Worm:Win32/Conficker.B!inf is the detection used for the autorun.inf files created by Conficker.B when it attempts to spread through mapped and removable drives.
Worm:Win32/Conficker.B is a worm that infects other computers across a network by exploiting a vulnerability in the Windows Server service (SVCHOST.EXE).
If the vulnerability is successfully exploited, it could allow remote code execution when file sharing is enabled. It may also spread through removable drives and weak administrator passwords. It disables several important system services and security products.
Microsoft strongly recommends that users apply the update referred to in
Security Bulletin MS08-067
Microsoft also recommends that users ensure that their network passwords are strong to prevent this worm from spreading via weak administrator passwords. More information is available here.
Microsoft also recommends that users apply an update that changes the AutoPlay functionality in Windows to prevent this worm from spreading via USB drives. More information is available in the
Microsoft Knowledgebase Article KB971029