Disclosure context

About stormous

Stormous is a relatively new ransomware group that emerged in March 2022, operating primarily with financial motivations and has claimed responsibility for attacks against at least 165 victims across multiple countries and sectors. The group's country of origin remains unclear from publicly documented sources, though their operational patterns suggest they may operate as an independent entity rather than a established ransomware-as-a-service model. Limited public documentation from major security firms indicates the group employs common ransomware tactics, though specific details about their initial access vectors, encryption methods, and data exfiltration practices have not been extensively detailed in reports from CISA, FBI, or major threat intelligence providers. Their targeting appears geographically diverse with a focus on Spain, the United States, France, UAE, and Brazil, while showing particular interest in technology, hospitality and tourism, government, and business services sectors, though many of their victims span unspecified industries. As of current reporting, Stormous appears to remain an active threat, though the limited public documentation suggests they operate as a lower-tier ransomware group compared to more prominent families that receive extensive coverage from major security research organizations. The group has been linked to 220 public disclosures across our corpus. First observed on a leak site on March 22, 2022; most recent post May 13, 2026. The operation is currently active.

Timeline of this disclosure

May 10, 2026ams-group.co.uk FULL DATA DUMP 33GB listed by stormouson the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 2,640 disclosures indexed across all operators we track. Geographically, ams-group.co.uk FULL DATA DUMP 33GB is reported in GB, a country with 309 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

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ams-group.co.uk FULL DATA DUMP 33GB

Claimed by stormous · listed 11 days ago

11d

Age

since listed · data leaked

Status timeline

Listed
May 10, 2026
Data leaked

At a glance

Group: stormous
Status: Data leaked
Country: GB
Sector: Business Services
Listed on leak site: May 10, 2026

About the victim

AI dossier — public-source company profile

AMS Group (ams-group.co.uk) is a UK-based business operating in the engineering and construction sector, as inferred from the nature of the exfiltrated data which includes architectural designs, engineering reports, construction site maps, and technical specifications. The company provides business and professional services likely encompassing project management, consultancy, or related engineering disciplines. No public site content was available to confirm further operational details.

Industry: Engineering & Construction Consultancy

Attack summary

Severity: high — The group claims confirmed exfiltration and full publication of 33 GB of data including payroll sheets, employee records, financial records, contracts, and legal/tax information, constituting significant business and personnel data exposure. While regulated PII at large scale is implied (payroll, employee records), the exact volume of affected individuals is unknown, placing this at high rather than critical.

Stormous claims to have exfiltrated a full data dump of approximately 33 GB from AMS Group, encompassing administrative, financial, payroll, HR, legal, and technical engineering records. The data has been published (disclosed status: data_published) with no ransom amount stated.

high

Data the group says was taken

AI dossier — extracted from the leak post

Administrative records
Financial records
Payroll sheets
Client directories
Partner directories
Employee records
Technical and engineering specifications
Business plans
Architectural designs
Official contracts
Detailed engineering reports
Construction site maps
Risk assessments
Internal correspondence
Tax information
Legal information

What the group claims

The extracted data comprises administrative and financial records, payroll sheets, and client and partner directories, alongside technical and engineering specifications, employee records, and business plans. It also includes architectural designs, official contracts, detailed engineering reports, and construction site maps, as well as risk assessments, internal correspondence, and tax and legal information.

Source

Indexed 11 days 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.