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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Processes with Trailing Spaces

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Processes with Trailing Spaces

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Identify instances where adversaries include trailing space characters to mimic regular files, disguising their activity to evade default file handling mechanisms.

Rule type: eql

Rule indices:

logs-endpoint.events.*
endgame-*
auditbeat-*
logs-auditd_manager.auditd-*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Domain: Endpoint
OS: Linux
OS: macOS
Use Case: Threat Detection
Tactic: Defense Evasion
Rule Type: BBR
Data Source: Elastic Defend
Data Source: Elastic Endgame
Data Source: Auditd Manager

Version: 2

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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process where event.type == "start" and event.action in ("exec", "exec_event", "executed", "process_started") and
process.name : "* "

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Masquerading
- ID: T1036
- Reference URL: https://attack.mitre.org/techniques/T1036/
Sub-technique:
- Name: Space after Filename
- ID: T1036.006
- Reference URL: https://attack.mitre.org/techniques/T1036/006/

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