Brand impersonation: Blockchain[.]com

calendar Jan 21, 2026  ยท
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Impersonation of Blockchain[.]com, usually for credential theft.

Sublime rule (View on GitHub)

 1name: "Brand impersonation: Blockchain[.]com"
 2description: |
 3    Impersonation of Blockchain[.]com, usually for credential theft.
 4type: "rule"
 5severity: "medium"
 6source: |
 7  type.inbound
 8  and (
 9    regex.imatch(sender.display_name, '\bblockchain\b')
10    or strings.ilevenshtein(sender.display_name, 'blockchain') <= 1
11    or strings.ilike(sender.email.domain.domain, '*blockchain.com*')
12    or any(body.links,
13           strings.ilevenshtein(.href_url.domain.root_domain, 'blockchain') == 1
14    )
15  )
16  and not any(ml.nlu_classifier(body.current_thread.text).topics,
17              .name in ("Educational and Research", "Advertising and Promotions")
18              and .confidence == "high"
19  )
20  and not (
21    sender.email.domain.root_domain in~ (
22      'blockchain.com',
23      'wxblockchain.com',
24      'ai-blockchain.com',
25      'envisionblockchain.com'
26    )
27    and coalesce(headers.auth_summary.dmarc.pass, false)
28  )
29  and not profile.by_sender_email().solicited  
30attack_types:
31  - "Credential Phishing"
32tactics_and_techniques:
33  - "Impersonation: Brand"
34  - "Lookalike domain"
35  - "Social engineering"
36detection_methods:
37  - "Header analysis"
38  - "Sender analysis"
39id: "0d85e555-bf7c-50a9-afba-de3c67818b6f"
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