1. A method for detecting targeted attacks from a network resource, comprising: obtaining, by a processor of a computing device, data from multiple computer systems and devices connected with one another in a communications network to determine a possibility of a targeted attack from the network resource, the data comprising information relating to the network resource and a set of parameters of each computer system or device in accessing the network resource; detecting discrepancies in the obtained data relating to the possibility of the targeted attack from the network resource from the multiple computer systems and devices; forming and sending queries, by the processor, to a group of computer systems and devices detecting the possibility of the targeted attack with the set of parameters of the group of computer systems and devices in accessing the network resource, wherein the parameters are varied at least until one parameter or set of parameters is identified that is common to the computer systems in the group for which presence of the discrepancy is confirmed; and calculating a probability of the targeted attack from the network resource based at least upon information received from the group of computer systems and devices in response to the queries.