This documentation contains work-in-progress information for future Elastic Stack and Cloud releases. Use the version selector to view supported release docs. It also contains some Elastic Cloud serverless information. Check out our serverless docs for more details.
« TCC Bypass via Mounted APFS Snapshot Access Temporarily Scheduled Task Creation »
Elastic Docs ›Elastic Security Solution [8.16] ›Detections and alerts ›Prebuilt rule reference

Tampering of Bash Command-Line History

edit

Tampering of Bash Command-Line History

edit

Adversaries may attempt to clear or disable the Bash command-line history in an attempt to evade detection or forensic investigations.

Rule type: eql

Rule indices:

  • auditbeat-*
  • logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

Tags:

  • Elastic
  • Host
  • Linux
  • macOS
  • Threat Detection
  • Defense Evasion

Version: 100 (version history)

Added (Elastic Stack release): 7.9.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

edit











Rule query
edit








process where event.type in ("start", "process_started") and (
((process.args : ("rm", "echo") or (process.args : "ln" and
process.args : "-sf" and process.args : "/dev/null") or
(process.args : "truncate" and process.args : "-s0")) and
process.args : (".bash_history", "/root/.bash_history",
"/home/*/.bash_history","/Users/.bash_history",
"/Users/*/.bash_history", ".zsh_history",
"/root/.zsh_history", "/home/*/.zsh_history", "/Users/.zsh_history",
"/Users/*/.zsh_history")) or (process.name : "history" and
process.args : "-c") or (process.args : "export" and process.args :
("HISTFILE=/dev/null", "HISTFILESIZE=0")) or (process.args : "unset"
and process.args : "HISTFILE") or (process.args : "set" and
process.args : "history" and process.args : "+o") )











Threat mapping
edit




Framework: MITRE ATT&CKTM














Rule version history
edit










Version 100 (8.5.0 release)








    

  • 
Formatting only

    • 









Version 10 (8.4.0 release)








    

  • 
Formatting only

    • 









Version 8 (8.3.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    process where event.type in ("start", "process_started") and (
(process.args : ("rm", "echo") and process.args : (".bash_history",
"/root/.bash_history", "/home/*/.bash_history")) or (process.name :
"history" and process.args : "-c") or (process.args : "export" and
process.args : ("HISTFILE=/dev/null", "HISTFILESIZE=0")) or
(process.args : "unset" and process.args : "HISTFILE") or
(process.args : "set" and process.args : "history" and process.args :
"+o") )
    

    

    • 









Version 7 (8.2.0 release)








    

  • 
Formatting only

    • 









Version 6 (7.12.0 release)








    

  • 
Rule name changed from: Deletion of Bash Command Line History

    • 

  • 

    Updated query, changed from:
    

    

    

    event.category:process AND event.type:(start or process_started) AND
process.name:rm AND
process.args:/\/(home\/.{1,255}|root)\/\.bash_history/
    

    

    • 









Version 5 (7.11.2 release)








    

  • 
Formatting only

    • 









Version 4 (7.11.0 release)








    

  • 
Formatting only

    • 









Version 3 (7.10.0 release)








    

  • 
Formatting only

    • 









Version 2 (7.9.1 release)








    

  • 
Formatting only

    • 




















« TCC Bypass via Mounted APFS Snapshot Access


Temporarily Scheduled Task Creation »