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
Source
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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