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High Severity

URI protocol handler: search-ms

Description

Detects HTML attachments using the search-ms URI protocol handler, a technique observed ITW to deliver malicious payloads.

This rule can be updated to analyze links in PDF attachments and message bodies

Sublime Security
Created Aug 17th, 2023 • Last updated Jan 12th, 2026
Source
type.inbound
and any(attachments,
        .file_type == "html"
        and any(file.explode(.),
                any(.scan.strings.strings,
                    regex.contains(., 'search-ms:query.*location:\\\\')
                )
        )
)
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