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Ransomware Victim Technology

Mat Bao Corporation

Ransomware attack by Rhysida · Disclosed October 2, 2026 · 🇻🇳 Vietnam

Date Disclosed
Oct 2, 2026
2026
Threat Group
Rhysida
216 total victims
Country
🇻🇳 Vietnam
Industry
Technology

ThreatAI Analysis

Compiled from this incident record and the threat intelligence profile for Rhysida. Figures and technique mappings are quoted from the source data, not inferred.

Rhysida, a ransomware-as-a-service group that first appeared in May 2023, listed Mat Bao Corporation on its dark web leak site on October 2nd this year. The Vietnamese technology firm offers services like domain registration and cloud hosting.

About Mat Bao Corporation

Mat Bao Corporation 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. More

Source record: ransomware.live

About the Rhysida group

Rhysida is a ransomware-as-a-service (RAAS) group that emerged in May 2023. The group utilizes a namesake ransomware through phishing attacks and Cobalt Strike to breach the targets' networks and deploy their payloads. The group threatens to publicly distribute exfiltrated data if the ransom is not paid, and it's worth mentioning that Rhysida is still in the early stages of development. The ransomware leaves PDF notes in the affected folders, instructing victims to contact the group through its portal, and payment is made via Bitcoin. After encryption, the ransomware appends the extension '.ryshida' to encrypted files. Source: https://github.com/crocodyli/ThreatActors-TTPs Rhysida has listed 283 victims since June 2023.

How Rhysida is documented to operate

Phishing T1566 Initial Access

Adversaries may send phishing messages to gain access to victim systems. All forms of phishing are electronically delivered social engineering. Phishing can be targeted, known as spearphishing. In spearphishing, a specific individual, company, or industry will be targeted by the adversary. More generally, adversaries can conduct non-targeted phishing, such as in mass malware spam campaigns. Adversaries may send victims emails containing malicious attachments or links, typically to execute malicious code on victim systems. Phishing may also be conducted via third-party services, like social media platforms.

Mitigations: Network Intrusion Prevention, Restrict Web-Based Content, User Training, Antivirus/Antimalware, Software Configuration, Audit

MITRE ATT&CK reference →
Command and Scripting Interpreter T1059 Execution

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries. These interfaces and languages provide ways of interacting with computer systems and are a common feature across many different platforms. Most systems come with some built-in command-line interface and scripting capabilities, for example, macOS and Linux distributions include some flavor of Unix Shell while Windows installations include the Windows Command Shell and PowerShell. There are also cross-platform interpreters such as Python, as well as those commonly associated with client applications such as JavaScript and Visual Basic.

Mitigations: Restrict Web-Based Content, Limit Software Installation, Execution Prevention, Code Signing, Behavior Prevention on Endpoint, Privileged Account Management

MITRE ATT&CK reference →
Shared Modules T1129 Execution

Adversaries may execute malicious payloads via loading shared modules. Shared modules are executable files that are loaded into processes to provide access to reusable code, such as specific custom functions or invoking OS API functions (i.e., Native API). Adversaries may use this functionality as a way to execute arbitrary payloads on a victim system. For example, adversaries can modularize functionality of their malware into shared objects that perform various functions such as managing C2 network communications or execution of specific actions on objective. The Linux & macOS module loader can load and execute shared objects from arbitrary local paths.

Mitigations: Execution Prevention

MITRE ATT&CK reference →
Registry Run Keys / Startup Folder T1547.001 Persistence Privilege Escalation

Adversaries may achieve persistence by adding a program to a startup folder or referencing it with a Registry run key. Adding an entry to the "run keys" in the Registry or startup folder will cause the program referenced to be executed when a user logs in. These programs will be executed under the context of the user and will have the account's associated permissions level.

MITRE ATT&CK reference →
Process Injection T1055 Stealth Privilege Escalation

Adversaries may inject code into processes in order to evade process-based defenses as well as possibly elevate privileges. Process injection is a method of executing arbitrary code in the address space of a separate live process. Running code in the context of another process may allow access to the process's memory, system/network resources, and possibly elevated privileges. Execution via process injection may also evade detection from security products since the execution is masked under a legitimate process. There are many different ways to inject code into a process, many of which abuse legitimate functionalities.

Mitigations: Behavior Prevention on Endpoint, Privileged Account Management

MITRE ATT&CK reference →

MITRE ATT&CK techniques attributed to Rhysida across its recorded activity, not a finding about how Mat Bao Corporation was reached.

Vulnerabilities Rhysida is recorded exploiting

5 of these 5 are in the CISA Known Exploited Vulnerabilities catalog, 5 of them recorded by CISA as used in ransomware campaigns. CVEs attributed to Rhysida across its reported activity. There is no indication that any of these was involved in the Mat Bao Corporation incident — the source data does not record an entry point.

Incident Analysis

Mat Bao Corporation was targeted by Rhysida ransomware, one of the most active ransomware groups in our database with 216 confirmed victims globally. The attack was disclosed on October 2, 2026, when Mat Bao Corporation appeared on the group's dark web leak site.

Mat Bao Corporation is based in Vietnam , operating in the Technology sector. Vietnam ranks #40 globally for ransomware attacks, with 67 victims in our database.

Sector context: Technology companies hold intellectual property, customer data, and source code — all highly valuable assets. A successful ransomware attack can also put downstream customers at risk through supply chain exposure.

Rhysida typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats — paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Oct 3, 2026 16:00 UTC.

Frequently Asked Questions

Was Mat Bao Corporation attacked by ransomware?

Yes. Mat Bao Corporation was listed as a victim of the Rhysida ransomware group on October 2, 2026. The organisation is based in Vietnam and operates in the Technology sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Mat Bao Corporation?

Mat Bao Corporation was attacked by Rhysida ransomware. Rhysida is one of the most active ransomware groups, having claimed 216 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Mat Bao Corporation ransomware attack occur?

The ransomware attack on Mat Bao Corporation was disclosed on October 2, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Mat Bao Corporation ransomware attack?

The specific data stolen from Mat Bao Corporation has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Technology organisation, Mat Bao Corporation likely held source code, intellectual property, and customer data.

How can organisations protect against Rhysida attacks?

To defend against Rhysida and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.