TY JOUR TI FORMAL MODEL OF COMPUTER ATTACKS, BASED ON SYSTEM EVENT RECORDS OF THE OPERATING SYSTEM KW formal model KW cyber attack detection KW machine learning KW classification KW system event analysis KW Event ID KW random forest KW cyber threats JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Pavlychev, A.V. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia