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Sangeeth_N
Nickel

Anti-Virus not blocking malicious .zip, .doc files.

Observed in SmartEvent that the Anti-virus is not preventing the malicious files with extension .doc, .zip etc [with severity : critical and confidence : High ], instead it is just getting detected.

I would like to know whether this is a normal behavior in hashtag#checkpoint or did i have to make any changes in my anti-virus profile configured in threat prevention blade?

Note : Threat Emulation is not enabled in this environment.

6 Replies
Admin
Admin

Re: Anti-Virus not blocking malicious .zip, .doc files.

A screenshot of the log (with sensitive data masked) might be helpful.

Also curious what setting you're using for Resource Classification as shown here:

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Sangeeth_N
Nickel

Re: Anti-Virus not blocking malicious .zip, .doc files.

Hi Dameon

 

Kindly find the relevant logs regarding the issue.

 

Log from SmartEvent :

 

Engine settings :

 

 

 

Anti-virus Profile :

 

 

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Admin
Admin

Re: Anti-Virus not blocking malicious .zip, .doc files.

The first thing I would do is try setting the Resource Classification Mode to Hold instead of Background.

This will not allow the entire file to be sent to the endpoint until it is scanned.

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Sangeeth_N
Nickel

Re: Anti-Virus not blocking malicious .zip, .doc files.

Hi Dameon

I got your point. At this point we cannot set the Resource classification to Hold, as there will be an impact on traffic as it holds the files till the scanning is completed .

But the thing is, i am I able to observe some of the events with Severity High and confidence level High is getting prevented by Antivirus inspection. but the same is not happening for Critical events. Any idea on this?

And it will be really helpful if you let me know what the "inspect" option under [Threat Prevention->Profile->(Profile name)->Anti-Virus settings->Process specific file types families ] do and what will be the outcome of it?

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Admin
Admin

Re: Anti-Virus not blocking malicious .zip, .doc files.

In some cases, the file can be blocked by URL or other characteristics without transferring the entire file.

This may be why you are seeing "prevent" in some cases and "inspect" in others.

It's likely a side effect of leaving Resource Classification in Background.

If you're concerned about end users being impacted by putting Resource Classification in Hold, create a separate Threat Prevention profile just for your mail server where it set to Hold.

Create a Threat Prevention rule that refers to your email server in the Protected Scope and apply your new profile.

Mail is pretty fault-tolerant and should not be negatively impacted by this.

In the Threat Prevention profile with regard to extensions

  • Inspect means submit to ThreatCloud for analysis and allow only if deemed safe.
  • Block means don't allow the attachment at all (irrespective of the file 

Re: Anti-Virus not blocking malicious .zip, .doc files.

Background classification means the file passes and classification is done afterwards.

With hold it would wait for classification and the allow/block it based on verdict.

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