Browsers opens only https sites
188.43.69.98 is a Russian IP and announced as owned by 'Closed Joint Stock Company TransTeleCom' and not is not an official Google IP.  It tries to disguise itself by falsifying its reverse dns pointer pretending to be 'cache.google.com' but this is a lie.

Chances are very high your system has been hijacked somehow.  Perhaps not your Mac but your internet router could be compromised.  My guess you have an ADSL connection on a TP-Link or D-Link ADSL router which are easy targets.

Log in into your router and check what the DNS servers are set to.