Was COBU-ARCH.COM hit by ransomware?

COBU-ARCH.COM was listed by the clop ransomware operation (Japan), 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 COBU-ARCH.COM breach?

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

Ransomware victim disclosure

← All victims

COBU Architecture Studio

listed as COBU-ARCH.COM · Claimed by Clop · listed 4 months ago

Age

since listed · data leaked

Status timeline

ListedFeb 7, 2026
Data leakeddate unknown

At a glance

Group: Clop
Status: Data leaked
Country: Japan
Listed on leak site: Feb 7, 2026

About the victim

AI dossier — public-source company profile

COBU Architecture Studio is an architecture firm founded in 2018 and based in Hoffman Estates, Illinois. The firm provides architecture, entitlement, and land planning services across multiple states, with a focus on socially meaningful projects. Their partners are NCARB certified and they offer supplemental services including structural, mechanical, electrical, and interior design through a network of consultants.

Industry: Architecture & Land Planning Services
Address: Hoffman Estates, IL, USA
Founded: 2018

Attack summary

Severity: medium — Data is marked as published by Clop, a group known for large-scale exfiltration, but the leak post provides no specific proof files, data inventory, or confirmation of regulated data exposure. The firm likely holds client project data and business records; without further evidence of PII or regulated data at scale, medium is appropriate.

Clop claims to have compromised COBU Architecture Studio and has disclosed the data (status: data_published); however, the leak post content is uninformative (a redirect queue message), and no specific details on encryption, exfiltration volume, or data types are provided in the post.

medium

Original description

AI-summarised, not from the leak post

N/A

The leak post

captured from the group's site

You have been placed in a queue, awaiting forwarding to the platform. 
Please do not refresh the page, you will be automatically redirected.

Sources

Victim siteCOBU-ARCH.COM
Leak posthttp://santat7kpllt6iyvqbr7q4amdv6dzrh6paatvyrzl7ry3zm72zigf4ad.onion/cobu-arch-com

Source

Indexed 4 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

February 7, 2026COBU-ARCH.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

Geographically, COBU-ARCH.COM is reported in Japan, a country with 108 ransomware disclosures in our corpus.

If your organisation is affected

A listing by clop means COBU-ARCH.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.