Block Certain E-Mail Attachment Types There are numerous kinds of executable file attachments that many organizations do not need to routinely distribute via e-mail. If possible, block these at the perimeter as a countermeasure against the malicious code threat. Organizations using Outlook can also block them using Outlook 2002 or, for earlier versions of Outlook, using the appropriate security patches. The specific file types that can be blocked are: .bas .hta .msp .url .bat .inf .mst .vb .chm .ins .pif .vbe .cmd .isp .pl .vbs .com .js .reg .ws .cpl .jse .scr .wsc .crt .lnk .sct .wsf .exe .msi .shs .wsh It may be prudent to add, or delete files from this list depending upon operational realities. For example, it may be practical to block applications within the Microsoft Office family, all of which can contain an executable component. Most notable are Microsoft Access files, which unlike other members of the Office family have no intrinsic protection against malicious macros.
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