CMD Shell Output Redirect

SIGMA detection rule by frack113 · NOASSERTION

Detects the use of the redirection character ">" to redirect information on the command line. This technique is sometimes used by malicious actors in order to redirect the output of reconnaissance commands such as "hostname" and "dir" to files for future exfiltration.

title: CMD Shell Output Redirect
id: 4f4eaa9f-5ad4-410c-a4be-bc6132b0175a
related:
    - id: 8e0bb260-d4b2-4fff-bb8d-3f82118e6892
      type: similar
status: test
description: |
    Detects the use of the redirection character ">" to redirect information on the command line.
    This technique is sometimes used by malicious actors in order to redirect the output of reconnaissance commands such as "hostname" and "dir" to files for future exfiltration.
references:
    - https://ss64.com/nt/syntax-redirection.html
author: frack113
date: 2022-01-22
modified: 2024-03-19
tags:
    - attack.discovery
    - attack.t1082
    - detection.threat-hunting
logsource:
    category: process_creation
    product: windows
detection:
    selection_cmd:
        - OriginalFileName: 'Cmd.Exe'
        - Image|endswith: '\cmd.exe'
    selection_cli:
        CommandLine|contains: '>'
    filter_optional_idm_extension:
        CommandLine|contains:
            - 'C:\Program Files (x86)\Internet Download Manager\IDMMsgHost.exe'
            - 'chrome-extension://'
            - '\\.\pipe\chrome.nativeMessaging'
    condition: all of selection_* and not 1 of filter_optional_*
falsepositives:
    - Internet Download Manager extensions use named pipes and redirection via CLI. Filter it out if you use it in your environment
level: low

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

e5648764-b1a8-4bc2-8f79-8d688dfc7823

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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.

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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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