IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Tampering of Bash Command-Line History
editTampering of Bash Command-Line History
editAdversaries 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
- Threat Detection
- Defense Evasion
Version: 6 (version history)
Added (Elastic Stack release): 7.9.0
Last modified (Elastic Stack release): 7.12.0
Rule authors: Elastic
Rule license: Elastic License v2
Rule query
editprocess 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") )
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Indicator Removal on Host
- ID: T1070
- Reference URL: https://attack.mitre.org/techniques/T1070/
Rule version history
edit- 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