$_SERVER["REMOTE_ADDR"] = preg_replace('/.*,\s*/','', $_SERVER["HTTP_X_FORWARDED_FOR"]);
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Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
Downloader.ab copies itself to %WINDIR%\System32 with a random name.
It then tries to download a file and execute it.