Firesta Listed by Deadlock Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
On July 10, 2026, Firesta was listed by the Deadlock ransomware group following an attack in which internal files were exfiltrated. Individuals and organizations should check whether their information was exposed and take appropriate protective steps.
On July 10, 2026, the Deadlock ransomware group listed Firesta on its leak site, claiming to have exfiltrated internal files from the Czech construction company. The number of individuals whose information may be involved remains unknown, and no further details about the volume or contents of the material have been made public. For employees, partners, and clients connected to Firesta’s infrastructure projects, the incident raises the possibility that operational records held by the firm could now circulate outside its control.
Breaking down the breach
The only confirmed public information is the listing itself and the group’s statement that internal files were taken during a ransomware operation. No date for the intrusion, no count of affected records, and no description of the attack method have been disclosed. Firesta has not issued a statement confirming or denying the claims at the time of reporting.
Inside Deadlock
Deadlock is a ransomware group that follows the common pattern of encrypting systems and threatening to publish stolen data unless a ransom is paid. Like similar actors, it maintains a leak site where it lists organizations it claims to have targeted. The appearance of Firesta on that site constitutes the group’s assertion of involvement; independent confirmation of the underlying incident has not been reported.
Who is Firesta?
Firesta-Fišer, a.s. is a construction company founded in 1990 and headquartered in Brno, Czech Republic. It specializes in transport infrastructure such as bridges, roads, and railways, employs more than 600 people, and maintains operations in Slovakia, Poland, and Romania. Firms of this type routinely handle project documentation, supplier contracts, engineering specifications, and regulatory filings related to public works.
The information in question
The listing refers only to “internal files” taken in a ransomware attack. No inventory of specific data categories has been released. Construction companies typically store technical drawings, bidding materials, personnel records, financial documents, and correspondence with public authorities, yet the precise contents of any exfiltrated material remain unconfirmed.
Why it matters
Even without a confirmed record count, the exposure of internal files from an infrastructure contractor can affect project timelines, competitive information, and relationships with public-sector clients. Individuals whose details appear in those files—such as employees or subcontractors—face the standard risks associated with any leak of corporate records, including potential misuse for targeted fraud or further social-engineering attempts.
If your data was in this claimed breach
Monitor bank and email accounts for unusual activity and consider enabling multi-factor authentication on services linked to the company. Review any recent correspondence from Firesta for official guidance. Readers can also run a free exposure scan of their email address against known breach data to check for prior appearances in public listings.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
More recent breaches
FBC Listed by Deadlock Ransomware GroupUfoc Listed by Deadlock Ransomware GroupJoso Listed by Deadlock Ransomware GroupUFL Listed by Deadlock Ransomware GroupLatest breaches
Read GalaxyWarden’s full analysis of the Firesta Listed by Deadlock Ransomware Group →
Publicly posted by deadlock — unverified claim, pending independent verification
Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated assessment, not a definitive rating. Verification status is shown where available.
Attributions to threat groups and methods reflect public reporting and, in some cases, unverified claims made by the groups themselves; they may be incomplete or later revised. Recent Breaches and GalaxyWarden are independent and are not affiliated with, and do not endorse, any company or group named on this page. This information is aggregated from public sources for awareness only and is not legal, security, or investment advice.