Leonid Bezvershenko
Security Researcher, GReAT
Leonid joined Kaspersky in 2020 as an intern in the Global Research and Analysis Team (GReAT). In 2021, he was invited to the GReAT as a Junior Security Researcher. In 2023, he was promoted to Security Researcher. In this role, Leonid focuses on open‑source security, reverse engineering and malware analysis. His research includes the analysis of APT campaigns, such as Operation Triangulation and CloudWizard. Additionally, he is actively involved in the development of internal tools and infrastructure. Leonid is currently enrolled in Lomonosov Moscow State University and studies Fundamental Informatics and Information Technology.Publications
Reports
Cloud Atlas activity in the first half of 2025: what changed
Kaspersky expert describes new malicious tools employed by the Cloud Atlas APT, including implants of their signature backdoors VBShower, VBCloud, PowerShower, and CloudAtlas.
Operation ForumTroll continues: Russian political scientists targeted using plagiarism reports
Kaspersky’s GReAT experts have uncovered a new wave of cyberattacks by the ForumTroll APT group, targeting Russian political scientists and delivering the Tuoni framework to their devices.
Tomiris wreaks Havoc: New tools and techniques of the APT group
Kaspersky discloses new tools and techniques discovered in 2025 Tomiris activities: multi-language reverse shells, Havoc and AdaptixC2 open-source frameworks, communications via Discord and Telegram.
ToddyCat: your hidden email assistant. Part 1
Kaspersky experts analyze the ToddyCat APT attacks targeting corporate email. We examine the new version of TomBerBil, the TCSectorCopy and XstReader tools, and methods for stealing access tokens from Outlook.
