Was MONTALBAARCHITECTS.COM hit by ransomware?

MONTALBAARCHITECTS.COM was listed by the clop 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 clop ransomware group?

clop 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?

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

Ransomware victim disclosure

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Montalba Architects

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

Age

since listed · data leaked

Status timeline

ListedJan 25, 2026
Data leakeddate unknown

At a glance

Group: Clop
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 is an international architecture practice headquartered in Santa Monica, California, with additional offices in New York and Lausanne, Switzerland. The firm works across residential, retail, commercial, hospitality, and urban project types, and was named AIA California Firm of the Year in 2026. Their portfolio spans projects in the United States and internationally.

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

Attack summary

Severity: medium — Data is marked as published by a prolific ransomware group (Clop), which typically involves exfiltration, but no proof files, data inventory, or specifics about the nature or volume of compromised data are visible in the post, warranting a medium rather than high rating.

Clop claims to have compromised Montalba Architects and has listed them as a victim with data published status; however, the leaked post content is non-descriptive and provides no explicit detail on whether data was exfiltrated or encrypted, nor what specific data is at stake.

medium

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.

The leak post

captured from the group's site

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Sources

Victim siteMONTALBAARCHITECTS.COM
Leak posthttp://santat7kpllt6iyvqbr7q4amdv6dzrh6paatvyrzl7ry3zm72zigf4ad.onion/montalbaarchitects-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.

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Disclosure context

About clop

**Overview:** Clop is a prominent ransomware group that emerged in March 2020, operating primarily for financial gain through large-scale extortion campaigns targeting organizations across multiple sectors. The group has demonstrated sophisticated capabilities and persistence, becoming one of the most prolific ransomware operators with over 1,250 documented victims globally. **Origin & Affiliation:** Clop is believed to be linked to the TA505 cybercriminal group and has suspected ties to Russian-speaking threat actors, though they operate as an independent ransomware enterprise rather than a traditional RaaS model. The group has shown connections to other malware families and has been associated with the FIN11 financial crime group. **Attack Methodology:** Clop primarily gains initial access through exploitation of zero-day vulnerabilities in file transfer applications, most notably targeting MOVEit Transfer software in 2023, along with previous campaigns against Accellion FTA and other file transfer solutions. The group employs double extortion tactics, stealing sensitive data before encryption and threatening public disclosure on their leak site if ransom demands are not met, utilizing their own custom Clop ransomware variant that employs strong encryption algorithms. **Notable Campaigns:** The group's most significant campaign occurred in 2023 when they exploited a zero-day vulnerability in Progress Software's MOVEit Transfer application, affecting hundreds of organizations worldwide including major corporations, government agencies, and healthcare systems, making it one of the largest ransomware campaigns in history. This attack alone impacted millions of individuals whose personal data was compromised across multiple high-profile victims including major payroll processors and financial institutions. **Current Status:** Clop remains active as of 2024, continuing to conduct ransomware operations despite law enforcement efforts and increased scrutiny following their massive MOVEit campaign. The group has been linked to 1,254 public disclosures across our corpus. First observed on a leak site on March 13, 2020; most recent post May 1, 2026. The operation is currently active.

Also tracked as: Cl0p.

Timeline of this disclosure

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

Other recent disclosures by clop

clop has been linked to 1,254 public victims on Darkfield. A sample of the most recent:

See the full clop 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 clop 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 clop'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.