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Detection rules › Sigma

Credentials In Files - Linux

Status
test
Severity
high
Log source
product linux, service auditd
Author
Igor Fits, oscd.community
Source
github.com/SigmaHQ/sigma

Detecting attempts to extract passwords with grep

MITRE ATT&CK coverage

TacticTechniques
Credential Access

Telemetry coverage

PlatformRecord / event type
Linuxauditd EXECVE record: Arguments supplied to the execve system call

Rule body

title: Credentials In Files - Linux
id: df3fcaea-2715-4214-99c5-0056ea59eb35
status: test
description: 'Detecting attempts to extract passwords with grep'
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1552.001/T1552.001.md
author: 'Igor Fits, oscd.community'
date: 2020-10-15
modified: 2023-04-30
tags:
    - attack.credential-access
    - attack.t1552.001
logsource:
    product: linux
    service: auditd
detection:
    selection:
        type: 'EXECVE'
    keywords:
        '|all':
            - 'grep'
            - 'password'
    condition: selection and keywords
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection and keywords

Stage 1: selection

selection:
    type: 'EXECVE'

Stage 2: keywords

keywords:
    '|all':
        - 'grep'
        - 'password'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
typeeq
  • EXECVE
field:"type" kind:eq value:"EXECVE"