Potential Exfiltration via Certreq

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Identifies Certreq making an HTTP Post request. Adversaries could abuse Certreq to exfiltrate data to a remote URL.

Rule type: eql

Rule indices:

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

Severity: medium

Risk score: 47

Runs every: 5m

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

Maximum alerts per execution: 100

References:

Tags:

  • Domain: Endpoint
  • OS: Windows
  • Use Case: Threat Detection
  • Tactic: Defense Evasion
  • Tactic: Command and Control
  • Data Source: Elastic Endgame
  • Data Source: Elastic Defend

Version: 4

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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process where host.os.type == "windows" and event.type == "start" and
 (process.name : "CertReq.exe" or process.pe.original_file_name == "CertReq.exe") and process.args : "-Post"

Framework: MITRE ATT&CKTM