Brand impersonation: KnowBe4

type.inbound
and (
  sender.display_name =~ 'KnowBe4'
  or strings.ilevenshtein(sender.display_name, 'KnowBe4') <= 1
  or strings.icontains(sender.email.domain.domain, '*KnowBe4*')
)
and (
  sender.email.domain.root_domain not in ('knowbe4.com')
  or (
    sender.email.domain.root_domain in ('knowbe4.com')
    and not headers.auth_summary.dmarc.pass
  )
)

// 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
)