• Sublime Core Feed
Medium Severity

Brand impersonation: Interac

Labels

BEC/Fraud
Impersonation: Brand
Lookalike domain
Social engineering
Content analysis
Header analysis
Natural Language Understanding
Sender analysis

Description

Impersonation of the Canadian interbanking network Interac. Seen in the wild impersonating carbon tax rebates and tax return refunds.

References

No references.

Sublime Security
Created Sep 16th, 2024 • Last updated Sep 16th, 2024
Feed Source
Sublime Core Feed
Source
GitHub
type.inbound
and (
  strings.ilike(sender.display_name, '*interac e-transfer*')
  or strings.ilike(sender.display_name, "*interac e?trasfer*")
  or strings.ilike(subject.subject, '*interac e-transfer*')
  or strings.ilevenshtein(sender.display_name, 'interac e-transfer') <= 2
)
and sender.email.domain.root_domain not in ('interac.ca')
and 1 of (
  any(ml.nlu_classifier(body.current_thread.text).entities,
      .name == "org" and strings.icontains(.text, "interac")
  ),
  any(ml.nlu_classifier(body.current_thread.text).entities,
      .name == "financial"
  ),
)
and not profile.by_sender().solicited

// 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
)
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