Was MONTALBAARCHITECTS.COM hit by ransomware?

MONTALBAARCHITECTS.COM was listed by the Cl0p ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Cl0p ransomware group?

Cl0p is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the MONTALBAARCHITECTS.COM breach?

Cl0p published data attributed to MONTALBAARCHITECTS.COM. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Montalba Architects, Inc.

listed as MONTALBAARCHITECTS.COM · Claimed by Cl0p · listed 5 months ago

Age

since listed · data leaked

Status timeline

ListedJan 25, 2026
Data leakeddate unknown

At a glance

Group: Cl0p
Status: Data leaked
Country: United States
Sector: Construction
Listed on leak site: Jan 25, 2026

About the victim

AI dossier — public-source company profile

Montalba Architects, Inc. is an international architecture practice founded by David Montalba with offices in Los Angeles (Santa Monica), New York, and Lausanne, Switzerland. The firm handles residential, retail, commercial, hospitality, and urban projects, and was named AIA California Firm of the Year for 2026. They are known for contextual yet conceptual design with an emphasis on spatial fluidity and environmentally-conscious solutions.

Industry: Architecture & Design
Address: 2525 Michigan Ave., Bldg. T4, Santa Monica, CA 90404
Founded: 2003

Attack summary

Severity: medium — Data is listed as published by Cl0p, indicating confirmed exfiltration; however, no specific sensitive regulated data (e.g., PII at scale, medical, financial) is identified, no ransom was stated, and the firm is a mid-size architecture practice without known critical-infrastructure significance. Moderate business and client data exposure warrants medium severity.

Cl0p claims to have compromised Montalba Architects, Inc. and the disclosure status is listed as data_published, indicating exfiltration and publication of company data. No specific data categories or ransom amount were stated in the post.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Architectural project files
Business correspondence
Client records
Internal company documents

Original description

AI-summarised, not from the leak post

MONTALBA ARCHITECTS, INC. is a Swiss and American-based architecture firm founded by David Montalba. With offices in Santa Monica, California and Lausanne, Switzerland, they handle both residential and commercial projects. Known for their attention to detail, spatial fluidity, and creative use of light, they have won numerous design awards. They also prioritize environmentally-friendly solutions.

Sources

Victim siteMONTALBAARCHITECTS.COM

Source

Indexed 5 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

Disclosure context

About Cl0p

The Cl0p (also known as Clop) ransomware group is a financially motivated cybercriminal organization that emerged in March 2020, operating as part of the broader TA505/FIN11 threat landscape and conducting high-impact ransomware campaigns targeting organizations globally. The group is believed to operate from Russian-speaking territories and has been linked to the prolific TA505 cybercriminal consortium, functioning as a Ransomware-as-a-Service operation that collaborates with various affiliate groups to maximize their operational reach. Cl0p primarily gains initial access through exploitation of zero-day vulnerabilities in file transfer applications, phishing campaigns, and SQL injection attacks, employing double extortion tactics by exfiltrating sensitive data before deploying their custom ransomware payload, which uses strong encryption algorithms to render victim systems inoperable. The group has been responsible for several high-profile campaigns, most notably their exploitation of zero-day vulnerabilities in MOVEit Transfer software in 2023, which affected hundreds of organizations worldwide including major corporations and government entities, and their previous campaigns targeting Accellion FTA and other file transfer solutions that resulted in the compromise of sensitive data from numerous high-value targets. Cl0p remains active as of 2024, continuing to evolve their tactics and maintain their position as one of the most prolific ransomware groups globally, with over 1,490 documented victims primarily concentrated in the United States, Canada, United Kingdom, Germany, and Australia across technology, manufacturing, transportation, and consumer services sectors. The group has been linked to 1,490 public disclosures across our corpus. First observed on a leak site on March 13, 2020; most recent post February 14, 2026. The operation is currently active.

Also tracked as: Clop, TA505, FIN11.

Timeline of this disclosure

January 25, 2026MONTALBAARCHITECTS.COM listed by Cl0pon the group's public leak site

Other recent disclosures by Cl0p

Cl0p has been linked to 1,490 public victims on Darkfield. A sample of the most recent:

See the full Cl0p dossier →

Sector and geography

This disclosure adds to ransomware activity in the Construction sector, which has 415 disclosures indexed across all operators we track. Geographically, MONTALBAARCHITECTS.COM is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Cl0p means MONTALBAARCHITECTS.COM appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Monitor for the data appearing on Cl0p's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.