Processes with Trailing Spaces

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-*

Rule Severity: low
Risk Score: 21
Runs every: 60m
Searches indices from: now-119m
Maximum alerts per execution: ?
References:

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: ?
Rule authors:

• Elastic

Rule license: Elastic License v2

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

Framework: MITRE ATT&CK

• 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/