Was ACMARK s r o hit by ransomware?

ACMARK s r o was listed by the beast ransomware operation (Czech Republic) as a victim being extorted; data had not been published at the time of listing. 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.

Ransomware victim disclosure

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ACMARK s r o

Claimed by Beast · listed 2 months ago

$23.83

Ransom

demanded

56d

Age

since listed · listed for ransom

Status timeline

ListedMay 20, 2026

Current state: Listed for ransom

At a glance

Group: Beast
Status: Listed for ransom
Country: Czech Republic
Sector: Repair Services
Listed on leak site: May 20, 2026
Ransom demanded: $23.83

About the victim

AI dossier — public-source company profile

ACMARK s.r.o. is a small repair services company headquartered in Brno, South Moravian Region, Czech Republic. It employs between 10 and 19 people and generates annual revenue in the range of 1M to 5M (currency unspecified, likely CZK or EUR). No further operational details are publicly available.

Industry: Repair Services
Address: Brno, South Moravian, Czech Republic
Employees: 10-19

Attack summary

Severity: low — Only a listing/announcement with no proof files, no stated data exfiltration, no ransom amount, and no description of operational impact or sensitive data categories disclosed.

The Beast ransomware group has listed ACMARK s.r.o. as a victim, claiming an attack on the company. No specific details regarding encryption, exfiltration, or data types at stake have been provided in the post.

low

What the group claims

ACMARK s r o is a company that operates in the Repair Services industry. It employs 10 to 19 people and has 1M to 5M of revenue. The company is headquartered in Brno, South Moravian, Czech Republic.

The leak post

captured from the group's site

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.

Screenshot of the leak post

Sources

Leak posthttp://beast6azu4f7fxjakiayhnssybibsgjnmy77a6duufqw5afjzfjhzuqd.onion/card/acmark

Source

Indexed 2 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 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

May 20, 2026ACMARK s r o 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 Repair Services sector. Geographically, ACMARK s r o is reported in Czech Republic, a country with 34 ransomware disclosures in our corpus.

If your organisation is affected

A listing by beast means ACMARK s r o appeared on a ransomware extortion site and is being pressured to pay before any publication. 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.