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RSA is asymmetric key cryptography, which means it uses two keys.One key is used to encrypt the data and another is used to decrypt the data (one key, called the public key, is made available to any outside party; the other is kept by the user and is called the private key.) AES uses symmetric keys, which uses the same key to encrypt and decrypt information. The AES key for decryption is written in the files encrypted by the malware.However, this key is encrypted with an RSA public key embedded in the malware, which means that a private key is needed to decrypt it.

In this sense, it is similar to FAKEAV malware, but instead of capturing the infected system or encrypting files, FAKEAV shows fake antimalware scanning results to coax users into purchasing bogus antimalware software.

A case in 2012 involved a popular French confectionary shop’s website that was compromised to serve TROJ_RANSOM. This watering hole tactic resulted in widespread infections in France and Japan, where the shop also had a significant fan-base. BOV displayed a fake notice from the French police agency Reveton is a ransomware type that impersonates law enforcement agencies.

Known as Police Ransomware or Police Trojans, these malware are notable for showing a notification page purportedly from the victim’s local law enforcement agency, informing them that they were caught doing an illegal or malicious activity online.

It can also arrive as a payload either dropped or downloaded by other malware.

Some ransomware are known to be delivered as attachments from spammed email, downloaded from malicious pages through malvertisements, or dropped by exploit kits onto vulnerable systems.