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Elastic Docs ›Elastic Security Solution [7.15] ›Detections and alerts ›Prebuilt rule reference

Creation or Modification of Domain Backup DPAPI private key

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Creation or Modification of Domain Backup DPAPI private key

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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.*

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

Version: 5 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 7.13.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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## 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 query

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file where event.type != "deletion" and file.name :
("ntds_capi_*.pfx", "ntds_capi_*.pvk")

Threat mapping

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Framework: MITRE ATT&CKTM

Rule version history

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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)
Version 4 (7.12.0 release)
  • Formatting only
Version 3 (7.11.2 release)
  • Formatting only
Version 2 (7.11.0 release)
  • Formatting only
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