TY CONF TI HYBRID NEURAL NETWORK ARCHITECTURE WITH TWO-LEVEL ATTENTION SYSTEM FOR DIGITAL FOOTPRINT ANALYSIS IN UEBA-CLASS SYSTEMS KW hybrid neural networks KW LSTM KW Transformer KW Graph Attention Network KW two-level attention KW UEBA KW insider threats KW explainable AI JO MODELING INFORMATION SYSTEMS AND TECHNOLOGIES – 2026 AU Maltsev, V.V. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov