September 2017
Intermediate to advanced
314 pages
8h 5m
English
Ransomware uses common methods to encrypt files using keys that are known only to attackers. As a result, victims are unable to access the contents of the encrypted files. Most ransomware displays or drops a ransom note: an image or an HTML file that contains information about how to obtain the attacker supplied decryption tool for a fee. Unfortunately, paying the attacker does not guarantee the files will be decrypted, yet several companies have done this, only providing more funds for them to carry out further attacks against other companies. A better response is to ensure the files were backed up and carry out a restoration of the affected files, and then prevent this from occurring again.
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