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Lanmark Group

sinobi

This record tracks a ransomware attack claimed by the sinobi group against Lanmark Group. 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.

259days open
t1 · Published t2 · Pending
Dec 16, 2025Not disclosed yet
Country
United States
Business Category
Communication / Marketing
Employees
51-100
Discovered
2025-12-16
Published
December 16, 2025
Disclosed / Notified
Not disclosed yet
Victim ID
v0IoOvxMAbeU

Attack Summary

Lanmark Group, Inc. is a full-service general contracting firm based in Brooklyn, NY, founded in 2005. The company specializes in handling complex construction projects for both public and private sector clients, demonstrating a commitment to quality, safety, and client satisfaction. With a focus on meticulous planning and execution, Lanmark has established a strong reputation through their extensive portfolio of successful projects. Their expertise is showcased in multi-million dollar constructions, making them a trusted partner for state and municipal agencies.

Leak Screenshots

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

Findings for lanmarkgroup.com — indexed by HaveIBeenRansom.
0
found in Infostealer logs
274+
found in Traditional breaches
20+
found in Ransomware leaks
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Visit Website Original Post View Group: sinobi

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