Detection rules › Sublime MQL
Brand impersonation: Fastway
Impersonation of Fastway Couriers, a delivery services company in Ireland and South Africa.
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 |
|---|
| headers.auth_summary |
| sender |
| sender.email |
| type |
Rule body MQL
type.inbound
and (
strings.ilike(sender.display_name, '*fastway*')
or strings.ilevenshtein(sender.display_name, 'fastway couriers') <= 1
)
and sender.email.domain.root_domain not in~ (
'fastway.co.za',
'fastway.com.au',
'fastway.ie'
)
// 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
)
// and no false positives and not solicited
and (
not profile.by_sender().any_messages_benign
and not profile.by_sender().solicited
)
Detection logic
Scope: inbound message.
Impersonation of Fastway Couriers, a delivery services company in Ireland and South Africa.
- inbound message
any of:
- sender.display_name matches '*fastway*'
- sender.display_name is similar to 'fastway couriers'
- sender.email.domain.root_domain not in ('fastway.co.za', 'fastway.com.au', 'fastway.ie')
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
all of:
not:
- profile.by_sender().any_messages_benign
not:
- profile.by_sender().solicited
Inspects: headers.auth_summary.dmarc.pass, sender.display_name, sender.email.domain.root_domain, type.inbound. Sensors: profile.by_sender, strings.ilevenshtein, strings.ilike. Reference lists: $high_trust_sender_root_domains.
Indicators matched (5)
| Field | Match | Value |
|---|---|---|
strings.ilike | substring | *fastway* |
strings.ilevenshtein | fuzzy | fastway couriers |
sender.email.domain.root_domain | member | fastway.co.za |
sender.email.domain.root_domain | member | fastway.com.au |
sender.email.domain.root_domain | member | fastway.ie |