Was stm.com.tw hit by ransomware?

stm.com.tw was listed by the Cuba ransomware operation (Taiwan), 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 Cuba ransomware group?

Cuba 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 stm.com.tw breach?

Cuba published data attributed to stm.com.tw. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

STM

listed as stm.com.tw · Claimed by Cuba · listed 4 years ago

44m

Age

since listed · data leaked

Status timeline

ListedNov 4, 2022
Data leakeddate unknown

At a glance

Group: Cuba
Status: Data leaked
Country: Taiwan
Sector: Manufacturing
Listed on leak site: Nov 4, 2022

About the victim

AI dossier — public-source company profile

STM (stm.com.tw) is a Taiwan-based manufacturing company operating under the domain stm.com.tw. Based on the sector classification and domain, the company appears to be engaged in manufacturing operations in Taiwan. No further detail is available from the leak post or public site content.

Industry: Manufacturing

Attack summary

Severity: medium — Data is marked as published by the Cuba group, indicating confirmed exfiltration and release; however, no details on the type, scale, or sensitivity of the data are available, preventing a higher severity classification.

The Cuba ransomware group has claimed an attack against STM, with the disclosure status recorded as data_published, indicating that data has been released. No further details on the nature of the exfiltrated or encrypted data are available from the captured leak post.

medium

Sources

Victim sitestm.com

Source

Indexed 4 years 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 Cuba

The Cuba ransomware group is a financially-motivated cybercriminal organization that emerged in February 2021 and has since conducted attacks against at least 105 known victims globally. The group operates as an independent ransomware operation with suspected ties to Russian-speaking cybercriminals, though their exact country of origin remains unconfirmed by law enforcement agencies. Cuba ransomware operators primarily gain initial access through compromised Remote Desktop Protocol (RDP) credentials, exploitation of Microsoft Exchange vulnerabilities, and phishing campaigns, subsequently deploying their custom Cuba ransomware payload which encrypts victim files while exfiltrating sensitive data before encryption as part of their double extortion strategy. The group has particularly targeted organizations in the United States, United Kingdom, France, Australia, and Belgium, with a notable focus on critical infrastructure sectors including healthcare, financial services, manufacturing, and energy companies. According to FBI reporting, the Cuba ransomware group has demanded ransom payments ranging from hundreds of thousands to millions of dollars from their victims. As of recent threat intelligence assessments, the Cuba ransomware group remains active and continues to pose a significant threat to organizations across multiple sectors and geographic regions. The group has been linked to 105 public disclosures across our corpus. First observed on a leak site on February 3, 2021; most recent post February 1, 2024. The operation is currently inactive.

Also tracked as: COLDDRAW, Fidel.

Timeline of this disclosure

November 4, 2022stm.com.tw listed by Cubaon the group's public leak site

Other recent disclosures by Cuba

Cuba has been linked to 105 public victims on Darkfield. A sample of the most recent:

See the full Cuba 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, stm.com.tw is reported in Taiwan, a country with 71 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Cuba means stm.com.tw 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 Cuba'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.