how Trojan.Zeroaccess comes in Endpoint??

Hi,

I want the information on following:

1) How exactly Trojan.Zeroaccess comes in Endpoint?

2) Possible Attack Vectors of Trojan.Zeroaccess

3) Does third party unwanted application plays a part in infection of  Trojan.Zeroaccess??

4) I have one endpoint with possible presence of Trojan.Zeroaccess, Is there any way to pull info about infection of Endpoint with Trojan.Zeroaccess from SEPM Console?

Prmopt reply will be appreciated.

Thanks & Regards,

Tejas Shardule