshold: 0
status: Available
tactics:
  - CredentialAccess
relevantTechniques:
  - T1003.006
query: |
    afad_parser
    | where MessageType == 2 and Codename == "DCSync"
    | extend HostName = tostring(split(Host, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Host, '.'), 1, -1), '.'))
entityMappings:
  - entityType: Host
    fieldMappings:
      - identifier: HostName
        columnName: HostName
      - identifier: DnsDomain
        columnName: DnsDomain
version: 1.0.1
kind: Scheduled

Stages and Predicates

Stage 1: `source`

afad_parser

Stage 2: `where`

| where MessageType == 2 and Codename == "DCSync"

Stage 3: `extend`

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

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Codename`	eq	`DCSync` corpus 3 (kusto 3)	`field:"Codename" kind:eq value:"DCSync"`
`MessageType`	eq	`2` corpus 21 (kusto 21)	`field:"MessageType" kind:eq value:"2"`

Output fields

These fields are emitted when the rule matches.

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

Alsid DCSync

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`