A 29-year-old British man has been arrested on suspicion of launching a Mirai-based attack last year on Deutsche Telekom. That had been followed by a similar attack targeting users' routers distributed by TalkTalk, among others.
The Deutsche Telekom attack had brought internet access grinding to a halt for almost one million German internet users at the end of November last year, as the firm explained last year.
"The attack attempted to infect routers with a malware but failed which caused crashes or restrictions for four to five percent of all routers. This led to a restricted use of Deutsche Telekom services for affected customers. We implemented a series of filter measures to our network."
It was the British Police that picked up the British subject on behalf of police in Germany. Reuters says that the National Crime Agency (NCA) picked him up at a London airport, although did not specify which one.
In a statement, German police said: "The Briton is accused of attempted computer abuse in a particularly serious case. He is suspected of having carried out an attacking campaign against the Internet, at the end of November 2016, whereby more than 1,000,000 Deutsche Telekom customers could no longer use their Internet connection.
"The consequences were, among other things, breakdowns of Internet and telephone services of the affected connections. The aim of the attack would have been to take over the routers and integrate into a bot network operated by the accused. The bot network is supposed to have offered the accused in the Darknet for consideration for arbitrary attack scenarios, such as so-called DDoS attacks."
The man will no doubt face extradition to Germany to stand trial.
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