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Trojan:JS/Tracur.gen!C


First posted on 03 January 2012.
Source: Microsoft

Aliases :

There are no other names known for Trojan:JS/Tracur.gen!C.

Explanation :

Trojan:JS/Tracur.gen!C is trojan, a Java class file installed as part of a malicious Firefox extension used to redirect user search results from legitimate search sites to malicious websites.


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Trojan:JS/Tracur.gen!C is trojan, a Java class file installed as part of a malicious Firefox extension used to redirect user search results from legitimate search sites to malicious websites.



Installation

Trojan:JS/Tracur.gen!C is a Java class file component of a Firefox extension, installed on the computer by TrojanDownloader:Win32/Tracur.AI. The Java class file is contained in a JAR file found in the following file location:

%APPDATA%\Mozilla\Firefox\Profiles\.default\extensions\{CLSID}\chrome\xulcache.jar

The following files are also created and/or modified on the computer as part of the trojan's installation:

  • %APPDATA%\Mozilla\Firefox\Profiles\.default\extensions\{CLSID}\install.rdf
  • %APPDATA%\Mozilla\Firefox\Profiles\.default\extensions\{CLSID}\chrome.manifest
  • %APPDATA%\Mozilla\Firefox\Profiles\.default\extensions\{CLSID}\defaults\preferences\xulcache.js €“ detected as Trojan:JS/Tracur.B


Note: {CLSID} is a Class ID that differs for each computer on which it's generated.

If successfully installed, the Firefox extension appears in the Firefox Extensions menu with the name €œXUL Cache 1.0€





Payload

Redirects user searches

The malicious Firefox extension serves to redirect searches when the following search engines are used by the user in the Firefox browser:

  • Google
  • Yahoo
  • Aol
  • Bing
  • Ask.com


Search results are redirected to another website which may contain other malware or malicious scripts.



Analysis by Amir Fouda

Last update 03 January 2012

 

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