The article proposes a model that describes the effects of cyber attacks on virtual cloud resources (VCR) of various informatization objects (IO). The developed model served as the basis for an algorithm that allows to analyze threats in the IO cloud environment. The proposed algorithm in this work allows to obtain attack routes, that is achieved by synthesizing the attack graph and the graph of the correlative alert about the state of the IO virtual cloud environment (VCE). There is proposed a model for assessing the state of VCR. This model has become the basis for the algorithm for choosing countermeasures to protect the IO VCE. Ultimately, the proposed solutions allow to obtain a calculated indicator of functional stability (FS) and cybersecurity (CS) of IO virtual resources. And then to form countermeasures for increasing the FS and CS index of IO virtual cloud resources. During the research, there was developed a technique for providing FS and VCE CS based on software-configured networks. The developed technique allows to focus the attention of the protection side on increasing the FS and CS of virtual machines on the basis of the attacks detection and subsequent reconfiguration of virtual networks in VCE.
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