Brand impersonation: Chase Bank

 1name: "Brand impersonation: Chase Bank"
 2description: |
 3  Impersonation of Chase Bank and related services to harvest credentials or related information 
 4  such as dates of birth, phone numbers, social security numbers, ATM pin numbers, drivers license 
 5  numbers, selfies, and ID card photos.  
 6references:
 7  - "https://cyware.com/news/new-phishing-scam-impersonating-chase-bank-asks-for-sensitive-data-including-selfies-53065228"
 8type: "rule"
 9severity: "high"
10source: |
11  type.inbound
12  and (
13    strings.ilike(sender.display_name,
14                  '*chase sapphire*',
15                  '*chase card services*',
16                  '*united mileageplus*',
17                  "echase*"
18    )
19    or strings.ilevenshtein(sender.display_name, 'chase sapphire') <= 2
20    or strings.ilevenshtein(sender.display_name, 'chase card services') <= 2
21    or strings.ilevenshtein(sender.display_name, 'united mileageplus') <= 2
22    or strings.ilevenshtein(sender.display_name, 'echase') <= 1
23  )
24  and sender.display_name not in~ ("chaser", "case")
25  and sender.email.domain.root_domain not in~ ('chase.com', 'united.com', 'transunion.com', 'shopping-chase.com')
26  and (
27    profile.by_sender().prevalence in ("new", "outlier")
28    or (
29      profile.by_sender().any_messages_malicious_or_spam
30      and not profile.by_sender().any_false_positives
31    )
32  )
33
34  // negate highly trusted sender domains unless they fail DMARC authentication
35  and (
36    (
37      sender.email.domain.root_domain in $high_trust_sender_root_domains
38      and not headers.auth_summary.dmarc.pass
39    )
40    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
41  )
42  // and not solicited
43  and not profile.by_sender().solicited  
44attack_types:
45  - "Credential Phishing"
46tactics_and_techniques:
47  - "Impersonation: Brand"
48  - "Lookalike domain"
49  - "Social engineering"
50detection_methods:
51  - "Header analysis"
52  - "Sender analysis"
53id: "c680f1e7-01b9-5b95-897b-65957f4a57aa"