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I have reset both firefox and chrome but it did not help. I checked running processes and none seem suspicious to me. I purged both firefox and chrome but after re-install it has resurfaced again.
I'd looking for suggestions - where could such malwares be stored in the system? Or anyone has similar problem and have solved it, pls share your solution.
PS: I'm scanning with ClamAV anti-virus. Will update results if it's useful.
Problem comes for other user sessions as well. In fact, it shows up in windows partition as well.
I hard reset my router but still the problem persists!!
Problem shows up in macbook too.
Certainly the problem is not with Ubuntu or Chrome or Firefox. I'd keep this question alive so that others who face similar issues can pin-point their problem correctly, instead of ending up formatting their system unnecessarily.