Private Keys Reconnaissance Via CommandLine Tools — Sigma Rule

Rule metadata and linked tags

Author: frack113, Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2021-07-20 / 2023-03-06.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 379560506bae324e716da4df74a5d54fa75c647b9405cbc8d028035434b45147

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Private Keys Reconnaissance Via CommandLine Tools
id: 213d6a77-3d55-4ce8-ba74-fcfef741974e
status: test
description: Adversaries may search for private key certificate files on compromised systems for insecurely stored credential
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1552.004/T1552.004.md
author: frack113, Nasreddine Bencherchali (Nextron Systems)
date: 2021-07-20
modified: 2023-03-06
tags:
    - attack.credential-access
    - attack.t1552.004
logsource:
    category: process_creation
    product: windows
detection:
    selection_cmd_img:
        - Image|endswith: '\cmd.exe'
        - OriginalFileName: 'Cmd.Exe'
    selection_cmd_cli:
        CommandLine|contains: 'dir '
    selection_pwsh_img:
        - Image|endswith:
              - '\powershell.exe'
              - '\pwsh.exe'
        - OriginalFileName:
              - 'PowerShell.EXE'
              - 'pwsh.dll'
    selection_pwsh_cli:
        CommandLine|contains: 'Get-ChildItem '
    selection_findstr:
        - Image|endswith: '\findstr.exe'
        - OriginalFileName: 'FINDSTR.EXE'
    selection_ext:
        CommandLine|contains:
            - '.key'
            - '.pgp'
            - '.gpg'
            - '.ppk'
            - '.p12'
            - '.pem'
            - '.pfx'
            - '.cer'
            - '.p7b'
            - '.asc'
    condition: selection_ext and (all of selection_cmd_* or all of selection_pwsh_* or selection_findstr)
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1552.004/T1552.004.md