'Folklorica' is an advaced backdoor that uses Internet Explorer's OLE objects for communicate to outside.
Folklorica can:
-Bypass proxys (even with authentication)
-Bypass personal firewalls (because it uses a trusted program, Internet Explorer)
Backdoor features:
Communication between client <--> server is encrypted
Take screenshots
Download remote files
Execute remote commands
You can download Folklorica 2.0 here