Antivirus protection Blocking files in firewall traffic
FortiGate-100 Installation and Configuration Guide 233
File blocking
Enable file blocking to remove all files that pose a potential threat and to provide the
best protection from active computer virus attacks. Blocking files is the only protection
available from a virus that is so new that antivirus scanning cannot detect it. You
would not normally run the FortiGate unit with blocking enabled. However, it is
available for extremely high-risk situations in which there is no other way to prevent
viruses from entering your network.
File blocking deletes all files that match a list of enabled file patterns. The FortiGate
unit replaces the file with an alert message that is forwarded to the user. The
FortiGate unit also writes a message to the virus log and sends an alert email if it is
configured to do so.
By default, when blocking is enabled, the FortiGate unit blocks the following file
patterns:
• executable files (*.bat, *.com, and *.exe)
• compressed or archive files (*.gz, *.rar, *.tar, *.tgz, and *.zip)
• dynamic link libraries (*.dll)
• HTML application (*.hta)
• Microsoft Office files (*.doc, *.ppt, *.xl?)
• Microsoft Works files (*.wps)
• Visual Basic files (*.vb?)
• screen saver files (*.scr)

Blocking files in firewall traffic

Use content profiles to apply file blocking to HTTP, FTP, POP3, IMAP, and SMTP
traffic controlled by firewall policies.
1Select file blocking in a content profile.
See “Adding a content profile” on page 170.
2Add this content profile to firewall policies to apply content blocking to the traffic
controlled by the firewall policy.
See “Adding a content profile to a policy” on page 171.

Adding file patterns to block

1Go to Anti-Virus > File Block.
2Select New.
3Type the new pattern in the File Pattern field.
You can use an asterisk (*) to represent any characters and a question mark (?) to
represent any single character. For example, *.dot blocks Microsoft Word template
files and *.do? blocks both Microsoft Word template files and document files.
4Select the check box beside the traffic protocols for which you want to enable blocking
of this file pattern.
5Select OK.
Note: If both blocking and scanning are enabled, the FortiGate unit blocks files that
match enabled file patterns and does not scan these files for viruses.