Brand impersonation: Wells Fargo

 1name: "Brand impersonation: Wells Fargo"
 2description: |
 3    Impersonation of Wells Fargo Bank.
 4references:
 5  - "https://www.americanbanker.com/news/wells-fargo-customers-targeted-with-phishing-attacks-using-calendar-invites"
 6  - "https://www.wellsfargo.com/biz/help/faqs/credit-card-rewards/"
 7type: "rule"
 8severity: "high"
 9source: |
10  type.inbound
11  and (
12    sender.display_name =~ 'wells fargo'
13    or strings.ilevenshtein(sender.display_name, 'wells fargo') <= 1
14    or strings.ilike(sender.email.domain.domain, '*wellsfargo*')
15    or strings.ilike(subject.subject, '*wells fargo security*')
16    or strings.ilike(body.plain.raw, '*wells fargo security team*')
17    or strings.ilike(body.html.inner_text, '*wells fargo security team*')
18  )
19  and sender.email.domain.root_domain not in~ (
20    'wellsfargo.com',
21    'wellsfargoadvisors.com',
22    'transunion.com',
23    'wellsfargoemail.com',
24    'wellsfargorewards.com',
25    'comcast-spectacor.com',
26    'investordelivery.com',
27    'comcastspectacor.com'
28  )
29  and sender.email.email not in $recipient_emails  
30attack_types:
31  - "Credential Phishing"
32tactics_and_techniques:
33  - "Impersonation: Brand"
34  - "Lookalike domain"
35  - "Social engineering"
36detection_methods:
37  - "Content analysis"
38  - "Sender analysis"
39id: "02d7301f-cc29-5031-9a1e-f013400805ba"