FirstTime Seen Account Performing DCSync
editFirstTime Seen Account Performing DCSync
editThis 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:
- https://threathunterplaybook.com/notebooks/windows/06_credential_access/WIN-180815210510.html
- https://threathunterplaybook.com/library/windows/active_directory_replication.html?highlight=dcsync#directory-replication-services-auditing
- https://github.com/SigmaHQ/sigma/blob/master/rules/windows/builtin/security/win_ad_replication_non_machine_account.yml
- https://github.com/atc-project/atomic-threat-coverage/blob/master/Atomic_Threat_Coverage/Logging_Policies/LP_0027_windows_audit_directory_service_access.md
- https://attack.stealthbits.com/privilege-escalation-using-mimikatz-dcsync
- https://www.thehacker.recipes/ad/movement/credentials/dumping/dcsync
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Credential Access
- Active Directory
Version: 1
Rule authors:
- Elastic
Rule license: Elastic License v2
Investigation guide
editRule query
editevent.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
-
Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
-
Technique:
- Name: OS Credential Dumping
- ID: T1003
- Reference URL: https://attack.mitre.org/techniques/T1003/
-
Sub-technique:
- Name: DCSync
- ID: T1003.006
- Reference URL: https://attack.mitre.org/techniques/T1003/006/