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Update service_abuse_sendgrid_impersonation.yml #3704

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Merged
zoomequipd merged 1 commit into from
Jan 5, 2026
Merged

Update service_abuse_sendgrid_impersonation.yml #3704

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17 changes: 9 additions & 8 deletions detection-rules/service_abuse_sendgrid_impersonation.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -16,9 +16,7 @@ source: |
)
and (
sender.display_name is null
or strings.ilike(strings.replace_confusables(subject.base),
'*sendgrid*'
)
or strings.ilike(strings.replace_confusables(subject.base), '*sendgrid*')
)
)
or any(ml.logo_detect(file.message_screenshot()).brands,
Expand All @@ -29,13 +27,16 @@ source: |
and any(headers.domains,
strings.icontains(.domain, 'outbound-mail.sendgrid.net')
)
// new senders only
and profile.by_sender_email().prevalence == "new"

// not common senders with valid domains
// this catches cases where the domain is invalid and senders become common
and not (
profile.by_sender_email().prevalence == "common" and sender.email.domain.valid
)

// negate legit sendgrid messages
and not (
sender.email.domain.domain == "sendgrid.com"
and coalesce(headers.auth_summary.dmarc.pass, false)
sender.email.domain.domain == "sendgrid.com"
and coalesce(headers.auth_summary.dmarc.pass, false)
)

attack_types:
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