Was ACMARK hit by ransomware?

ACMARK was listed by the beast ransomware operation (Czechia), 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 ACMARK breach?

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

Ransomware victim disclosure

← All victims

ACMARK s.r.o.

listed as ACMARK · Claimed by Beast · listed 1 year ago

$23.83

Ransom

demanded

11m

Age

since listed · data leaked

Status timeline

ListedJul 29, 2025
Data leakeddate unknown

At a glance

Group: Beast
Status: Data leaked
Country: Czechia
Sector: Manufacturing
Listed on leak site: Jul 29, 2025
Ransom demanded: $23.83

About the victim

AI dossier — public-source company profile

ACMARK s.r.o. is a Czech IT consulting and software services company based in Brno specializing in business process management, CRM systems, document management, and business intelligence solutions. They partner with major Czech and international companies, offering implementations and consulting around platforms including Dynamics 365, SharePoint, SugarCRM, and Office 365.

Industry: Business Process Management & CRM Services
Address: Lidická 2030/20, 602 00 Brno, Czech Republic
Employees: 10-19

Attack summary

Severity: medium — Data published status with no explicit proof count or data size stated; company is mid-sized IT services firm (10-19 employees) handling business and client data; no confirmed regulated data (PII, medical, financial) explicitly mentioned, but CRM/document systems likely contain business-sensitive information.

The Beast ransomware group claims to have published data from ACMARK following an attack. The post does not explicitly detail the scope of encryption or exfiltration, but marks the victim as 'data_published' status.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Business systems data
Client information
CRM/ERP records
Document management files

What the group claims

ACMARK s r o is a company that operates in the Repair Services industry. It employs 10to19 people and has 1Mto5M of revenue. The company is headquartered in Brno, South Moravian, Czech Republic.

The leak post

captured from the group's site

[ 2fORM Architecture specializes in innovative sustainable architecture, offering design services for residential, commercial, and interior projects. Their portfolio includes a diverse range of developments, such as multi-family housing, health care facilities, and various remodels. The company aims to serve clients in the Pacific Northwest, including individual homeowners, businesses, and institutions. With a commitment to sustainability and creativity, 2fORM Architecture enhances the built environment through thoughtful design. ](http://beast6azu4f7fxjakiayhnssybibsgjnmy77a6duufqw5afjzfjhzuqd.onion/card/2form_architecture)[ ACMARK s r o is a company that operates in the Repair Services industry. It employs 10to19 people and has 1Mto5M of revenue. The company is headquartered in Brno, South Moravian, Czech Republic. ](http://beast6azu4f7fxjakiayhnssybibsgjnmy77a6duufqw5afjzfjhzuqd.onion/card/acmark)[ AJU Pharm Co., Ltd. is a prominent South Korean total healthcare company founded in 1953. For over 70 years, it has evolved from a manufacturer of raw materials into a global pharmaceutical group specializing in prescription drugs, medical devices, and health supplements P U B L I S H…

Screenshot of the leak post

Sources

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

Source

Indexed 1 year 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 104 public disclosures across our corpus. First observed on a leak site on July 29, 2025; most recent post June 11, 2026. The operation is currently active.

Timeline of this disclosure

July 29, 2025ACMARK listed by beaston the group's public leak site

Ransom demanded: $23.83

Other recent disclosures by beast

beast has been linked to 104 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 Manufacturing sector, which has 3,681 disclosures indexed across all operators we track. Geographically, ACMARK is reported in Czechia, a country with 15 ransomware disclosures in our corpus.

If your organisation is affected

A listing by beast means ACMARK 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 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.