Was ACMARK hit by ransomware?

ACMARK was listed by the apos ransomware operation (??), 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 apos ransomware group?

apos 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?

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

Ransomware victim disclosure

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ACMARK s.r.o.

listed as ACMARK · Claimed by Apos · listed 11 months ago

11m

Age

since listed · data leaked

Status timeline

ListedAug 15, 2025
Data leakeddate unknown

At a glance

Group: Apos
Status: Data leaked
Country: ??
Listed on leak site: Aug 15, 2025

About the victim

AI dossier — public-source company profile

ACMARK s.r.o. is a Czech consulting firm established in 2009 that specializes in process management, CRM systems, document management, and business intelligence. They provide implementation and consulting services for enterprise platforms including Dynamics 365, SharePoint, SugarCRM, and related Microsoft Office 365 tools, serving major Czech and international companies.

Industry: Business Process Management & CRM Consulting
Address: Lidická 2030/20, 602 00 Brno, Czech Republic
Founded: 2009

Attack summary

Severity: low — No proof files or screenshots are advertised in the truncated leak post. No data types, volumes, or operational impact are specified. The disclosure appears to be an announcement only.

The apos group claims to have compromised ACMARK s.r.o. The leak post does not specify whether data was exfiltrated, encrypted, or both, nor does it detail what data categories are at stake.

low

What the group claims

ACMARK s.r.o. was established in 2009 and its mission is to provide high-quality consulting services designed to support the marketing and business processes in organizations. To support these activities and processes our company supplies globally tested information technology which helps our customers successfully develop their own activities and reach the maximum possible profitability.

Sources

Source

Indexed 11 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 apos

The apos ransomware group is a relatively new threat actor that emerged in April 2024, primarily motivated by financial gain through ransomware operations targeting organizations across multiple countries and sectors. Given their recent emergence and limited public documentation, their country of origin and affiliations with other ransomware groups remain unknown, though their targeting pattern suggests they may operate independently rather than as part of a larger ransomware-as-a-service ecosystem. Based on available data, the group has successfully compromised 16 known victims across Brazil, the United States, Argentina, Canada, and France, with a particular focus on technology, healthcare, business services, and manufacturing sectors, though their attack methodology and specific tools remain undocumented by major threat intelligence firms. No notable high-profile campaigns or major ransom payments have been publicly reported by CISA, FBI, Mandiant, or other reputable security researchers, likely due to the group's recent emergence and relatively small victim count. The group appears to remain active as of current reporting, though their limited public footprint suggests they are either a smaller operation or have managed to maintain a low profile in the threat landscape. The group has been linked to 16 public disclosures across our corpus. First observed on a leak site on April 29, 2024; most recent post August 15, 2025. The operation is currently inactive.

Timeline of this disclosure

August 15, 2025ACMARK listed by aposon the group's public leak site

Other recent disclosures by apos

apos has been linked to 16 public victims on Darkfield. A sample of the most recent:

See the full apos dossier →

Sector and geography

Geographically, ACMARK is reported in ??.

If your organisation is affected

A listing by apos 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 apos'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.