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Inspection mode differences for antivirus

This section identifies the behavioral differences between Antivirus operating in flow and proxy inspection.

Feature comparison between antivirus inspection modes

The following table indicates which Antivirus features are supported by their designated scan modes.

Part1 Replacement Message Content Disarm Mobile Malware Virus Outbreak Sandbox Inspection NAC Quarantine
Proxy Yes Yes Yes Yes Yes Yes
Flow Full Mode Yes* No Yes Yes Yes Yes
Flow Quick Mode Yes* No No No Yes Yes

*IPS Engine caches the URL and a replacement message will be presented after the second attempt.

Part 2 Archive Blocking Emulator Client Comforting Infection Quarantine Heuristics Treat EXE as Virus
Proxy Yes Yes Yes Yes (1) Yes Yes (2)
Flow Full Mode Yes Yes No Yes (1) Yes Yes (2)
Flow Quick Mode No No No No No No
  1. Only available on FortiGate models with HDD or when FortiAnalyzer or FortiGate Cloud is connected and enabled.
  2. Only applies to inspection on IMAP, POP3, SMTP, and MAPI protocols.

Protocol comparison between antivirus inspection modes

The following table indicates which protocols can be inspected by the designated antivirus scan modes.

  HTTP FTP IMAP POP3 SMTP NNTP

MAPI

CIFS

Proxy Yes Yes Yes Yes Yes Yes

Yes

Yes*

Flow Full Mode Yes Yes Yes Yes Yes No

No

Yes

Flow Quick Mode Yes Yes Yes Yes Yes No

No

Yes

* Proxy mode antivirus inspection on CIFS protocol has the following limitations:

  • Cannot detect infections within archive files
  • Cannot detect oversized files
  • Will block special archive types by default
  • IPv6 is not supported

Other antivirus differences between inspection modes

Flow Quick mode uses a separate pre-filtering database for malware detection as opposed to the full AV signature database that Flow Full and Proxy mode inspection use.

Proxy mode uses pre-scanning and stream-based scanning for HTTP traffic. This allows archive files that exceed the oversize limit to be uncompressed and scanned for infections.

Inspection mode differences for antivirus

This section identifies the behavioral differences between Antivirus operating in flow and proxy inspection.

Feature comparison between antivirus inspection modes

The following table indicates which Antivirus features are supported by their designated scan modes.

Part1 Replacement Message Content Disarm Mobile Malware Virus Outbreak Sandbox Inspection NAC Quarantine
Proxy Yes Yes Yes Yes Yes Yes
Flow Full Mode Yes* No Yes Yes Yes Yes
Flow Quick Mode Yes* No No No Yes Yes

*IPS Engine caches the URL and a replacement message will be presented after the second attempt.

Part 2 Archive Blocking Emulator Client Comforting Infection Quarantine Heuristics Treat EXE as Virus
Proxy Yes Yes Yes Yes (1) Yes Yes (2)
Flow Full Mode Yes Yes No Yes (1) Yes Yes (2)
Flow Quick Mode No No No No No No
  1. Only available on FortiGate models with HDD or when FortiAnalyzer or FortiGate Cloud is connected and enabled.
  2. Only applies to inspection on IMAP, POP3, SMTP, and MAPI protocols.

Protocol comparison between antivirus inspection modes

The following table indicates which protocols can be inspected by the designated antivirus scan modes.

  HTTP FTP IMAP POP3 SMTP NNTP

MAPI

CIFS

Proxy Yes Yes Yes Yes Yes Yes

Yes

Yes*

Flow Full Mode Yes Yes Yes Yes Yes No

No

Yes

Flow Quick Mode Yes Yes Yes Yes Yes No

No

Yes

* Proxy mode antivirus inspection on CIFS protocol has the following limitations:

  • Cannot detect infections within archive files
  • Cannot detect oversized files
  • Will block special archive types by default
  • IPv6 is not supported

Other antivirus differences between inspection modes

Flow Quick mode uses a separate pre-filtering database for malware detection as opposed to the full AV signature database that Flow Full and Proxy mode inspection use.

Proxy mode uses pre-scanning and stream-based scanning for HTTP traffic. This allows archive files that exceed the oversize limit to be uncompressed and scanned for infections.