Brand impersonation: Bank of America

 1name: "Brand impersonation: Bank of America"
 2description: |
 3    Impersonation of Bank of America, usually for credential theft.
 4references:
 5  - "https://www.techrepublic.com/article/credential-phishing-attack-impersonates-bank-of-america/"
 6type: "rule"
 7severity: "high"
 8source: |
 9  type.inbound
10  and (
11    sender.display_name =~ 'bank of america'
12    or strings.ilevenshtein(sender.display_name, 'bank of america') <= 2
13    or strings.ilike(sender.email.domain.domain, '*bankofamerica*')
14  )
15  and sender.email.domain.root_domain not in~ (
16    'bankofamerica.com',
17    'transunion.com',
18    'bofa.com',
19    'bofamerchantservices.com'
20  )
21  and (
22    sender.email.email not in $recipient_emails
23    or (
24      length(recipients.to) == 1
25      and sender.email.email == recipients.to[0].email.email
26    )
27  )
28  
29  // negate highly trusted sender domains unless they fail DMARC authentication
30  and not (
31    sender.email.domain.root_domain in $high_trust_sender_root_domains
32    and coalesce(headers.auth_summary.dmarc.pass, false)
33  )  
34attack_types:
35  - "Credential Phishing"
36tactics_and_techniques:
37  - "Impersonation: Brand"
38  - "Lookalike domain"
39  - "Social engineering"
40detection_methods:
41  - "Header analysis"
42  - "Sender analysis"
43id: "d2fc6ea1-0c8d-57e0-bcaa-732a2e6b76e4"