The warning came after the FBI successfully disrupted a major cybercriminal network in the US from using the viruses to infect computers and steal data.
GameOver Zeus, also known as P2PZeuS, was designed by Russia and Ukrainian gangs to find and harness computer files that give access to banking and financial information, while Cryptolocker encrypts all files on a target’s computer and demands the user pays around £300 to unlock the file.
Almost 250,000 computers worldwide have been infected with CryptoLocker since it emerged in April and it has so far been used to extort payments of more than $27m (£16m), according to the FBI.
Industry experts have been quick to back up the stern message from the National Crime Agency, whose advice to visit internet awareness group Get Safe Online's's website led to the site going down for 15 hours.
Below are some methods experts recommend to protect yourself from GameOver Zeus and CryptoLocker, and remove it if you suspect you computer is infected.
Protect your passwordsUnencrypted passwords should not be stored on your computer in case they are found by GameOver Zeus or another similarly aggressive malware programme, recommends Hugh Boyes, the head of the cyber security team at the Institution of Engineering and Technology's (IET).
“If there is a need to store passwords, then use a good password manager application, which backs up and shares with your smartphone or tablet computer.”
A woman uses her laptop in Istanbul.Set up an 'administrator account' Boyes also recommends that computer users have two separate accounts on their Mac or PC. One standard account should be for day-to-day use, while an ‘administrator’ account is used to make changes to the machine, like installing software or adding a printer.
By not using the administrator account for browsing the web or accessing emails, computer users can protect themselves from 90 per cent of malware attacks.
Update your computer programmes - especially anti-virus softwareThe NCA has advised that people ensure their security software is installed and updated, and that they run scans. Users should also check that their computer operating systems and applications in general are up to date.
Microsoft users can do this by using the ‘Check for Updates’ function on Windows Update, while Mac users can choose go to ‘Software Update’ on the System Preferences menu.
Beware of suspicious emailsDo not open email attachments unless you are certain they are authentic. Potentially harmful emails generally have some or all of the following characteristics according the Get Safe Online:
- You don’t know the sender.
- The message contains misspellings (for example using a zero instead of an ‘o’) designed to fool spam filters.
- It makes an offer that seems too good to be true.
- The subject line and contents do not match.
- Contains an urgent offer end date (for example “Buy now and get 50% off”).
- Contains a request to forward an email to multiple people, and may offer money for doing so.
- Contains a virus warning.
- Contains attachments, which could include .exe files.
Change your passwordsYour original passwords may have been compromised by GameOver Zeus and CryptoLocker, and could be used to harvest any important information you store or access on your computer.
Back up your files All of your files, including photos and documents, should be regularly saved to an external piece of hardware, such as a USB stick or an external hard drive. This means it will not be lost if your computer is attacked, or if it breaks.
Remove virusesThe US Government has recommended a number of remediation tools which can be used to remove GameOver Zues. These include: F-Secure (for Windows Vista, 7 and 8, or Windows XP), Heimdal (forMicrosoft Windows XP, Vista, 7, 8 and 8.1), and Kaspersky if you fear your computer is infected
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