User-agent: Yandex
Disallow: /*_openstat
Disallow: /*from=adwords
Disallow: /*utm_

User-agent: Googlebot
Disallow: /*_openstat
Disallow: /*from=adwords
Disallow: /*utm_

User-agent: *
Disallow: /*_openstat
Disallow: /*from=adwords
Disallow: /*utm_