Detection rules › Sublime MQL
Brand Impersonation: Gemini Trust Company
Detects messages impersonating Gemini Trust Company through analysis of footer content, social media links, and address verification, excluding legitimate communications from authenticated Gemini domains.
Threat classification
Sublime's own taxonomy (not MITRE ATT&CK).
| Category | Values |
|---|---|
| Attack types | Credential Phishing |
| Tactics and techniques | Impersonation: Brand, Social engineering |
Event coverage
Rule body MQL
type.inbound
and (
// the address in the footer
(
regex.icontains(body.current_thread.text,
"600 Third Avenue.{1,2}2nd Floor.{1,2}New York, NY"
)
and strings.icontains(body.current_thread.text, "Gemini Trust Company")
)
// logo detect combined with sender display name
// need to be more specific here due to other uses of the word "Gemini"
or (
sender.display_name =~ "Gemini"
and any(ml.logo_detect(file.message_screenshot()).brands,
.name == "Gemini Trust" and .confidence != "low"
)
)
// copyright footer
or strings.icontains(body.current_thread.text,
'© 2025 Gemini Trust Company, LLC'
)
// the social links in the footer
or (
length(filter(body.links,
strings.icontains(.href_url.url,
'https://www.instagram.com/gemini/'
)
or strings.icontains(.href_url.url,
'https://www.linkedin.com/company/geminitrust/'
)
or strings.icontains(.href_url.url,
'https://facebook.com/GeminiTrust'
)
or strings.icontains(.href_url.url,
'https://twitter.com/Gemini'
)
or strings.icontains(.href_url.url,
'https://support.gemini.com/hc/en-us/requests/new'
)
or strings.icontains(.href_url.url,
'https://support.gemini.com/hc/en-us/requests/new'
)
)
) >= 4
)
)
// not forwards/replies
and not (
length(headers.references) > 0
and (subject.is_forward or subject.is_reply)
and length(body.previous_threads) >= 1
)
// not from Gemini actual
and not (
sender.email.domain.root_domain in (
"gemini.com",
"niftygateway.com" // NFT market place owned by Gemini Trust Company
)
and headers.auth_summary.dmarc.pass
)
Detection logic
Scope: inbound message.
Detects messages impersonating Gemini Trust Company through analysis of footer content, social media links, and address verification, excluding legitimate communications from authenticated Gemini domains.
- inbound message
any of:
all of:
- body.current_thread.text matches '600 Third Avenue.{1,2}2nd Floor.{1,2}New York, NY'
- body.current_thread.text contains 'Gemini Trust Company'
all of:
- sender.display_name is 'Gemini'
any of
ml.logo_detect(file.message_screenshot()).brandswhere all hold:- .name is 'Gemini Trust'
- .confidence is not 'low'
- body.current_thread.text contains '© 2025 Gemini Trust Company, LLC'
- length(filter(body.links, strings.icontains(.href_url.url, 'https://www.instagram.com/gemini/') or strings.icontains(.href_url.url, 'https://www.linkedin.com/company/geminitrust/') or strings.icontains(.href_url.url, 'https://facebook.com/GeminiTrust') or strings.icontains(.href_url.url, 'https://twitter.com/Gemini') or strings.icontains(.href_url.url, 'https://support.gemini.com/hc/en-us/requests/new') or strings.icontains(.href_url.url, 'https://support.gemini.com/hc/en-us/requests/new'))) ≥ 4
not:
all of:
- length(headers.references) > 0
any of:
- subject.is_forward
- subject.is_reply
- length(body.previous_threads) ≥ 1
not:
all of:
- sender.email.domain.root_domain in ('gemini.com', 'niftygateway.com')
- headers.auth_summary.dmarc.pass
Inspects: body.current_thread.text, body.links, body.links[].href_url.url, body.previous_threads, headers.auth_summary.dmarc.pass, headers.references, sender.display_name, sender.email.domain.root_domain, subject.is_forward, subject.is_reply, type.inbound. Sensors: file.message_screenshot, ml.logo_detect, regex.icontains, strings.icontains.
Indicators matched (12)
| Field | Match | Value |
|---|---|---|
regex.icontains | regex | 600 Third Avenue.{1,2}2nd Floor.{1,2}New York, NY |
strings.icontains | substring | Gemini Trust Company |
sender.display_name | equals | Gemini |
ml.logo_detect(file.message_screenshot()).brands[].name | equals | Gemini Trust |
strings.icontains | substring | © 2025 Gemini Trust Company, LLC |
strings.icontains | substring | https://www.instagram.com/gemini/ |
strings.icontains | substring | https://www.linkedin.com/company/geminitrust/ |
strings.icontains | substring | https://facebook.com/GeminiTrust |
strings.icontains | substring | https://twitter.com/Gemini |
strings.icontains | substring | https://support.gemini.com/hc/en-us/requests/new |
sender.email.domain.root_domain | member | gemini.com |
sender.email.domain.root_domain | member | niftygateway.com |