Brand impersonation: Sublime Security

 1name: "Brand impersonation: Sublime Security"
 2description: |
 3    Possible attempt to impersonate Sublime Security executives.
 4references:
 5  - "https://sandbox.sublimesecurity.com?id=612ff73b-e22d-4176-9e22-2b841b60a237"
 6type: "rule"
 7severity: "high"
 8source: |
 9  type.inbound
10  and (
11    sender.display_name in~ (
12      'Sublime Security',
13      'Josh Kamdjou',
14      'Joshua Kamdjou',
15      'Ian Thiel'
16    )
17    or strings.ilevenshtein(sender.email.domain.domain, 'sublimesecurity.com') <= 2
18  )
19  and sender.email.domain.root_domain not in ('sublimesecurity.com', 'luma-mail.com')
20  and (
21    profile.by_sender().prevalence in ("new", "outlier")
22    or (
23      profile.by_sender().any_messages_malicious_or_spam
24      and not profile.by_sender().any_false_positives
25    )
26  )
27  
28  // negate highly trusted sender domains unless they fail DMARC authentication
29  and (
30    (
31      sender.email.domain.root_domain in $high_trust_sender_root_domains
32      and not headers.auth_summary.dmarc.pass
33    )
34    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
35  )  
36
37attack_types:
38  - "Credential Phishing"
39tactics_and_techniques:
40  - "Impersonation: Brand"
41  - "Lookalike domain"
42  - "Social engineering"
43detection_methods:
44  - "Sender analysis"
45id: "949484ed-c774-5f53-b91f-cd02ee6104f9"