A threat level is evaluated for an ongoing attack detected for a set of resources based on received notifications having low weight in the evaluation of the threat level. If the threat level is smaller than an entrapment threshold, sensors associated with resources of an information system infrastructure that are potential subsequent targets of the ongoing attack are activated, the weight of the notifications sent from the activated sensors are set as average weight in the evaluation of the threat level, and the threat level is further evaluated for the ongoing attack. If the threat level is greater than the entrapment threshold, traps are deployed in the information system infrastructure, the weight of the notifications sent from the deployed traps are set as high weight in the evaluation of the threat level, and the threat level is further evaluated for the ongoing attack.