This post from Malwarebytes has all the details: http://blog.malwarebytes.org/intelligence/2013/10/cryptolocker-ransomware-what-you-need-to-know/
How does Cryptolocker get on my computer?
This ransomware is spread through email attachments. Read our previous post on malware for tips on avoiding harmful email attachments.
Is there anything that can protect my computer from Cryptolocker?
The only proven preventative tool is Malwarebytes Anti-Malware Pro. If you have this running and Cryptolocker tries to attack your computer, it will be blocked. However, if you do not have Malwarebytes running and Cryptolocker gets on your computer, there is nothing that the software can retroactively do to remove it.
Baroan Technologies offers Malwarebytes Anti-Malware Pro and Kaspersky Antivirus as options you can include in your maintenance plan. Contact us for further information.
What happens if Cryptolocker succeeds in holding my computer ransom?
You are at risk of losing your computer’s files beyond recovery. If you have a backup that is NOT stored on your computer, then your files can be restored from that. Backups stored locally are at risk of infection.