Cloudflare's 2025 Q3 DDoS threat report -- including Aisuru, the apex of botnets
Dec 3, 2025Omer Yoachimik, Jorge Pacheco
Summary
This post details the Q3 2025 DDoS threat landscape, highlighting the unprecedented scale of attacks from the Aisuru botnet (exceeding 29.7 Tbps and 14.1 Bpps). It quantifies the surge in DDoS attacks against AI companies (347% MoM), the impact of geopolitical tensions on attacks against the Mining, Minerals & Metals and Automotive industries, and the overall increase in DDoS attacks mitigated by Cloudflare (15% QoQ, 40% YoY). It also analyzes attack characteristics, top attack sources (Indonesia leading), and top attacked industries and locations, correlating them with geopolitical events.
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