In one aspect, the present invention is directed to a method for detecting spyware activity, the method comprises the steps of: monitoring outgoing communication data sent from a user's computer; searching for predefined keywords within the communication data; indicating spyware activity in the user's computer by presence of at least one of the predefined keywords within the communication data, the keywords are selected from a group comprising: a signature of the spyware, personal information of the user, an addressee to where the communication data is sent. The method may further comprise: upon detecting a spyware activity in the user's computer, blocking communication from the computer. The method may further comprise removing the spyware. The blocking can be carried out at the user's computer, at the gateway to which the user's computer is connected, etc.