Potential Persistence Through Run Control Detected

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Potential Persistence Through Run Control Detected

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This rule monitors the creation/alteration of the rc.local file by a previously unknown process executable through the use of the new terms rule type. The /etc/rc.local file is used to start custom applications, services, scripts or commands during start-up. The rc.local file has mostly been replaced by Systemd. However, through the "systemd-rc-local-generator", rc.local files can be converted to services that run at boot. Adversaries may alter rc.local to execute malicious code at start-up, and gain persistence onto the system.

Rule type: new_terms

Rule indices:

  • logs-endpoint.events.*
  • auditbeat-*
  • 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: Linux
  • Use Case: Threat Detection
  • Tactic: Persistence
  • Data Source: Elastic Endgame

Version: 103

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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host.os.type : "linux" and event.category : "file" and
event.type : ("change" or "file_modify_event" or "creation" or "file_create_event") and
file.path : "/etc/rc.local" and not file.extension : "swp"

Framework: MITRE ATT&CKTM