: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Understand the ransomware risk Ransomware is malicious software that can lock or encrypt your files and then demand payment to restore access. Kurt Knutsson, FOXNews.com, 1 Sep. 2026 Because the package names are unregistered, an attacker could register one and use it to host ransomware or any other type of harmful package. Dan Goodin, ArsTechnica, 27 Aug. 2026 Between July 2023 and December 2024, 82% of schools experienced some type of cyber incident, such as a ransomware attack, a data breach or a phishing attempt, according to a report last year from the nonprofit Center for Internet Security. Linda Jacobson, Los Angeles Times, 26 Aug. 2026 In March, Foster City was hit by a ransomware attack that led to disruptions of all public services outside of emergency services. Tim Fang, CBS News, 6 Aug. 2026 See All Example Sentences for ransomware

Word History

First Known Use

2005, in the meaning defined above

Time Traveler
The first known use of ransomware was in 2005

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Cite this Entry

“Ransomware.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ransomware. Accessed 4 Sep. 2026.

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