A malicious plug-in for Google Chrome and Mozilla Firefox (with the names of Chrome Service Pack and Mozilla Service Pack) distributed as an installer of “browser update” that has a digital signature issued in the name of Updates LTD by Comodo. Once the browser with the incorporated malicious extension is launched, Trojan.Facebook.311 connects to a remote command and control server and receives a configuration file. The Trojan can automatically install updates after specified periods of time.

Once the webpage is filly loaded, the plug-in waits for the user to authorize on Facebook. After authorization, the Trojan can perform the following actions on user's behalf:

“Like” something
Post a specified status update
Create a specified post on a Timeline
Join a specified group
Comment on a post
Invite people from a contact list to a group
Send a specified message to people from a contact list

Curing recommendations

If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.

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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

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After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
- Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
- Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
- Switch off your device and turn it on as normal.

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