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Replace legacy rule with a new one - #6241

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norbert791 wants to merge 2 commits into
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norbert791:norbert791/replace-rule
Open

Replace legacy rule with a new one#6241
norbert791 wants to merge 2 commits into
SigmaHQ:masterfrom
norbert791:norbert791/replace-rule

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@norbert791 norbert791 commented Aug 18, 2026

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Summary of the Pull Request

This PR deprecates a rule that matched uses of Test-NetConnection powershell command. It also introduces new rule meant to provide improved coverage for the retired rule. It includes additional commands, including .Net classes. It has broader scope and does not have explicit filter, since it introduced unexpected false negatives. The chosen severity for the new rule is 'low'.

The CLI tools selection is limited, but includes what's likely available on any windows host and can be easliy used to probe TCP ports.

Changelog

new: Port Probing Via PowerShell Network Cmdlets Or .NET Sockets
remove: Testing Usage of Uncommonly Used Port - deprecated in favour of 0f0a89f7-0fae-48f6-bb47-26c7b9e3c5bd

Example Log Event

Fixed Issues

Closes #6132

SigmaHQ Rule Creation Conventions

  • If your PR adds new rules, please consider following and applying these conventions

@github-actions github-actions Bot added Rules Review Needed The PR requires review Windows Pull request add/update windows related rules labels Aug 18, 2026
@norbert791
norbert791 force-pushed the norbert791/replace-rule branch from 8ef9e73 to 804058b Compare August 18, 2026 17:09
@norbert791
norbert791 marked this pull request as ready for review August 18, 2026 17:09
@norbert791 norbert791 changed the title Norbert791/replace rule Replace legacy rule with a new one Aug 18, 2026
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[Rule modification] Testing Usage of Uncommonly Used Port

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