Hanlon Electric Listed by sinobi Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

On December 22, 2025, the ransomware group sinobi listed Hanlon Electric on its leak site, claiming to have exfiltrated internal files from the Pittsburgh-based electrical contractor. Public information about the incident remains limited to this listing and a brief description of the data as internal files obtained during a ransomware attack. The number of individuals affected has not been disclosed, and no independent confirmation of the data’s contents or the circumstances of the intrusion has been made public.

Incidents involving claims of data exfiltration from contractors that support critical infrastructure sectors continue to appear on ransomware leak sites. Such listings draw attention because they can involve operational records, client information, and technical documentation that extend beyond the targeted company itself.

Breaking down the breach

The only confirmed public detail is the December 22, 2025 listing by sinobi. The group asserts that internal files were removed during a ransomware operation, but neither the date of the intrusion nor the volume or specific categories of data have been released. No statement from Hanlon Electric addressing the listing or any response actions has appeared in available reporting. The scale of exposure and whether any data was subsequently published remain undisclosed.

The group behind it: sinobi

Sinobi is a ransomware operation that maintains a leak site where it lists organizations it claims to have targeted. Like other groups in this category, it typically combines encryption of systems with the removal of data, then uses the threat of publication to pressure victims. Public records of the group’s activity show repeated listings of companies across multiple industries, with varying outcomes regarding whether claimed data is released. In this case, the listing of Hanlon Electric constitutes the group’s assertion; independent verification of the claimed exfiltration has not been reported.

Hanlon Electric and its sector

Hanlon Electric, established in 1930, operates as a full-service electrical contractor based in Pittsburgh. Its documented services include electrical construction, ongoing building maintenance, telecommunications work, and energy-efficiency projects. The company serves commercial, industrial, educational, and medical facilities, with an emphasis on minimizing operational downtime. Organizations of this type routinely hold project documentation, client specifications, maintenance records, and internal communications that can contain technical details about client sites.

Breaches affecting contractors in the electrical and facilities sector are noteworthy because their records often intersect with the operations of hospitals, schools, and manufacturing sites. Exposure of such material can create secondary effects for those client organizations even when the contractor itself is the direct target.

What was likely exposed

The listing refers only to “internal files exfiltrated in ransomware attack.” No further breakdown of file types, systems accessed, or data categories has been provided. Organizations in this sector commonly maintain employee records, client contracts, project drawings, equipment inventories, and correspondence. Whether any of these specific categories were involved cannot be confirmed from available information. The exact contents therefore remain unverified beyond the general description supplied in the listing.

What's at stake

For individuals whose information appears in contractor records, potential consequences include the misuse of contact details or project-related identifiers. For the company and its clients, the primary concerns are operational: the possible circulation of site-specific electrical layouts or maintenance procedures that could be referenced in future incidents. No evidence of follow-on misuse has been reported at this stage, and the practical impact depends on the nature of the files that were actually removed.

If your data was in this claimed breach

Begin by monitoring accounts associated with any email addresses or identifiers you have shared with contractors or service providers. Enable multi-factor authentication on those accounts and review recent login activity. If you receive unexpected communications referencing Hanlon Electric or related projects, treat them with caution and verify directly with the sender through known channels. Individuals can also run a free exposure scan of their email address against known breach data sets to determine whether their information has appeared in previously published collections.

AICompiled with AI assistance from public sources and published under our editorial standards.