Welcome to the Virus Encyclopedia of Panda Security.
It downloads and executes an adware type program in the affected computer.
Dropper.O is a Trojan that drops and executes the adware detected by Panda Software as Adware/Nsearch, in the affected computer.
Dropper.O is downloaded to the computer affected by MhtRedir.N from an specific website. MhtRedir.N exploits the vulnerability described by Microsoft in the security bulletin MS04-013, in order to download Dropper.O.
So it is highly recommendable to download the corresponding security patch available from Microsoft's website.
Dropper.O is difficult to recognize, as it does not display any messages or warnings that indicate it has reached the computer.
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