Understanding the mirai botnet

TLDR

The Mirai botnet, mainly composed of embedded and IoT devices, caused widespread DDoS attacks in late 2016, overwhelming high‑profile targets. The study analyzes Mirai’s seven‑month growth to 600 k infections and its DDoS victims, and proposes technical and non‑technical countermeasures and future research directions. The authors conduct a retrospective analysis using multiple measurement perspectives to trace Mirai’s emergence, affected device classes, and variant evolution and competition. The analysis reveals that Mirai’s simple infection mechanism and rapid growth expose the fragility of IoT devices, enabling even novice attackers to threaten well‑protected targets.

Abstract

The Mirai botnet, composed primarily of embedded and IoT devices, took the Internet by storm in late 2016 when it overwhelmed several high-profile targets with massive distributed denial-of-service (DDoS) attacks. In this paper, we provide a seven-month retrospective analysis of Mirai's growth to a peak of 600k infections and a history of its DDoS victims. By combining a variety of measurement perspectives, we analyze how the botnet emerged, what classes of devices were affected, and how Mirai variants evolved and competed for vulnerable hosts. Our measurements serve as a lens into the fragile ecosystem of IoT devices. We argue that Mirai may represent a sea change in the evolutionary development of botnets--the simplicity through which devices were infected and its precipitous growth, demonstrate that novice malicious techniques can compromise enough low-end devices to threaten even some of the best-defended targets. To address this risk, we recommend technical and nontechnical interventions, as well as propose future research directions.