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Elastic Docs ›Elastic Security Solution [8.8] ›Detections and alerts ›Prebuilt rule reference

Suspicious System Commands Executed by Previously Unknown Executable

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Suspicious System Commands Executed by Previously Unknown Executable

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This rule monitors for the execution of several commonly used system commands executed by a previously unknown executable located in commonly abused directories. An alert from this rule can indicate the presence of potentially malicious activity, such as the execution of unauthorized or suspicious processes attempting to run malicious code. Detecting and investigating such behavior can help identify and mitigate potential security threats, protecting the system and its data from potential compromise.

Rule type: new_terms

Rule indices:

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

Severity: low

Risk score: 21

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:

  • Domain: Endpoint
  • OS: Linux
  • Use Case: Threat Detection
  • Tactic: Execution
  • Data Source: Elastic Endgame
  • Data Source: Elastic Defend

Version: 104

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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host.os.type:linux and event.category:process and event.action:(exec or exec_event or fork or fork_event) and
process.executable:(
  /bin/* or /usr/bin/* or /usr/share/* or /tmp/* or /var/tmp/* or /dev/shm/* or
  /etc/init.d/* or /etc/rc*.d/* or /etc/crontab or /etc/cron.*/* or /etc/update-motd.d/* or
  /usr/lib/update-notifier/* or /home/*/.* or /boot/* or /srv/* or /run/*)
  and process.args:(whoami or id or hostname or uptime or top or ifconfig or netstat or route or ps or pwd or ls) and
  not process.name:(sudo or which or whoami or id or hostname or uptime or top or netstat or ps or pwd or ls or apt or
  dpkg or yum or rpm or dnf or dockerd or docker or snapd or snap) and
  not process.parent.executable:(/bin/* or /usr/bin/* or /run/k3s/* or /etc/network/* or /opt/Elastic/*)

Framework: MITRE ATT&CKTM

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