Altus Group Listed by hive Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
The Altus Group Listed by hive Ransomware Group (reported December 18, 2021) is an unverified claim; the data involved is undisclosed belonging to roughly unknown people. If you have an account with them, your information may now be circulating on the open web and with data brokers. Here’s exactly what happened, how to check if you were affected, and what to do next.
Inside the incident
The only confirmed public detail is the listing itself. Hive placed Altus Group on its leak site and asserted that internal data had been removed. No date of intrusion, duration of access, volume of material, or encryption status has been disclosed by either the group or the organisation. The listing constitutes the group’s claim; independent verification of the data’s presence or authenticity has not been published.
The group behind it: hive
Hive is a ransomware-as-a-service operation that first appeared in mid-2021. It supplies affiliates with encryption tools and maintains a public leak site where stolen files are posted when negotiations fail. The group has targeted organisations in multiple sectors and typically follows a double-extortion pattern: data is copied before encryption, then used as leverage. Its infrastructure and tooling have been documented in public reporting by security researchers, though specific tactics employed against any single victim remain case-by-case.
Who is Altus Group?
Altus Group provides commercial real-estate intelligence, valuation, advisory and data services to property owners, investors and lenders. Companies in this sector routinely collect and store financial records, lease agreements, tenant information, appraisal reports and proprietary market datasets. A successful intrusion therefore carries the potential to expose both corporate records and information belonging to third-party clients and properties.
What data was at risk
The listing refers only to “internal files.” No inventory of document types, file counts or data categories has been released. Organisations of this kind commonly hold client financial details, property ownership records, contractual documents and employee information, yet the precise contents of any exfiltrated material remain unconfirmed.
Why it matters
Exposure of internal files can reveal business-sensitive information that affects competitive positioning, contractual obligations and regulatory compliance. Where personal data of employees, tenants or clients is present, individuals may face risks of identity misuse or targeted fraud. For the organisation, the incident adds operational disruption, potential legal exposure and the cost of investigation and remediation, even if the full extent of the data remains unknown.
If your data was in this claimed breach
Monitor financial and email accounts for unusual activity and consider placing fraud alerts with credit agencies. Review any passwords that may have been stored or reused and change them where necessary. Readers can run a free exposure scan of their email address against known breach datasets to determine whether their information appears in publicly reported incidents.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
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Read GalaxyWarden’s full analysis of the Altus Group Listed by hive Ransomware Group →
Publicly posted by hive — 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.