Ransomware is the type of virus is used to lock a user's system, or cloud accounts until the system's owner complies by paying the attacker a monetary fee.
Ransomware is a subset of malware in which the data on a victim's computer is locked typically by encryption and payment is demanded before the ransomed data is decrypted and access is returned to the victim after the payment is made.
The motive for ransomware attacks is usually monetary, and unlike other types of attacks, the victim is usually notified that an exploit has occurred and is given instructions for how to recover from the attack.
Payment is often demanded in a virtual currency, such as bitcoin, so that the cybercriminal's identity is not known.
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