Since at least early December 2019, a mysterious hacker group has been taking over DrayTek enterprise routers to eavesdrop on FTP and email traffic inside corporate networks, Chinese security firm Qihoo 360 said today. In a report published on the blog of its network security division Netlab, Qihoo said its researchers detected two different threat actors, each exploiting a different zero-day vulnerability in DrayTek Vigor — load-balancing routers and VPN gateways typically deployed on enterprise networks.

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