Facebook disclosed that it carried out its first botnet takedown of a Greek operation called Lecpetex. The botnet victimized 250,000 computers, stole Facebook and other credentials, and dropped Litecoin mining software. Facebook said it detected spikes in spam moving on its platform starting in December. Most of the victims were in Greece, with pockets of others in Poland, Portugal, Norway, India and the United States. The attackers used social engineering to trick users into opening an infected.zip attachment in a spam message.
Source: https://threatpost.com/facebook-carries-out-lecpetex-botnet-takedown/107096/