IE11 Injecting Favicon.ico into the end of the url

Since a few days we are seeing "favicon.ico" and "|//browserguard1" has been frequently added to the end of the url causing errors. The requests share this attributes in common:

1.- browser client --> IE11  (Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko)

2.- referer --> "http://127.0.0.1/ie-tab-l/indexIE.html"

3.- example request: 

optionName=Searchingfavicon.ico HTTP/1.1″ 200 3618 “http://127.0.0.1/ie-tab-l/indexIE.html” “Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko”

Started early Feb 2014.

anyone could help us?

Best regards!!