Ro2cn is a typical adware designed to show undesirable commercial advertisements. It also can download suspicious files from predefined domain. Ro2cn can secretly get into the computer while visiting some unsafe web sites.
usign.dll
HKEY_CLASSES_ROOTIpripw.WbhoHKEY_CLASSES_ROOTIpripw.Wbho.140E3A34A-3282-41F8-AD2C-051BAB96AD4AHKEY_LOCAL_MACHINESOFTWAREClassesIpripw.Wbho.1HKEY_LOCAL_MACHINESOFTWAREClassesIpripw.WbhoCLSID