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Update regex patterns for voicemail phishing detection #3434

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merged 2 commits into from
Oct 30, 2025
Merged

Update regex patterns for voicemail phishing detection #3434

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5832a7d
Update regex patterns for voicemail phishing detection
peterdj45 Oct 24, 2025
bca21ab
Update detection-rules/link_credential_phishing_voicemail_language.yml
peterdj45 Oct 27, 2025
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7 changes: 6 additions & 1 deletion detection-rules/link_credential_phishing_voicemail_language.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ source: |
// split phrases that start with "caller" that occur within 3 words between or only punctation
'ca[li1][li1](?:er)?(?:\w+(\s\w+)?|[[:punct:]]+|\s+){0,3}(?:v[nm](\b|[[:punct:]])?|\bv[o0][il1]ce(?:mail|message)?|audi[o0]|missed(?:\sa\s)?|left( a)?)',
// strong phrases
'(?:open mp3|audi[o0] note|\.wav|left a vm|[^\s]+voip[^\s]*|unanswered.*ca[li1][li1]|incoming.vm|left msg|wireless ca[li1][li1]er|VM Service|v[o0][il1]ce message|missed.ca[li1][li1](?:e[rd])?|\bca[li1][li1].(?:support|service)(?: for| log)?|missed.{0,10} VM|new v[o0][il1]cemail from|new.v.m.from.\+?\d+|new v[o0][il1]cemail?(?:\w+(\s\w+)?|[[:punct:]]+|\s+){0,3}transcript(s|ion)?|message received|incoming transmission|voice note)',
'(?:open mp3|audi[o0] note|\.wav|left a vm|[^\s]+voip[^\s]*|unanswered.*ca[li1][li1]|incoming.vm|left msg|wireless ca[li1][li1]er|VM Service|v[o0][il1]ce message|missed.ca[li1][li1](?:e[rd])?|\bca[li1][li1].(?:support|service)(?: for| log)?|missed.{0,10} VM|new v[o0][il1]cemail from|new.v.m.from.\+?\d+|new v[o0][il1]cemail?(?:\w+(\s\w+)?|[[:punct:]]+|\s+){0,3}transcript(s|ion)?|message received|new (?:message|call|voicemail).{0,15}(?:info|notification|alert)|incoming transmission|voice note)',
// starts in the format of `(4)` and contains some voicemail keywords
'^\(\d\)\s(?:\w+(\s\w+)?|[[:punct:]]+|\s+){0,3}(?:message|voip|v[o0][il1]ce|unread|call)',
'ca[li1][li1](?:er)?(?:\w+(\s\w+)?|[[:punct:]]+|\s+){0,3}(?:playback|transcript)',
Expand Down Expand Up @@ -665,6 +665,11 @@ source: |
sender.email.domain.domain in $org_domains
and not coalesce(headers.auth_summary.dmarc.pass, false)
)
// match if the sender address is blank or null
or (
regex.match(sender.email.email, "")
or sender.email.email is null
)
)
)
attack_types:
Expand Down
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