The auto retailer said phones and computers were affected after unauthorized access to business systems, while RansomHouse separately claimed Karl Chevrolet.
The nonprofit said stores remain open, but point-of-sale disruptions have forced cash-only purchases as an Interlock post appeared to identify the West Michigan affiliate.
A South Florida report said some locations could not process cards for days as a Qilin extortion claim surfaced, but Duffy’s had not publicly confirmed ransomware by Tuesday.
