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Elastic Docs ›Elastic Security Solution [7.9] ›Detections and Alerts (beta) ›Prebuilt rule reference

Network Connection via Certutil

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Network Connection via Certutil

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Identifies certutil.exe making a network connection. Adversaries could abuse certutil.exe to download a certificate or malware from a remote URL.

Rule type: query

Rule indices:

  • winlogbeat-*
  • logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

Tags:

  • Elastic
  • Windows

Version: 3 (version history)

Added (Elastic Stack release): 7.7.0

Last modified (Elastic Stack release): 7.9.1

Rule authors: Elastic

Rule license: Elastic License

Rule query

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event.category:network and event.type:connection and
process.name:certutil.exe and not destination.ip:(10.0.0.0/8 or
172.16.0.0/12 or 192.168.0.0/16)

Threat mapping

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Framework: MITRE ATT&CKTM

Rule version history

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Version 3 (7.9.1 release)
  • Formatting only
Version 2 (7.9.0 release)

  • Updated query, changed from:

    process.name:certutil.exe and event.action:"Network connection
detected (rule: NetworkConnect)" and not destination.ip:(10.0.0.0/8 or
172.16.0.0/12 or 192.168.0.0/16)
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