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JS_FFSNIFF.A is non-destructive JavaScript malware embedded in a Java application. The Java application is used as a Firefox extension to monitor use of HTML forms in Web pages. Firefox is a browser that can be customized through themes and extensions.


This extension steals information entered in an HTML form that is loaded using Firefox. Information entered in an HTML form are stored in a variable in the Java code. The stored information is sent to an email address using a certain Simple Mail Transfer Protocol (SMTP) server.


This JavaScript malware is currently spreading in-the-wild and runs on Windows 98, ME, NT, 2000, XP, and Server 2003 with Firefox installed on the affected computer.

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