IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
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Elastic Docs ›Elastic Security Solution [8.8] ›Downloadable rule update v8.3.3

SSH Authorized Keys File Modification

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SSH Authorized Keys File Modification

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The Secure Shell (SSH) authorized_keys file specifies which users are allowed to log into a server using public key authentication. Adversaries may modify it to maintain persistence on a victim host by adding their own public key(s).

Rule type: query

Rule indices:

  • auditbeat-*
  • logs-endpoint.events.*

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: None

Tags:

  • Elastic
  • Host
  • Linux
  • macOS
  • Threat Detection
  • Persistence

Version: 101

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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event.category:file and event.type:(change or creation) and
 file.name:("authorized_keys" or "authorized_keys2") and
 not process.executable:
             (/Library/Developer/CommandLineTools/usr/bin/git or
              /usr/local/Cellar/maven/*/libexec/bin/mvn or
              /Library/Java/JavaVirtualMachines/jdk*.jdk/Contents/Home/bin/java or
              /usr/bin/vim or
              /usr/local/Cellar/coreutils/*/bin/gcat or
              /usr/bin/bsdtar or
              /usr/bin/nautilus or
              /usr/bin/scp or
              /usr/bin/touch or
              /var/lib/docker/* or
              /usr/bin/google_guest_agent)

Framework: MITRE ATT&CKTM

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