[ Ransomware claim · medusalocker · 4 Nov 2026 ]
On
The ransomware group medusalocker named On (Switzerland) on its leak site on 4 Nov 2026. This is the group's own claim: it has not been verified by Cyfenced or Ransomware.live, and some claims turn out to be exaggerated, recycled or false.
[ Status ]Has the attack been confirmed?
We have found no statement from On and no press report of an attack so far. Until the organisation says something, treat the listing as an unproven claim, but stay alert to the phishing such claims are used for.
[ Impact ]Who could be affected
Shoppers can face order delays and phishing that uses their order history, and online shops hold names, addresses and sometimes payment data.
[ The attacker ]About medusalocker
medusalocker has claimed 18 organisations in the last 30 days, most in United States, Colombia and India, and mostly in technology, manufacturing and professional services. We wrote about the group in Fifty victims in a day, two hosting breaches and town halls offline.
medusalocker on Ransomware.live
Other organisations medusalocker has named
- United States
- Colombia
- India
[ What to do ]If you are a customer, partner or neighbour
- Be wary of emails, calls and texts that mention the organisation, especially ones asking you to pay, log in or open an attachment. Criminals use leak-site claims to make phishing believable.
- Check announcements on the organisation's own website or official channels, not on social media reposts.
- If you share accounts or systems with the organisation, change those passwords and check for unusual logins.
- Never visit leak sites or download files claimed to come from the attack: they can contain malware, and handling stolen personal data can be illegal.
[ Similar claims ]Other retail & e-commerce organisations in Switzerland
- qilin
- payload