Microsoft is warning of an attack that could be used to divert someone's web traffic through a malicious proxy server. A malicious WPAD.dat file could be placed in the Domain Name System (DNS) or the Windows Internet Naming Service (WINS), Microsoft said. The client application, looks in DNS or WINS to resolve the name of the hosting that has the proxy configuration file. Microsoft has posted information on its support site regarding this issue along with details for administrators on how to configure DNS and WINS on their servers to help prevent this type of attack.