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Guerrero Mears LLP

cephalus

This record tracks a ransomware attack claimed by the cephalus group against Guerrero Mears LLP. It collects the publicly disclosed attack details — sector, location and timeline — as published on the operator's leak site and indexed by Breach House.

Window Zero

EXPOSURE GAP

Window Zero is the time the breach stayed in the open before anyone said so — the gap between when the attack was first discovered on the operator's leak site (t1) and when it was publicly disclosed (t2). The wider this window, the longer victims, staff and customers were exposed with no warning.

-87days
t1 · Published t2 · Disclosed
Aug 26, 2025Jun 01, 2025
Country
United States
Business Category
Other
Employees
51-100
Discovered
2025-08-26
Published
August 26, 2025
Disclosed / Notified
Jun 01, 2025
Victim ID
loFOCsGCSE5c

Attack Summary

Guerrero Mears LLP DATALEAK | (FORGOT THE SIZE)

Leak Screenshots

SAMPLE

Proof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.

file_tree.png
finance_2024.xlsx
passport_scan.jpg
contract_signed.pdf
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Dark Web Exposure

Findings for gmllp.com — indexed by HaveIBeenRansom.
0
found in Infostealer logs
45+
found in Traditional breaches
5+
found in Ransomware leaks
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pureincubation-com.7z.001
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extracted_emails.txt
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••• emails
NY.csv
Durov · breach
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Neiman Marcus_.7z.001
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••• emails
+ 10 more leak sources locked
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Visit Website Original Post View Group: cephalus

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Legal Disclaimer: This ransomware victim record reflects information published on the operator's leak site. Breach.house does not acquire, download, host, access or redistribute unlawfully obtained data. It indexes only publicly visible information posted by ransomware, breach and infostealer operators and open web sources, without accessing the underlying stolen content. The service supports public awareness, legitimate research and cyber-resilience.