Cryptolocker
A Cryptolocker is a type of ransomware that locks a users out of their machine unless they pay a ransom to the cyber criminal usually through bitcoin or one other payment that is normally an annonymous form as the cyber criminal doesnt want to be tracked through the payment. A cyptolocker is in short terms using the victims PC as a hostage and will not let it out of contact till the payment has been reached however some cyber criminals will make the cryptolocker pemenant so even if the victim pays they will not be sent the de-encryption key so even though they have paid the required sum of money their files renaub encrypted and they have no way of ever recieving them back. Cryptolockers are usually passed through emails with fake links that trick the user into thinking they will win a free Iphone etc and another way a user might recieve a cryptolocker on their PC will be through a botnet. Crytpolockers are rarely individually targeted at one particular person and they are usually mass targeted and the cyber criminals know that out of 100 people who recieve the fake email containing the cryptolocker they will get at least 5% who click the link and they only need 1 out of that 5% to pay up for the cyber criminals to have been successful.
https://en.wikipedia.org/wiki/CryptoLocker
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