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Viruses propagating via Facebook Chat are recently increasing at a surprising rate. Exploiting online file sharing services to make the malicious links more trustworthy-like is hackers’ latest trick.  

Taking advantage of Facebook Chat to spread virus is not new. However, after a time of silence, these viruses suddenly continue spreading quickly.

Before, the links used were often strange, unfamiliar with users like http://5.k2[removed].su, http://1.8[removed]34.su. Lately, hackers begin to use user-friendly websites such as mediafire.com, 4shared.com, etc. These are all popular, trustworthy data storing sites. They are trusted on because files are checked by some antivirus softwares like BitDefender, etc. before being uploaded. Besides, users have long been familiar with sharing, downloading files from mediafire.com or 4shared.com. Therefore, they are much more likely to click on hackers’ links.

 

Picture 1: A malicious link spread via Facebook Chat

Normally, to download a file from sites like mediafire.com, users have to follow the link http://www.mediafire.com/?v8yvp0f9ix8572x, see the web interface and click on Download.

Understanding this, hackers have invested to purchase an account on mediafire.com to allow the direct downloading of virus file; then the web interface will no longer appear. This means the virus is quickly downloaded to users’ machine through just one click.

The downloaded virus is dubbed in the way a normal computer user names his files, and uses acquainted pictures (landscapes, models, folders, word file, excel files, and so on) as icons. In fact, it’s an executable file.

After being executed, the virus waits for users to login their Facebook and automatically chats with their friends, sends them messages containing malicious links. Users shouldn’t worry, because despite you have downloaded the virus, your machine still stays safe if you haven’t opened it.

It’s advisable that users make a habit of keeping vigilant when clicking on a link or executing a program. Verify the link’s origin or the downloaded file’s content first. With Facebook Chat, you just need to chat with your friends and ask them about the received content.

Pham Minh Dat

Malware Researcher

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