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I was shocked to find out an advertisement pop-up on a web-page I'd never expect to find an advertisement on; and I began wondering if there's anything wrong with my machine. Did any nasty virus break into my system? That was highly unlikely because I keep my machine inert to most attacks. I then discovered that it's nasty BSNL that's injecting advertisements directly into your browser at random. I inspected the code responsible for the advertisements: -The IP addresses resolve to BSNL owned servers and it's a clear indication that BSNL's just being nasty. The only solution to the problem, as it seems is that you need to block the IP locally using your router or hosts file. But that's a temporary solution because BSNL can quickly change their IP and the ads will start showing up again.I think it's highly unethical of BSNL to inject ads in the browsers of paying customers. Have you noticed unusual advertisements in the bottom-right corner of your browser?