Brand Impersonation: Gemini Trust Company

 1name: "Brand Impersonation: Gemini Trust Company"
 2description: "Detects messages impersonating Gemini Trust Company through analysis of footer content, social media links, and address verification, excluding legitimate communications from authenticated Gemini domains."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and (
 8    // the address in the footer
 9    (
10      regex.icontains(body.current_thread.text,
11                      "600 Third Avenue.{1,2}2nd Floor.{1,2}New York, NY"
12      )
13      and strings.icontains(body.current_thread.text, "Gemini Trust Company")
14    )
15    // logo detect combined with sender display name 
16    // need to be more specific here due to other uses of the word "Gemini"
17    or (
18      sender.display_name =~ "Gemini"
19      and any(ml.logo_detect(beta.message_screenshot()).brands,
20              .name == "Gemini Trust" and .confidence != "low"
21      )
22    )
23    // copyright footer
24    or strings.icontains(body.current_thread.text, '© 2025 Gemini Trust Company, LLC')
25  
26    // the social links in the footer
27    or (
28      length(filter(body.links,
29                    strings.icontains(.href_url.url,
30                                      'https://www.instagram.com/gemini/'
31                    )
32                    or strings.icontains(.href_url.url,
33                                         'https://www.linkedin.com/company/geminitrust/'
34                    )
35                    or strings.icontains(.href_url.url,
36                                         'https://facebook.com/GeminiTrust'
37                    )
38                    or strings.icontains(.href_url.url,
39                                         'https://twitter.com/Gemini'
40                    )
41                    or strings.icontains(.href_url.url,
42                                         'https://support.gemini.com/hc/en-us/requests/new'
43                    )
44                    or strings.icontains(.href_url.url,
45                                         'https://support.gemini.com/hc/en-us/requests/new'
46                    )
47             )
48      ) >= 4
49    )
50  )
51  // not forwards/replies
52  and not (
53    length(headers.references) > 0
54    and (subject.is_forward or subject.is_reply)
55    and length(body.previous_threads) >= 1
56  )
57  // not from Gemini actual
58  and not (
59    sender.email.domain.root_domain in (
60      "gemini.com", 
61      "niftygateway.com" // NFT market place owned by Gemini Trust Company
62    )
63    and headers.auth_summary.dmarc.pass
64  )  
65attack_types:
66  - "Credential Phishing"
67tactics_and_techniques:
68  - "Impersonation: Brand"
69  - "Social engineering"
70detection_methods:
71  - "Content analysis"
72  - "URL analysis"
73  - "Sender analysis"
74  - "Header analysis"
75id: "99574c94-5095-5ec3-a63c-100fdd7dd414"