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Potential Linux Local Account Brute Force Detected

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Potential Linux Local Account Brute Force Detected

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Identifies multiple consecutive login attempts executed by one process targeting a local linux user account within a short time interval. Adversaries might brute force login attempts across different users with a default wordlist or a set of customly crafted passwords in an attempt to gain access to these accounts.

Rule type: eql

Rule indices:

  • 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:

  • Domain: Endpoint
  • OS: Linux
  • Use Case: Threat Detection
  • Tactic: Credential Access

Version: 1

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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sequence by host.id, process.parent.executable, user.name with maxspan=1s
[ process where host.os.type == "linux" and event.type == "start" and
  event.action == "exec" and process.name == "su" ] with runs=10

Framework: MITRE ATT&CKTM

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