This is not a virus or a trojan. It is detected as a "potentially unwanted program" "PUP". It is an download program. It gets installed Browser Helper Object.
O2 - BHO: WebThunderBHO - {00000AAA-A363-466E-BEF5-9BB68697AA7F} - C:\Program Files\Thunder Network\WebThunder\WebThunderBHO_Now.dll
http://vil.nai.com/vil/content/v_142372.htm
Severity: High
This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.
Description
This signature detects an attempted attack against Internet Explorer caused by a maliciously crafted website using a vulnerable Xunlei Web Thunder ActiveX Control.
Additional Information
Xunlei Web ThunderThunderServer.WebThunder.1 ActiveX control is prone to an arbitary-file-download vulnerability.
http://www.symantec.com/business/security_response/attacksignatures/detail.jsp?asid=50050
C:\Program Files\Thunder Network\WebThunder\WebThunder.exe
Potentially unwanted tool:Application/WebThunder Not disinfected G:\Program Files\Thunder Network\WebThunder\historyinfo_manage.dll
Potentially unwanted tool:Application/WebThunder Not disinfected G:\Program Files\Thunder Network\WebThunder\setup.exe[historyinfo_manage.dll]
Potentially unwanted tool:Application/WebThunder Not disinfected G:\Program Files\Thunder Network\WebThunder\WebThunderBHO_016.dll