The payment processing service is built into the program’s pane, so the person can navigate back and forth using the toggles provided. According to the notifications, the victim has to pay 0.5-1 Bitcoin during 72 hours. It displays a UI with a warning message and configures an image with ransom instructions to replace the original desktop wallpaper. It’s only at this point that the Trojan notifies the user of the attack. Some versions of the malware contort the appearance of files by modifying the filenames and adding bizarre extensions. Once the list of the victim’s personal files has been compiled, Cryptolocker triggers the encryption routine and makes them inaccessible. The next stage is a scan of all letter volumes both on the hard drive and the adjacent network if any. The first thing it does on a contaminated Windows computer is it adjusts the work of the host system in its own way by adding autostart values and disabling VSS (Volume Shadow Copy Service) to prevent easy file restoration. Anyway, it takes this ransomware some time before it gets down to the crypto job proper. The entropy is in fact smaller as the keys are 2048 bits long, but it’s still enough to make the decryption vector of file recovery efforts null and void. Incidentally, the recent edition of Cryptolocker mentions RSA-4096 asymmetric cipher on its warning screen, but this isn’t quite true. Cryptolocker user interface with ransom demands The way this crimeware deploys encryption is tricky as it actually leverages an amalgam of RSA and AES, thus leaving hardly any data recovery options for the assaulted person other than paying the ransom. Although it has gone through several critical ups and downs, its recurrent iterations never failed to hit the headlines due to the invariably large attack surface, unbeatable cryptographic grip on infected users’ personal files, and high success rate of payload serving. The malicious program known as Cryptolocker typifies such an inviolability. The threat landscape has changed considerably over this period, but some infections from this cluster stay and still thrive. It has been around three years since the first fully functional instances of encryption-based ransomware emerged. The article covers must-know facts about Cryptolocker, an advanced persistent Trojan that applies uncrackable RSA cipher to encode victims’ data.
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