Beware of links from popular YouTube videos, as they may contain #malware. We found such a video (64K views, 180K subscribers) that has a link to a Tor Browser installer in the description. That installer comes with a previously unknown spyware that we dubbed #OnionPoison. [1/4] 
The malicious Tor installation has been configured to be less private (it stores browsing history, login data, etc.), and its freebl3.dll library is infected with malware. When the browser is launched, this library contacts the C2 server to receive a second stage implant. [2/4]
It's interesting that the server sends the second stage implant only if the victim's IP is from #China, so the campaign targets only Chinese-speaking users. Features of the spyware include collecting system information, stealing browser history and executing shell commands. [3/4]
For technical details and IoCs, please refer to our article @Securelist: securelist.com/onionpoison-in…
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