A malicious malware called CryptoLocker has become the scariest threat to PC's around the world. A ransomware by its application and use, CryptoLocker raked in around 5 million dollars in the last 4 months of 2013, that earlier took nearly a year for cyber attackers to acquire. Johannes B. Ullrich, chief research officer at the SANS Institute stated that "A compromised personal computer for a botnet or Distributed Denial of Service attack is worth about a buck to a byte bandit." He added that cyber-criminals can easily make 100 dollars and more with the ransomware.

Jarvis, of SecureWorks states that the CryptoLocker crew is known for maintaining good customer relations. “They’re honoring people who do pay the ransom. In most cases they’re sending the decryption keys back to the computer once they receive payment successfully,” he explained. “We don’t know what the percentage of people who successfully do that is, but we know it’s part of their business model not to lie to people and not do it."

What makes the malware different from other malicious software is that it uses strong encryption. Files and documents on machines infected with the Trojan are scrambled using AES 256-bit encryption. CryptoLocker holds the victim's PC hostage till they pay a ransom amount.