According to Symantec AntiVirus Research Center, "PHP.Pirus is the first virus written in PHP, a server-side scripting language used for dynamic Web page generation. The virus searches for .php and .htm files and inserts code to call itself. The virus executes only on servers with PHP interpreters. This virus cannot be contracted by simply visiting an infected Web page." The Web page offers technical description and how to remove the virus.
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