1. Symantec/
  2. Security Response/
  3. Trojan.Fakeavlock


Risk Level 1: Very Low

June 21, 2012
December 3, 2012 2:47:13 PM
Infection Length:
450,560 Bytes
Systems Affected:
When the Trojan is executed, it creates the following file:
%UserProfile%\Local Settings\Application Data\[RANDOM CHARACTERS].exe

The Trojan appears as a security application with the title Security Shield and reports false or exaggerated system security threats on the computer.

It then displays frequent pop-up alerts about non-existent malware or security risks on the computer.

It then prompts purchase of software activation to remove non-existent malware or security risks from the computer.

It displays a pop-up message prompting the user to enter their credit card information to pay for the software.

It also blocks access to Web pages by displaying a warning message in the browser.

The Trojan may also block access to legitimate applications by preventing them from running (or stopping them if they are already running).

Some variants may have the title Live Security Platinum.

This variant will also display frequent warning messages about false or exaggerated system security threats on the computer.

This variant also prompts purchase of software activation to remove non-existent malware or security risks from the computer.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Andrea Lelli
Summary| Technical Details| Removal

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