Brand impersonation: Chase Bank

Impersonation of Chase Bank and related services to harvest credentials or related information such as dates of birth, phone numbers, social security numbers, ATM pin numbers, drivers license numbers, selfies, and ID card photos.

Sublime rule (View on GitHub)

 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    (
38      sender.email.domain.root_domain in $high_trust_sender_root_domains
39      and (
40        any(distinct(headers.hops, .authentication_results.dmarc is not null),
41            strings.ilike(.authentication_results.dmarc, "*fail")
42        )
43      )
44    )
45    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
46  )
47  // and not solicited
48  and not profile.by_sender().solicited  
49attack_types:
50  - "Credential Phishing"
51tactics_and_techniques:
52  - "Impersonation: Brand"
53  - "Lookalike domain"
54  - "Social engineering"
55detection_methods:
56  - "Header analysis"
57  - "Sender analysis"
58id: "c680f1e7-01b9-5b95-897b-65957f4a57aa"
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