Techbook

ImageSource TorrentLocker is a ‘Trojanhorse’ that encrypts files on the compromised computer using a symmetric block cipher AES to encrypt files and an asymmetric cipher RSA to encrypt the key. Monetary ransom is demanded by the criminals to unlock the infected computer. TorrentLocker was first observed in February 2014 and by the year end 5 major releases of this malware were discovered. TorrentLocker infections are initiated with a spam email. The victim is told to pay the amount in BitCoins that usually starts around $550 within 3 days.

LOCKY quite a derogatory name ! ImageSource LOCKY is a ransomware that scrambles and renames all your files with .locky extension, released in 2016 LOCKY is an email-worm and macro virus Trojan program similar to Cryptolocker. This ransomware is spread through email with an attached MS-Word document containing the malicious macros to thousands of computers. When the victim enables the macros setting in the word, the macros then save and run a binary file that downloads the actual encryption Trojan, which will encrypt all files to a unique 16-digit combination using the RSA-2048 and AES-1024 algorithms. **The files could be decrypted using a decrypter given by criminals costing 0.5 BitCoins.

KERANGER the first wild  MacOS Ransomware ! KeRanger also known by OSX.KeRanger.A is known as the first CryptoRansomware Trojan effectively targeting Apple computers. Discovered on March 4, 2016, has affected more than 7,000 Mac users. KeRanger is remotely executed on the victim's computer from a flaw in transmission of Bit Torrent client. The only way this malware could invade the victim's computer was by using a valid developer signature issued by Apple, that allowed it to bypass Apple's built-in OS X’s security feature designed to block software’s from untrusted sources. **The malware display’s a ransom message, demanding the victim to pay 1 BitCoin (~ $408)