Brand impersonation: KnowBe4

 1name: "Brand impersonation: KnowBe4"
 2description: "Impersonation of KnowBe4."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and (
 8    sender.display_name =~ 'KnowBe4'
 9    or strings.ilevenshtein(sender.display_name, 'KnowBe4') <= 1
10    or strings.icontains(sender.email.domain.domain, '*KnowBe4*')
11  )
12  and (
13    sender.email.domain.root_domain not in ('knowbe4.com')
14    or (
15      sender.email.domain.root_domain in ('knowbe4.com')
16      and not headers.auth_summary.dmarc.pass
17    )
18  )
19  
20  // negate highly trusted sender domains unless they fail DMARC authentication
21  and not (
22    sender.email.domain.root_domain in $high_trust_sender_root_domains
23    and coalesce(headers.auth_summary.dmarc.pass, false)
24  )  
25attack_types:
26  - "Credential Phishing"
27  - "Spam"
28tactics_and_techniques:
29  - "Free email provider"
30  - "Impersonation: Brand"
31  - "Lookalike domain"
32  - "Social engineering"
33detection_methods:
34  - "Computer Vision"
35  - "Header analysis"
36  - "Sender analysis"
37id: "7c798386-fd25-5890-83b3-85187adbfc44"