Clients allegedly used the hosting service to deploy ransomware viruses that infected around 400 networks around the world.
Ransomware attacks typically lock and encrypt the data on an organization's computers so they're unusable until the victim pays a fee.
His "100% privacy hosting" service was seized Tuesday by the IRS' Criminal Investigation unit and the Federal Bureau of Investigation.
Federal prosecutors have stepped up their efforts to curtail ransomware attacks.
WATCH: Ransomware attacks have surged 20%, CEO says
Persons:
Christopher Wray, Artur Grabowski's, Grabowski
Organizations:
Federal Bureau of, Capitol, IRS, Federal Bureau of Investigation, Justice Department
Locations:
Washington , U.S, Florida, Polish, U.S