ransomware

noun

ran·​som·​ware ˈran(t)-səm-ˌwer 

: malware that requires the victim to pay a ransom to access encrypted files

In September of 2013, security for small accounting offices changed forever with the appearance of a new class of threats called ransomware. … you open a file attached to an innocent-looking e-mail, and the program encrypts key files and drives so they cannot be accessed. The files are locked until you pay a ransom.

—Dave Mcclure

With ransomware, a hacker slips into a system, then puts encryption controls in place that locks users out. The hackers then demand money to "unlock" the data.

—Elizabeth Millard

Today's ransomware scammers often demand payment in bitcoin because the digital currency is easy to use, fast and provides a heightened anonymity for the scammers, according to the FBI warning.

—Susan Tompor

Examples of ransomware in a Sentence

Recent Examples on the Web

Many ransomware hackers are based in Russia, and the Kremlin is unlikely to extradite any of them. —Sam Sabin, Axios, 11 Feb. 2025

Each adds protective layers specific to detecting ransomware behavior. —PCMAG, 9 Feb. 2025

In a statement posted to its website Wednesday, the blood center said hackers attacked it with ransomware Sunday, significantly reducing its operations. —Kevin Collier, NBC News, 31 Jan. 2025

Data from Comparitech reveals a record-breaking 121 successful ransomware attacks against U.S. schools in 2023, compared to 71 the previous year, costing these educational institutions $550,000 per day of downtime. —Darren Guccione, Forbes, 21 Jan. 2025

Word History

First Known Use

2005, in the meaning defined above