Abstract: The present invention relates to a method and system for monitoring webpages for detecting malicious contents. According to a preferred embodiment the method comprises A) providing a plurality of URLs provided by a subscriber, employing a crawler to visit a URL webpage of said plurality of URLs; B) retrieving an object from said URL webpage by said crawler; C) analyzing said object retrieved by said crawler from said URL webpage, and determining whether said object retrieved is malicious or not; and D) alerting the subscriber, when said retrieved object is deemed malicious. According to one embodiment, the method further comprises E) employing a crawler to visit a URL webpage of a following URL of the plurality of URLs, when the determination of step C) is deemed not malicious; and F) returning to step B).