Disclosure context

About tengu

Tengu is a recently emerged ransomware group first observed in October 2025, operating with apparent financial motivations and demonstrating a geographically diverse targeting approach across 49 documented victims. The group has primarily focused their operations on Morocco, the United States, India, Italy, and Indonesia, suggesting either opportunistic targeting or specific interest in these regions' economic sectors. Their victim profile spans multiple industries including technology, manufacturing, public sector, and agriculture and food production, indicating a broad targeting strategy rather than sector-specific focus. Due to the group's recent emergence and limited public documentation from established threat intelligence sources, specific details regarding their origin, affiliation status, technical methodology, encryption techniques, and operational structure remain largely undocumented by major cybersecurity agencies and research organizations. No notable high-profile campaigns or law enforcement actions have been publicly reported by CISA, FBI, or prominent security researchers at this time. The group's current operational status appears active given their recent emergence, though comprehensive threat intelligence profiles from established sources have yet to be published due to their nascent presence in the ransomware landscape. The group has been linked to 57 public disclosures across our corpus. First observed on a leak site on October 23, 2025; most recent post May 21, 2026. The operation is currently active.

Timeline of this disclosure

February 4, 2026megasilver.com.tw listed by tenguon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, megasilver.com.tw is reported in TW, a country with 46 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

Megasilver Information System Co., Ltd.

listed as megasilver.com.tw · Claimed by tengu · listed 4 months ago

Age

since listed · data leaked

Status timeline

Listed
Feb 4, 2026
Data leaked

At a glance

Group: tengu
Status: Data leaked
Country: TW
Sector: Not Found
Listed on leak site: Feb 4, 2026

About the victim

AI dossier — public-source company profile

Megasilver Information System Co., Ltd. (兆銀資訊系統股份有限公司) is a Taiwanese IT services and software development company founded in 1994. The company specializes in digital service solutions and intelligent operating systems, with products targeting financial institutions (queue management, exchange rate digital signage, mobile teller) and healthcare providers (inpatient self check-in systems, clinic mobile apps, telemedicine, and payment kiosks). It holds ISO 27001 certification and positions itself as a trusted technology partner in Taiwan.

Industry: IT Services & Healthcare/Financial Digital Solutions
Founded: 1994

Attack summary

Severity: high — Data is marked as published (confirmed exfiltration and public release). The company serves healthcare and financial sector clients, meaning exfiltrated data may include sensitive client system information or patient/financial institution data; the 'disclosed status: data_published' confirms actual data release rather than a mere listing.

The Tengu ransomware group claims to have published data belonging to Megasilver Information System Co., Ltd., with the post marked as 'PUBLISHED' indicating exfiltrated data has been released. No specific ransom amount or data volume is stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Business/operational data
Software development assets
Client system configurations
Internal company documents

What the group claims

Megasilver Information System Co., Ltd. (Chinese: 兆銀資訊系統股份有限公司) is a Taiwanese company engaged in information technology services and software system development, especially in digital service solutions and intelligent operating systems.

The leak post

captured from the group's site

Shisa Ransomware Blog Shisa RANSOMWARE DATA LEAKS BLOG HOME AFFILIATE PROGRAM CONTACT crown-security.com.tw PUBLISHED Crown Security is a technology company specializing in information security and digital systems, offering advanced solutions to protect corporate networks and data from breaches and cyberattacks The company focuses on providing security consulting and implementing integrated protection systems tailored to each organization's needs 27,470 👁 Sileno Companies Inc PUBLISHED Sileno Companies Inc. A US company primarily operating in the hospitality and real estate sectors, its activities include: Hotel operation Property management Management of hotels' restaurants and bars Hospitality project development 22.9TB was encrypted in 14 hours on 3/5/2026 More than 67.07 GB was extracted 29,787 👁 Eos Technology srl PUBLISHED Eos Technology srl is a company with 15 years of experience in the ICT sector, initially starting as an assembly and repair laboratory for PCs and peripherals. Over time, it has developed expertise that has allowed it to become a partner of various international brands. The company offers a range of services including IT assistance, multimedia services, h…

Sources

Source

Indexed 4 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.