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Description

During a runner request, I was able to identify based on this blog and further hunting several ways to detect improperly configured SPF & Dmarc setups allowing auth failures to bypass traditional security checks.

This is mostly related to organizations not properly configuring their records.

Associated samples

  • See escalation and hunt

Associated hunts

@MSAdministrator MSAdministrator self-assigned this Jan 17, 2026
@MSAdministrator MSAdministrator added the in-test-rules PR is in our testing suite to collect telemetry label Jan 17, 2026
@MSAdministrator MSAdministrator requested a review from a team as a code owner January 17, 2026 04:59
github-actions bot added a commit to aidenmitchell/sublime-rules that referenced this pull request Jan 17, 2026
…365 authentication bypass with suspicious error codes
github-actions bot added a commit to aidenmitchell/sublime-rules that referenced this pull request Jan 17, 2026
…ication bypass with suspicious error codes
github-actions bot added a commit to aidenmitchell/sublime-rules that referenced this pull request Jan 17, 2026
…ft 365 authentication bypass with suspicious error codes
github-actions bot added a commit to aidenmitchell/sublime-rules that referenced this pull request Jan 17, 2026
…entication bypass with suspicious error codes
github-actions bot added a commit that referenced this pull request Jan 20, 2026
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