FirstTime Seen Account Performing DCSync

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This rule identifies when a User Account starts the Active Directory Replication Process for the first time. Attackers can use the DCSync technique to get credential information of individual accounts or the entire domain, thus compromising the entire domain.

Rule type: new_terms

Rule indices:

  • winlogbeat-*
  • logs-system.*
  • logs-windows.*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Credential Access
  • Active Directory

Version: 1

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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event.action : "Directory Service Access" and event.code : "4662" and
 winlog.event_data.Properties : (*DS-Replication-Get-Changes* or *DS-Replication-Get-Changes-All* or *DS-Replication-Get-Changes-In-Filtered-Set* or *1131f6ad-9c07-11d1-f79f-00c04fc2dcd2* or *1131f6aa-9c07-11d1-f79f-00c04fc2dcd2* or *89e95b76-444d-4c62-991a-0facbeda640c*) and
 not winlog.event_data.SubjectUserName : (*$ or MSOL_*)

Framework: MITRE ATT&CKTM