CryptoLocker is most often spread through booby-trapped email attachments and uses military grade encryption. The malware can also be deployed by hacked and malicious web sites by exploiting outdated browser plugins.
Encrypting ransomware (Cryptolocker, CTB Locker, Crtroni, Cryptowall, ect.) is a very difficult infection to remediate because it uses the RSA public-key encryption algorithm to encrypt user files using unique encryption keys for each computer. Once a user’s files are encrypted this way, it is next to impossible to decrypt them without access to the private key that is stored on the remote servers in use by the malware author(s). There are no tools currently that are capable of decrypting these files without the private key.
As long as SecureAnywhere is installed prior to infection, All encrypting ransomware should be detected and removed before it is allowed to make any changes on the computer. Threat Research has many rules in place already to detect the known variants of Cryptolocker at or before execution, but it is important to remember that malware is constantly changing and we cannot guarantee that we will initially detect all new variants.
For best practices on securing your environment from encrypting ransomware please see our community post: