topic Re: ZeroAccess.Gen in General Topics

ZeroAccess.Gen

oshcomp — Thu, 28 Feb 2013 18:05:09 GMT

Our threat monitor shows a lot of ZeroAccess.Gen Command and Control traffic, type spyware. The default threat action is to alert. I want to either block or drop. What is the best way to block traffic for a specific threat signature but to use defaults on all others with the same severity?

The threat signature categorizes zeroaccess.gen, id 13235, as botnet. Are threat signatures used as part of the behavioral analysis in determining probable botnets? I don't see any correlation between destination IP addresses in the threat log and in the botnet report.

Thanks

Re: ZeroAccess.Gen

mbutt — Thu, 28 Feb 2013 21:50:53 GMT

Hi,

You can create an exception in you Anti Spyware profiles to block this threat instead of alerting it.

Let us know if this resolves your issue.

Thank you

Re: ZeroAccess.Gen

HITSSEC — Sun, 03 Mar 2013 19:17:59 GMT

Don't forget to check the enable box. The other approach is overriding the default actions globally in the policy for critical events.

Either approach will work but the prior approach (mbutt's) is a more cautious and controlled one. Just keep an eye on critical and high events and decide if you are happy with the default action being taken.

Re: ZeroAccess.Gen

oshcomp — Mon, 04 Mar 2013 15:59:43 GMT

Creating an exception for the specific threat seems to work. I am cautious about overriding the defaults for all critical threats.

I am considering a third option. I created a rule with a "Threat name" containing the string of the threat and an action of block. A second rule would use specify the default action for everything else. (My example says "alert" and not default. But that is just for testing.) My hope is that the rules will be processed in order. All ZeroAcess.Gen will be blocked. All other threats should use the default action.

Comments?

Re: ZeroAccess.Gen

HITSSEC — Mon, 04 Mar 2013 17:51:08 GMT

That would work also. I think either approach accomplishes the end result. My understanding is that it is processed in order top down like firewall rules. The exception in 4.1 is fileblocking profiles. https://live.paloaltonetworks.com/docs/DOC-2858 as a heads up if you go there.

Phil