Dnscat2 not getting blocked by Firewall (Detected as Proxy Application )

[Rajesh0032]

Device Version: FortiGate-1500D v5.2.0,

FortiAnalyzer v5.2.2

Application control : Default policy Block Proxy

 Our firewall is blocking all Proxy applications based on the policy but lately we are seeing application called Dnscat2 on FOrtianalyzer Proxy application report (SS attached)  . Unlike other proxy application's which are getting blocked by firewall , this particular application is not getting blocked even though its getting identified by firewall as Dnscat2:Proxy application (Tunnels data through port 53

http://fortiguard.com/appcontrol/app-41612

[jintrah_FTNT]

Hi Rajesh,

If required, the Dnscat2 signature can be set to "Block" to block this application using app control.

[Rajesh0032]

jintrah wrote:

Hi Rajesh,

If required, the Dnscat2 signature can be set to "Block" to block this application using app control.

thanks for reply but i alrdy checked that , Dnscat2 is coming under category Proxy and its blocked in my policies .still Dnscat2 is not getting blocked

[yamidt_FTNT]

Hi Rajesh, it is a good idea You attach the Fg config file. What is the src IP are you testing? What is the Policy Id that Gf is applying? Please capture on two CLI sessions: 1. Debug flow for that src. 2. Capture proxy detection at the same time: please use: dia ips share clear bt // to clear bt expect table dia ips de en proxy dia ips de en detect dia de en

Yamidt