What would you do if your company’s IT devices were discovered to be part of a botnet? In October 2018, dozens of companies’ Hadoop servers were found to be compromised and participating in a self-replicating botnet. The botnet’s malware was able to install itself via a vulnerability in Hadoop that had been publicly known for over two years . Botnets are a significant threat to U.S. online infrastructure. According to Kaspersky Labs, the majority of cyber attacks originating from botnets in 2018 targeted financial services and online stores .