Antivirus tasks
AntiVirus
FortiGate Version 4.0 Administration Guide
440
01-400-89802-20090424
Figure 276: Order of operation
Antivirus tasks
The antivirus tasks work in sequence to efficiently scan incoming files and offer your
network unparalleled antivirus protection. The first four tasks have specific functions, the
fifth, the heuristics, is to cover any new, previously unknown, virus threats. To ensure that
your system is providing the most protection available, all virus definitions and signatures
are updated regularly through the FortiGuard antivirus services. The tasks will be
discussed in the order that they are applied followed by FortiGuard antivirus.
File size
This task checks if files and email messages exceed configured thresholds. It is enabled
by setting the
Oversized File/Email
option under
Firewall > Protection Profile > Antivirus
to
Pass
.
For more information, see
“Anti-Virus options” on page 407
Start
FTP, NNTP, SMTP,
POP3, or IMAP traffic
after web filter spam
checking.
File or message
is buffered
Oversized
file/email
action
Pass
Block
File type
match?
File/email
exceeds
oversized
threshold
Yes
No
Block
file/email
File
Pattern
Match?
Matching
file pattern
action
Block
Allow
File/email
exceeds
oversized
threshold
Yes
No
Pass
file/email
No
Yes
AV scan
detects
infection?
Matching
file type
action
No
Yes
Allow
Block
Pass
file/email
Yes
No
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