A Google study has found several sneaky and deceptive ad injectors forcing their way through browsers. Google acknowledged that such behavior is definitely unwanted and took firm steps by disabling a multitude of such Chrome extensions.
Because there are multiple players involved in the distribution of potentially unwanted programs (PUPs), you can end up with a sequence of PUPs coming from multiple different sources.
According to recent reports, uTorrent, one of the world’s most popular torrent clients, is bundling bitcoin mining software called “EpicScale” with its latest version. Some even suggest that this is done without the user’s consent.