OS Credential Dumping: DCSync T1003.006
Tactic: Credential Access
Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interface (API) to simulate the replication process from a remote domain controller using a technique called DCSync.
Events covered
15 catalog events are tagged with this technique by at least one rule.
Authoring guide
Patterns shared across the 26 rules above: which fields they filter on, what specific values they look for, and what they exclude. The catalog normalizes field names across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.
Fields filtered most (37 distinct)
The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.
Top indicator values (471 distinct)
Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique. Click a value to expand the rules under this technique that use it.
Exclusions (16 distinct)
Field/operator/value combinations excluded by rules under this technique (top-level not() clauses), sorted by how many rules exclude each. These are the false-positive paths the community has learned to filter out. A new rule that ignores the high-count entries here will likely fire on the same noisy paths. Click a value to expand the rules under this technique that exclude it.
Rules under this technique
Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.
Sigma 10 rules
- Active Directory Replication from Non Machine Account
- Credential Dumping Tools Service Execution - Security
- Credential Dumping Tools Service Execution - System
- Exchange group membership change to perform DCsync attack
- HackTool - Mimikatz Execution
- Mimikatz DC Sync
- Mimikatz Use
- NetSYnc attack
- Replication privileges accessed to perform DCSync attack
- Suspicious Get-ADReplAccount
Elastic 5 rules
- First Time Seen Account Performing DCSync
- Potential Active Directory Replication Account Backdoor
- Potential Credential Access via DCSync
- Potential Invoke-Mimikatz PowerShell Script
- Potential PowerShell HackTool Script by Function Names
Splunk 7 rules
- Excessive DRSGetNCChanges Requests (Windows Event Log)
- Mimikatz (Sysmon)
- Mimikatz (Windows Event Log)
- Potential DCSync (Windows Event Log)
- Windows AD Replication Request Initiated by User Account
- Windows AD Replication Request Initiated from Unsanctioned Location
- Windows AD Replication Service Traffic