Creation or Modification of Domain Backup DPAPI private keyedit
Identifies the creation or modification of Domain Backup private keys. Adversaries may extract the Data Protection API (DPAPI) domain backup key from a Domain Controller (DC) to be able to decrypt any domain user master key file.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.*
- logs-windows.*
- endgame-*
Severity: high
Risk score: 73
Runs every: 5 minutes
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
- Elastic Endgame
Version: 101 (version history)
Added (Elastic Stack release): 7.10.0
Last modified (Elastic Stack release): 8.6.0
Rule authors: Elastic
Rule license: Elastic License v2
Investigation guideedit
## Triage and analysis Domain DPAPI Backup keys are stored on domain controllers and can be dumped remotely with tools such as Mimikatz. The resulting .pvk private key can be used to decrypt ANY domain user masterkeys, which then can be used to decrypt any secrets protected by those keys.
Rule queryedit
file where event.type != "deletion" and file.name :
("ntds_capi_*.pfx", "ntds_capi_*.pvk")
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
-
Technique:
- Name: Unsecured Credentials
- ID: T1552
- Reference URL: https://attack.mitre.org/techniques/T1552/
Rule version historyedit
- Version 101 (8.6.0 release)
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- Formatting only
- Version 100 (8.5.0 release)
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- Formatting only
- Version 10 (8.4.0 release)
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- Formatting only
- Version 8 (8.3.0 release)
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- Formatting only
- Version 7 (8.2.0 release)
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- Formatting only
- Version 6 (7.16.0 release)
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- Formatting only
- Version 5 (7.13.0 release)
-
-
Updated query, changed from:
event.category:file and not event.type:deletion and file.name:(ntds_capi_*.pfx or ntds_capi_*.pvk)
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- Version 4 (7.12.0 release)
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- Formatting only
- Version 3 (7.11.2 release)
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- Formatting only
- Version 2 (7.11.0 release)
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- Formatting only