THIS IS A EXPERIMENTAL DETECTION
This detection has been marked experimental by the Splunk Threat Research team. This means we have not been able to test, simulate, or build datasets for this detection. Use at your own risk. This analytic is NOT supported.
This search looks for evidence of Active Directory replication traffic [MS-DRSR] from unexpected sources. This traffic is often seen exclusively between Domain Controllers for AD database replication. Any detections from non-domain controller source to a domain controller may indicate the usage of DCSync or DCShadow credential dumping techniques.
- Type: TTP
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Network_Traffic
- Last Updated: 2022-11-26
- Author: Steven Dick
- ID: c6e24183-a5f4-4b2a-ad01-2eb456d09b67
Kill Chain Phase
- CIS 13
1 2 3 4 5 6 | tstats `security_content_summariesonly` count values(All_Traffic.transport) as transport values(All_Traffic.user) as user values(All_Traffic.src_category) as src_category values(All_Traffic.dest_category) as dest_category min(_time) as firstTime max(_time) as lastTime from datamodel=Network_Traffic where All_Traffic.app IN ("ms-dc-replication","*drsr*","ad drs") by All_Traffic.src All_Traffic.dest All_Traffic.app | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `drop_dm_object_name("All_Traffic")` | `windows_ad_replication_service_traffic_filter`
The SPL above uses the following Macros:
windows_ad_replication_service_traffic_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
To successfully implement this search, you need to be ingesting application aware firewall or proxy logs into the Network Datamodel. Categorize all known domain controller Assets servers with an appropriate category for filtering.
Known False Positives
New domain controllers or certian scripts run by administrators.
Associated Analytic Story
|100.0||100||100||Active Directory Replication Traffic from Unknown Source - $src$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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