Connection to Commonly Abused Free SSL Certificate Providers


Connection to Commonly Abused Free SSL Certificate Providersedit

Identifies unusual processes connecting to domains using known free SSL certificates. Adversaries may employ a known encryption algorithm to conceal command and control traffic.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-windows.*

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


  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Command and Control

Version: 3 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule queryedit

network where network.protocol == "dns" and /* Add new free SSL
certificate provider domains here */ :
("*", "*", "*",
"*") and /* Native Windows process paths that are
unlikely to have network connections to domains secured using free SSL
certificates */ process.executable :
"C:\\Windows\\notepad.exe") and /* Insert noisy false positives
here */ not : ("svchost.exe", "MicrosoftEdge*.exe",

Threat mappingedit


Rule version historyedit

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