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A hacker called The Janitor has created multiple versions of a program called BrickerBot, a botnet that searches out and bricks insecure IoT devices. The devices all used a Linux package called BusyBox and had exposed telnet-based interfaces with default passwords. These devices were easily exploited by the Mirai botnet, which essentially turned them into denial-of-service weapons. BrickerBot finds these devices and renders them unusable. The first version attacked about a thousand devices and alternate versions attacked thousands more. It disabled the devices by formatting the internal memory.
To learn more about BrickerBot, read our ERT Threat Alert.