Was Hollysys Asia Pacific hit by ransomware?

Hollysys Asia Pacific was listed by the crypto24 ransomware operation (Singapore), 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 crypto24 ransomware group?

crypto24 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 Hollysys Asia Pacific breach?

crypto24 published data attributed to Hollysys Asia Pacific. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Hollysys Asia Pacific

Claimed by Crypto24 · listed 8 months ago

Age

since listed · data leaked

Status timeline

ListedDec 1, 2025
Data leakeddate unknown

At a glance

Group: Crypto24
Status: Data leaked
Country: Singapore
Sector: Technology
Listed on leak site: Dec 1, 2025

About the victim

AI dossier — public-source company profile

Hollysys Asia Pacific is the regional arm of Hollysys Automation Technologies Ltd, a leading provider of industrial automation and rail transportation automation solutions headquartered in China and operating across Asia. The company supplies distributed control systems, safety instrumented systems, PLC and turbine/compressor control systems, as well as digital rail signalling and urban transit control products. It also serves the food and pharmaceutical sectors with packaging and dispensing automation and digital factory solutions.

Industry: Industrial & Rail Transportation Automation
Employees: 1001-5000
Founded: 1993

Attack summary

Severity: high — Data has been published by the threat actor against a company operating in critical infrastructure sectors (industrial automation and rail transportation signalling). Compromise of such an organisation carries significant risk of exposure of sensitive engineering, operational, and potentially safety-critical system data, warranting a high severity rating even absent detailed proof inventory.

The crypto24 ransomware group claims to have compromised Hollysys Asia Pacific and has published data (disclosed status: data_published); the leak post does not specify whether encryption, exfiltration, or both occurred, nor does it state the volume of data stolen.

high

Data the group says was taken

AI dossier — extracted from the leak post

Corporate business data
Operational/engineering documents
Potentially industrial control system configurations
Employee or organisational records

Original description

AI-summarised, not from the leak post

Hollysys Asia Pacific is part of Hollysys Automation Technologies Ltd, a leading provider of industrial and rail transportation automation solutions. Its core businesses include industrial automation, rail transportation, and mechanical and electrical solutions. The company utilizes advanced technologies in industrial automation and control, digital rail signaling, and mechanical and electrical solutions to address modern industrial operations and infrastructure requirements.

Sources

Victim sitewww.hollysys.com

Source

Indexed 8 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 crypto24

Crypto24 is a recently emerged ransomware group first observed in April 2025, with a primary financial motivation evidenced by their targeting of high-value sectors across multiple geographic regions. The group's origin and affiliations remain unclear due to their recent emergence, though their targeting pattern suggests either independent operations or a new ransomware-as-a-service offering given the diverse geographic spread of their 43 documented victims. Their attack methodology and specific technical capabilities have not yet been thoroughly documented by major threat intelligence providers, though their targeting of technology, financial services, healthcare, and business services sectors indicates they likely employ common initial access vectors such as phishing or exploitation of public-facing applications to gain entry into victim networks. The group has demonstrated a preference for targeting organizations primarily in the United States while also conducting operations across Southeast Asia including Malaysia, Singapore, and Indonesia, as well as extending their reach to Egypt, suggesting either a globally distributed affiliate network or opportunistic targeting based on vulnerable infrastructure discovery. Crypto24 remains active as of the latest available intelligence reporting, though given their recent emergence, comprehensive details about their specific tactics, techniques, and procedures await further analysis by established cybersecurity research organizations. The group has been linked to 49 public disclosures across our corpus. First observed on a leak site on April 8, 2025; most recent post May 18, 2026. The operation is currently active.

Timeline of this disclosure

December 1, 2025Hollysys Asia Pacific listed by crypto24on the group's public leak site

Other recent disclosures by crypto24

crypto24 has been linked to 49 public victims on Darkfield. A sample of the most recent:

See the full crypto24 dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,549 disclosures indexed across all operators we track. Geographically, Hollysys Asia Pacific is reported in Singapore, a country with 45 ransomware disclosures in our corpus.

If your organisation is affected

A listing by crypto24 means Hollysys Asia Pacific 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, SingCERT (Singapore), as required for your jurisdiction.
Monitor for the data appearing on crypto24'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.