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SonicOS 5.8.1 Administrator Guide
Restricting File Transfers
For each protocol you can restrict the transfer of files with specific attributes by clicking on the
Settings button under the protocol in the Gateway Anti-Virus Global Settings section.
These restrict transfer settings include:
• Restrict Transfer of password-protected Zip files - Disables the transfer of password
protected ZIP files over any enabled protocol. This option only functions on protocols (e.g.
HTTP, FTP, SMTP) that are enabled for inspection.
• Restrict Transfer of MS-Office type files containing macros (VBA 5 and above) -
Disables the transfers of any MS Office 97 and above files that contain VBA macros.
• Restrict Transfer of packed executable files (UPX, FSG, etc.) - Disables the transfer of
packed executable files. Packers are utilities which compress and sometimes encrypt
executables. Although there are legitimate applications for these, they are also sometimes
used with the intent of obfuscation, so as to make the executables less detectable by anti-
virus applications. The packer adds a header that expands the file in memory, and then
executes that file. SonicWALL Gateway Anti-Virus currently recognizes the most common
packed formats: UPX, FSG, PKLite32, Petite, and ASPack. additional formats are
dynamically added along with SonicWALL GAV signature updates.