ĐĐinh Văn Mạnh·Sep 5MoiClient: Backdoor That Hides Inside SumatraPDFOverview On September 2, 2026, AhnLab ASEC (ATCP team) published an analysis of MoiClient — a newly identified Windows backdoor distributed via a fake invoice email, deploying a notable multi-layer de18 min read·blog.fiscybersec.com