Was quantinuum.com hit by ransomware?

quantinuum.com was listed by the ransomed ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the ransomed ransomware group?

ransomed is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the quantinuum.com breach?

ransomed published data attributed to quantinuum.com. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Quantinuum

listed as quantinuum.com · Claimed by Ransomed · listed 3 years ago

34m

Age

since listed · data leaked

Status timeline

ListedSep 4, 2023
Data leakeddate unknown

At a glance

Group: Ransomed
Status: Data leaked
Country: United States
Sector: Technology
Listed on leak site: Sep 4, 2023

About the victim

AI dossier — public-source company profile

Quantinuum is the world's largest integrated quantum computing company, formed from the merger of Honeywell Quantum Solutions and Cambridge Quantum. The company develops and sells quantum computers (System Model H1, H2, and Helios), quantum cybersecurity products (Quantum Origin), quantum chemistry simulation tools (InQuanto), and a full-stack quantum computing platform (Nexus). It serves commercial and research customers globally via on-premise and cloud-based hardware access.

Industry: Quantum Computing
Employees: 501-1000
Founded: 2021

Attack summary

Severity: critical — Quantinuum is a leading quantum computing company working on advanced cryptographic and national-security-relevant technologies; claimed exfiltration of databases and non-public documents from such a target represents a critical risk involving potentially regulated, proprietary, and strategically sensitive data with significant national security implications.

The group 'Ransomed' claims to have gained access to everything on Quantinuum's servers, including databases and non-public documents, with the disclosure status marked as data_published. No ransom amount or specific data volume has been stated.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Databases
Non-public internal documents
Server contents

What the group claims

we have access everything on their servers, including the Database, and other non public documents.

Sources

Victim sitequantinuum.com

Source

Indexed 3 years ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

Disclosure context

About ransomed

The ransomed ransomware group is a relatively new cybercriminal organization that emerged in August 2023, primarily motivated by financial gain through extortion activities targeting organizations across multiple countries. Based on their targeting patterns across Japan, Brazil, Russia, Great Britain, and Bulgaria, the group appears to operate internationally without clear geographic limitations, though their country of origin and potential affiliations with other ransomware groups remain undetermined due to limited public intelligence reporting. Given the recent emergence of this group and lack of detailed technical analysis from major security firms, their specific attack methodologies, initial access vectors, and encryption techniques have not been comprehensively documented in publicly available threat intelligence reports from CISA, FBI, or established security researchers. The group has claimed approximately 68 victims across their identified target countries since becoming active, though no specific high-profile campaigns or notable ransom demands have been publicly reported by law enforcement or security organizations. As of current reporting, the group appears to remain active with continued victim claims, though the limited public documentation suggests they operate as a lower-profile ransomware operation compared to more established and widely-tracked ransomware families. The group has been linked to 68 public disclosures across our corpus. First observed on a leak site on August 21, 2023; most recent post October 30, 2023. The operation is currently inactive.

Timeline of this disclosure

September 4, 2023quantinuum.com listed by ransomedon the group's public leak site

Other recent disclosures by ransomed

ransomed has been linked to 68 public victims on Darkfield. A sample of the most recent:

See the full ransomed dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,549 disclosures indexed across all operators we track. Geographically, quantinuum.com is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by ransomed means quantinuum.com appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on ransomed's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.