Quasar Listed by qilin Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
Quasar was listed by the qilin ransomware group on December 31, 2025, after internal files were exfiltrated in a ransomware attack. Individuals connected to Quasar should check whether their information was involved and take protective steps.
Breaking down the breach
The only confirmed public detail is the appearance of Quasar on the qilin ransomware leak site. The entry asserts that files were exfiltrated, but provides no information on the volume of data, the date of the intrusion, or the method used to gain access. No ransom demand amount or payment status has been disclosed, and the organization has not issued a statement confirming or denying the claims.
Who is qilin?
Qilin is a ransomware group that follows a double-extortion model: it encrypts systems and also removes copies of data before demanding payment. The group maintains a leak site where it lists organizations it claims to have compromised, often publishing samples or directories of files to pressure victims. Its operations have been documented across multiple sectors in recent years, with listings appearing regularly on its dedicated platform.
Who is Quasar?
Public detail on Quasar itself is limited. The organization appears on the leak site as a listed victim, indicating it maintains internal operational files that would be of interest in a ransomware incident. Organizations of this type routinely store records related to their business activities, though the precise nature of Quasar's work is not specified in available reporting on the listing.
The information in question
The listing refers only to “internal files” that were allegedly exfiltrated. No inventory of specific document types, databases, or personal information has been released by the group or confirmed by independent sources. Without additional disclosure, the exact contents of any exfiltrated material remain unconfirmed.
What's at stake
Exposure of internal files can reveal operational details, communications, or records that organizations normally keep private. For individuals whose information may be contained in those files, the primary risks involve potential misuse of any personal data that was present. For the organization, the incident adds pressure around data handling obligations and the need to assess what, if anything, was taken.
Were you affected?
Individuals can begin by monitoring official statements from Quasar for any guidance on the incident. Running a free exposure scan of an email address against known breach datasets provides one practical way to check whether personal information has appeared in previously published collections.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
More recent breaches
Willowdale Steeplechase Listed by qilin Ransomware GroupARO Listed by qilin Ransomware GroupCoreHQ Listed by qilin Ransomware GroupScenic Solutions Listed by qilin Ransomware GroupLatest breaches
Read GalaxyWarden’s full analysis of the Quasar Listed by qilin Ransomware Group →
Publicly posted by qilin — 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.