Was Cosmon hit by ransomware?

Cosmon was listed by the beast 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 beast ransomware group?

beast 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 Cosmon breach?

beast published data attributed to Cosmon. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Cosmon

Claimed by Beast · listed 2 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedAug 25, 2026
Data leakeddate unknown

At a glance

Group: Beast
Status: Data leaked
Country: United States
Sector: Technology
Listed on leak site: Aug 25, 2026

About the victim

AI dossier — public-source company profile

Cosmon develops agentic AI software for mechanical engineering workflows, centered on its Nexus product. The platform automates CAD, CAE, simulation, and product lifecycle management tasks while integrating with major engineering tools.

Industry: Artificial Intelligence & Engineering Software

Attack summary

Severity: medium — Data exfiltration claimed by group with public disclosure, but no specific data inventory, proof files, or sensitive data categories are detailed in the post. No operational impact stated.

The beast group claims to have compromised Cosmon and exfiltrated data. No specific data types or operational details are disclosed in the leak post.

medium

What the group claims

Cosmon develops agentic artificial intelligence software for mechanical engineering workflows, centered on its Nexus product for CAD, CAE, simulation, and PLM tasks. Its website presents the company as a software provider whose platform automates drawing creation, simulation setup, troubleshooting, design validation, and product lifecycle data tasks while integrating directly with major engineering tools. Although the offering is deeply technical and tailored to engineering environments, the core business shown is the development and delivery of proprietary engineering software rather than providing outsourced engineering services or general consulting. https://cosmon.com https://www.zoominfo.com/c/cosmon/5000578320

The leak post

captured from the group's site

Cosmon develops agentic artificial intelligence software for mechanical engineering workflows, centered on its Nexus product for CAD, CAE, simulation, and PLM tasks. Its website presents the company as a software provider whose platform automates drawing creation, simulation setup, troubleshooting, design validation, and product lifecycle data tasks while integrating directly with major engineering tools. Although the offering is deeply technical and tailored to engineering environments, the core business shown is the development and delivery of proprietary engineering software rather than providing outsourced engineering services or general consulting.
partner: Session 054bb52b3a6aad9bb1d17811162de616c71886deda7ae2d1b708a4fe8f8fc34259 | [email protected] | [email protected]

Sources

Victim sitewww.cosmon.com
Leak posthttp://beast6azu4f7fxjakiayhnssybibsgjnmy77a6duufqw5afjzfjhzuqd.onion/card/cosmon

Source

Indexed 2 hours 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 beast

The Beast ransomware group is a relatively new threat actor that emerged in July 2025, operating with apparent financial motivations through their ransomware campaigns. With limited public documentation available from major security agencies, the group has demonstrated activity primarily targeting victims across the United States, United Kingdom, Brazil, South Korea, and Argentina, accumulating approximately 65 known victims since their emergence. Their targeting pattern shows a focus on healthcare organizations, manufacturing companies, educational institutions, and construction firms, suggesting an opportunistic approach rather than highly specialized sector expertise. The group's recent emergence means there is insufficient public intelligence from CISA, FBI, Mandiant, or other established security researchers regarding their specific attack methodologies, initial access vectors, or technical capabilities. Given the timeline of their first observation in mid-2025, Beast represents an active and emerging threat with their current operational status remaining unclear due to limited threat intelligence reporting from authoritative sources. The group has been linked to 106 public disclosures across our corpus. First observed on a leak site on July 29, 2025; most recent post August 25, 2026. The operation is currently active.

Timeline of this disclosure

August 25, 2026Cosmon listed by beaston the group's public leak site

Other recent disclosures by beast

beast has been linked to 106 public victims on Darkfield. A sample of the most recent:

See the full beast dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,573 disclosures indexed across all operators we track. Geographically, Cosmon is reported in United States, a country with 3,164 ransomware disclosures in our corpus.

If your organisation is affected

A listing by beast means Cosmon 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.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on beast'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.