Detection rules › Sublime MQL
Brand impersonation: FINRA
Impersonation of the Financial Industry Regulatory Authority (FINRA)
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
| Message attribute |
|---|
| body.current_thread |
| sender |
| sender.email |
| type |
Rule body MQL
type.inbound
and (
strings.ilevenshtein(sender.display_name, 'finra') <= 1
or strings.ilevenshtein(sender.email.domain.sld, 'finra') <= 1
)
and any(ml.nlu_classifier(body.current_thread.text).entities,
.name == "financial"
)
and length(ml.nlu_classifier(body.current_thread.text).intents) > 0
and sender.email.domain.root_domain not in~ (
'finra.org',
'finrax.com',
'finca.wine', // a wine company
'finta.com' // unrelated domain caught by levenshtein
)
and (
(
profile.by_sender().prevalence in ("new", "outlier")
and not profile.by_sender().solicited
)
or (
profile.by_sender().any_messages_malicious_or_spam
and not profile.by_sender().any_messages_benign
)
)
Detection logic
Scope: inbound message.
Impersonation of the Financial Industry Regulatory Authority (FINRA)
- inbound message
any of:
- sender.display_name is similar to 'finra'
- sender.email.domain.sld is similar to 'finra'
any of
ml.nlu_classifier(body.current_thread.text).entitieswhere:- .name is 'financial'
- length(ml.nlu_classifier(body.current_thread.text).intents) > 0
- sender.email.domain.root_domain not in ('finra.org', 'finrax.com', 'finca.wine', 'finta.com')
any of:
all of:
- profile.by_sender().prevalence in ('new', 'outlier')
not:
- profile.by_sender().solicited
all of:
- profile.by_sender().any_messages_malicious_or_spam
not:
- profile.by_sender().any_messages_benign
Inspects: body.current_thread.text, sender.display_name, sender.email.domain.root_domain, sender.email.domain.sld, type.inbound. Sensors: ml.nlu_classifier, profile.by_sender, strings.ilevenshtein.
Indicators matched (6)
| Field | Match | Value |
|---|---|---|
strings.ilevenshtein | fuzzy | finra |
ml.nlu_classifier(body.current_thread.text).entities[].name | equals | financial |
sender.email.domain.root_domain | member | finra.org |
sender.email.domain.root_domain | member | finrax.com |
sender.email.domain.root_domain | member | finca.wine |
sender.email.domain.root_domain | member | finta.com |