With the help of a well-thought-out information security threat model, you can develop a protection plan that will be based on current threats. The task of creating the most effective system for assessing the state of asset protection of an enterprise is one of the main goals of modeling. They imply the universality of information security concepts. You should use various methodologies of this process with the necessary perspective and sufficient level of detail to describe the threat models. An approach using all possible threat implementations is constructed in the form of trees or attack graphs (GAT) with verification of their properties. The set of threats, connections and their parameters are determined by asset owners and information security specialists. The elimination of shortcomings in the security model with complete overlap became possible thanks to the use of such a data set and the described structure. In this article, we describe the creation of a software application for automating and formalizing the process of assessing the information security of information system assets and localization of information system security bottlenecks. A distinctive feature of the application is the use of the threat database of the FSTEC of Russia to simulate an attack tree. FSTEC of Russia is the state regulator in the field of information security. The developed software application saves time by simplifying the process of assessing the security of information systems, and also makes the process of threat modeling visual.