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Update whitespace stuffing regex and generic document sharing thread exclusion #4556

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Update whitespace stuffing regex and generic document sharing thread exclusion #4556

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10 changes: 9 additions & 1 deletion detection-rules/credential_phishing_generic_document_sharing.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,15 @@ severity: "medium"
source: |
type.inbound
// exclude if it's a reply to an existing conversation
and not length(body.previous_threads) > 0
and (
not length(body.previous_threads) > 0
// allow through if self-sender BCC pattern (compromised account thread replay)
or (
length(recipients.to) == 1
and length(recipients.cc) == 0
and sender.email.email == recipients.to[0].email.email
)
)
and (
// subject contains document sharing language
regex.icontains(subject.base,
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4 changes: 4 additions & 0 deletions detection-rules/evasion_excessive_image_padding_cred_theft.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,10 @@ source: |
or regex.icontains(body.html.raw,
'(?:<div\s+style="[^"]+"\s*[^>]*>\s*<br\s*/?\s*>\s*</div>\s*){20,}'
)
// class-attributed div-br blocks repeated 20+ times (Outlook elementToProof pattern)
or regex.icontains(body.html.raw,
'(?:<div\s+class="[^"]*"[^>]*>\s*<br\s*/?\s*>\s*</div>\s*){20,}'
)
// p-nbsp blocks repeated 25+ times
or regex.icontains(body.html.raw,
'(?:<p>\s*(?:&nbsp;|&#160;)\s*</p>\s*){25,}'
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