The American Federal Bureau of Investigation (FBI) said on Tuesday that it has taken down a network of hacked devices responsible for extorting tens of millions of dollars from victims around the world.

US officials described the network known as Qakbot as one of the most notorious “botnets” in the world, referring to computer networks that have been infected with malicious software so that they can be controlled remotely without the owner’s knowledge – often to send phishing emails.

These emails can in turn be used to hack into victims’ computer systems, which attackers will hold for ransom.

Qakbot was instrumental in enabling cyberattacks against businesses and critical services around the world, according to US officials, including hits on the San Bernardino County Sheriff’s Department and hospitals run by Prospect Medical Group. The latter resulted in the closure of emergency rooms and medical facilities across the US.


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