Suspicious File Creation in /etc for Persistence

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Suspicious File Creation in /etc for Persistence

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Detects the manual creation of files in specific etc directories, via user root, used by Linux malware to persist and elevate privileges on compromised systems. File creation in these directories should not be entirely common and could indicate a malicious binary or script installing persistence mechanisms for long term access.

Rule type: eql

Rule indices:

  • logs-endpoint.events.*
  • 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
  • Threat: Orbit
  • Threat: Lightning Framework
  • Data Source: Elastic Endgame
  • Data Source: Elastic Defend

Version: 109

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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file where host.os.type == "linux" and event.type in ("creation", "file_create_event") and user.name == "root" and
file.path : ("/etc/ld.so.conf.d/*", "/etc/cron.d/*", "/etc/sudoers.d/*", "/etc/rc.d/init.d/*", "/etc/systemd/system/*",
"/usr/lib/systemd/system/*") and not process.executable : ("*/dpkg", "*/yum", "*/apt", "*/dnf", "*/rpm", "*/systemd",
"*/snapd", "*/dnf-automatic","*/yum-cron", "*/elastic-agent", "*/dnfdaemon-system", "*/bin/dockerd", "*/sbin/dockerd",
"/kaniko/executor", "/usr/sbin/rhn_check") and not file.extension in ("swp", "swpx", "tmp")

Framework: MITRE ATT&CKTM