Threat classification
Sublime's own taxonomy (not MITRE ATT&CK).
| Category | Values |
|---|---|
| Attack types | Credential Phishing |
| Tactics and techniques | Impersonation: Brand, Lookalike domain, Social engineering |
Event coverage
Rule body MQL
type.inbound
and (
regex.icontains(sender.display_name, '\PNC\b')
or strings.ilike(sender.email.domain.domain, '*PNC*')
or strings.ilike(subject.subject, '*PNC*')
)
and sender.email.domain.root_domain not in~ ('pnc.com', 'pncbank.com')
and sender.email.domain.tld != "pnc"
and any(ml.logo_detect(file.message_screenshot()).brands,
.name == "PNC" and .confidence in ("medium", "high")
)
and (
profile.by_sender().prevalence in ("new", "outlier")
or (
profile.by_sender().any_messages_malicious_or_spam
and not profile.by_sender().any_messages_benign
)
)
// not forwards/replies
and not (
(length(headers.references) > 0 or headers.in_reply_to is not null)
and (subject.is_forward or subject.is_reply)
and length(body.previous_threads) >= 1
)
// negate highly trusted sender domains unless they fail DMARC authentication
and (
(
sender.email.domain.root_domain in $high_trust_sender_root_domains
and not headers.auth_summary.dmarc.pass
)
or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)
Detection logic
Scope: inbound message.
Impersonation of PNC Financial Services
- inbound message
any of:
- sender.display_name matches '\\PNC\\b'
- sender.email.domain.domain matches '*PNC*'
- subject.subject matches '*PNC*'
- sender.email.domain.root_domain not in ('pnc.com', 'pncbank.com')
- sender.email.domain.tld is not 'pnc'
any of
ml.logo_detect(file.message_screenshot()).brandswhere all hold:- .name is 'PNC'
- .confidence in ('medium', 'high')
any of:
- profile.by_sender().prevalence in ('new', 'outlier')
all of:
- profile.by_sender().any_messages_malicious_or_spam
not:
- profile.by_sender().any_messages_benign
not:
all of:
any of:
- length(headers.references) > 0
- headers.in_reply_to is set
any of:
- subject.is_forward
- subject.is_reply
- length(body.previous_threads) ≥ 1
any of:
all of:
- sender.email.domain.root_domain in $high_trust_sender_root_domains
not:
- headers.auth_summary.dmarc.pass
- sender.email.domain.root_domain not in $high_trust_sender_root_domains
Inspects: body.previous_threads, headers.auth_summary.dmarc.pass, headers.in_reply_to, headers.references, sender.display_name, sender.email.domain.domain, sender.email.domain.root_domain, sender.email.domain.tld, subject.is_forward, subject.is_reply, subject.subject, type.inbound. Sensors: file.message_screenshot, ml.logo_detect, profile.by_sender, regex.icontains, strings.ilike. Reference lists: $high_trust_sender_root_domains.
Indicators matched (7)
| Field | Match | Value |
|---|---|---|
regex.icontains | regex | \PNC\b |
strings.ilike | substring | *PNC* |
sender.email.domain.root_domain | member | pnc.com |
sender.email.domain.root_domain | member | pncbank.com |
ml.logo_detect(file.message_screenshot()).brands[].name | equals | PNC |
ml.logo_detect(file.message_screenshot()).brands[].confidence | member | medium |
ml.logo_detect(file.message_screenshot()).brands[].confidence | member | high |