Quantum Ransomware
A data-only profile of Quantum, built from its leak-site claims: how much it posts, when, and who it goes after. We make no attribution claim on this page.
Claimed victims
67
Status
Quiet
Last 30 days
0
Top region
United States
Top sector
Professional Services
What the data says
Quantum ranks #63 of the 122 groups profiled here, with 67 claimed victims (0.3% of all claims we track).
Its earliest reliably dated claim in our data is 4 November 2021; the latest is 9 December 2022.
Its most-claimed sector is Professional Services, with no strong lean compared with other groups.
77% of its claims with a known country are in the United States.
Quantum activity, last 24 months
Claims per month, by the date our trackers first saw them, so batches can land late. We have almost no collection from June 2025 to March 2026: an empty stretch there means we weren't looking, not that the group was idle. The current month is partial.
Regions targeted
Sectors targeted
Sector and country come from the claim where it states one, otherwise from a rule or language-model label on the victim. Low-confidence sector labels are left out.
Related groups
Ransomware crews share affiliates, tooling, operators and targets; brands fall and reappear under new names. Related to:
Frequently asked questions
Is Quantum still active?
Quiet: no claims in our data since 9 December 2022.
How many victims has Quantum claimed?
We track 67 victims claimed by Quantum on its leak site. Claims are the group's own statements and are not independently verified.
Is Quantum sanctioned?
We don't record a specific sanctions designation for Quantum. That is not clearance: check current OFAC and UK lists, and take legal advice, before any payment is discussed.
What sectors and regions does Quantum target?
In our data Quantum most often hits Professional Services, and organisations in US, GB, DO, KW.
Where is Quantum believed to be based?
We don't publish an origin attribution for Quantum.
More analysis on the Ninja Labz blog, and new victims every morning in the Daily.
Track it daily
Ransomware moves every day. So does our paper.
The Probably Fine Daily is our morning threat-intelligence briefing — new victims, new groups, what actually matters, in plain English. Free.
Read today's Daily →Browse the archiveDefender-oriented threat intelligence. Nothing here assists an attack. Attribution and lineage reflect open-source reporting.