Print History File Contents

SIGMA detection rule by Florian Roth (Nextron Systems) · NOASSERTION

Detects events in which someone prints the contents of history files to the commandline or redirects it to a file for reconnaissance

title: Print History File Contents
id: d7821ff1-4527-4e33-9f84-d0d57fa2fb66
status: test
description: Detects events in which someone prints the contents of history files to the commandline or redirects it to a file for reconnaissance
references:
    - https://github.com/sleventyeleven/linuxprivchecker/
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1552.003/T1552.003.md
author: Florian Roth (Nextron Systems)
date: 2022-06-20
modified: 2022-09-15
tags:
    - attack.reconnaissance
    - attack.t1592.004
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith:
            - '/cat'
            - '/head'
            - '/tail'
            - '/more'
    selection_history:
        - CommandLine|contains:
              - '/.bash_history'
              - '/.zsh_history'
        - CommandLine|endswith:
              - '_history'
              - '.history'
              - 'zhistory'
    condition: all of selection*
falsepositives:
    - Legitimate administration activities
level: medium

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

d9b01ecd-fbce-43ac-91a5-5aed75d0faee

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

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