Was Mat Bao Corporation hit by ransomware?

Mat Bao Corporation was listed by the Rhysida ransomware operation (Vietnam) 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 Rhysida ransomware group?

Rhysida 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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Mat Bao Corporation

Claimed by Rhysida · listed 3 hours ago

106.8 GB

Data size

746108 records

Today

Age

since listed · listed for ransom

Status timeline

ListedOct 3, 2026

Current state: Listed for ransom

At a glance

Group: Rhysida
Status: Listed for ransom
Country: Vietnam
Sector: Technology/Hosting
Listed on leak site: Oct 3, 2026
Data size: 106.8 GB
Records: 746108

About the victim

AI dossier — public-source company profile

Mat Bao Corporation is a Vietnamese technology/hosting company offering domain registration, cloud hosting, professional email solutions, and cloud server storage services.

Industry: Domain Registration & Cloud Hosting

Attack summary

Severity: critical — Confirmed exfiltration of regulated sensitive data including government inspection materials, national ID documents, employee personal identification, and correspondence with Vietnamese regulatory bodies (NEAC, Government Cipher Committee). Scale of 106.8 GB with 746K files involving government agency interactions and cryptographic infrastructure vulnerabilities.

Rhysida claims to have exfiltrated 746,108 files totaling 106.8 GB from Mat Bao Corporation, including government inspection materials, business registration documents, employee personal data (national ID cards and passports), and sensitive regulator correspondence with Vietnamese authorities.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Government inspection materials (NEAC decisions)
Business registration documents (GPKD) with owner signatures
Shareholder records
Tax commitments
Employee national ID cards (CCCD)
Employee passports
Staff lists
Regulator correspondence (VNNIC, NEAC, Government Cipher Committee)
Litigation records (VINASEED dispute)
Operations department email

What the group claims

Mat Bao Corporation offers a range of services including domain registration, cloud hosting, professional email solutions, and cloud server storage.

The leak post

captured from the group's site

Mat Bao Corporation offers a range of services including domain registration, cloud hosting, professional email solutions, and cloud server storage. Files: 746,108Data volume: 106.8 GBGovernment inspection materials - NEAC inspection decision No. 61/QD (29.04.2025) against the certification authority, working minutes naming state inspectors and company staff (through December 2025).Corporate core - GPKD business-registration documents bearing the owner's signature, shareholder records, tax commitments (January 2026).Personal data - national ID cards (CCCD) and employee passports with signatures, staff lists.Regulator correspondence - VNNIC, NEAC, the Government Cipher Committee (including RSA-1024 token vulnerabilities).Litigation and operations - the VINASEED dispute, internal investigations, operations-department mail.
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ElectroHeat industrial furnaces are used in manufacturing industries all over the world.Files: 1,723,527Data volume: 2,55 TBAll intellectual p…

Data the group says was taken

government inspection materials
business registration documents
shareholder records
tax documents
national ID cards
passports
staff lists
regulator correspondence
litigation documents
internal investigations
email

Screenshot of the leak post

Sources

Leak posthttp://rhysidafc6lm7qa2mkiukbezh7zuth3i4wof4mh2audkymscjm6yegad.onion

Source

Indexed 3 hours 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 Rhysida

Rhysida is a ransomware group that emerged in June 2023, operating with primarily financial motivations through targeted attacks against critical infrastructure and public sector organizations. The group's origin and potential state affiliations remain unclear, though they operate independently rather than as a traditional Ransomware-as-a-Service model, with limited public documentation regarding connections to other cybercriminal organizations. Rhysida employs double extortion tactics, typically gaining initial access through compromised VPN credentials and exploiting vulnerable public-facing applications before deploying their ransomware payload and exfiltrating sensitive data prior to encryption. The group has demonstrated a particular focus on healthcare and educational institutions, with notable attacks documented by CISA and FBI advisories highlighting their targeting of hospitals and school districts across multiple countries, resulting in significant operational disruptions to critical services. As of late 2024, Rhysida remains an active threat with continued operations targeting organizations primarily in the United States, Canada, and other Western nations, maintaining their focus on high-value sectors where operational disruption can maximize ransom payment likelihood. The group has been linked to 366 public disclosures across our corpus. First observed on a leak site on June 5, 2023; most recent post October 3, 2026. The operation is currently active.

Timeline of this disclosure

October 3, 2026Mat Bao Corporation listed by Rhysida on the group's public leak site

Data size: 106.8 GB
Records: 746108

Other recent disclosures by Rhysida

Rhysida has been linked to 366 public victims on Darkfield. A sample of the most recent:

See the full Rhysida dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology/Hosting sector. Geographically, Mat Bao Corporation is reported in Vietnam, a country with 14 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Rhysida means Mat Bao Corporation 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 Rhysida'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.