Snort mailing list archives
Re: unified2 - multiple events and single packet question
From: Jeff Sundquist <jeffsundquist () gmail com>
Date: Wed, 26 Mar 2014 19:52:51 -0400
Answering own question ( got private email from others ): Yes, there should be a packet after each event. I was using 2.9.2.3 for my test. I updated to 2.9.6.0 and now see the packets after each event. I broke rule #1 : always update to latest before posting.... Found the following in the changelog for 2.9.3 which probably fixed it: - Correctly log TCP segments to unified2 when there are multiple alerts on the same reassembled packet. Thanks, Jeff On Wed, Mar 26, 2014 at 4:36 PM, Jeff Sundquist <jeffsundquist () gmail com>wrote:
I have a single packet that triggers multiple rules and I end up with the following unified2 from it: (Event) sensor id: 0 event id: 1 event second: 1395855838 event microsecond: 898374 sig id: 2011967 gen id: 1 revision: 3 classification: 29 priority: 1 ip source: 192.168.34.253 ip destination: 192.168.234.100 src port: 60968 dest port: 80 protocol: 6 impact_flag: 0 blocked: 0 Packet sensor id: 0 event id: 1 event second: 1395855838 packet second: 1395855838 packet microsecond: 898374 linktype: 1 packet_length: 207 [ 0] 00 0C 29 88 8C 67 00 22 19 D4 DC 85 08 00 45 00 ..)..g."......E. [ 16] 00 C1 1E 70 40 00 40 06 8D 14 C0 A8 22 FD C0 A8 ...p@.@....."... [ 32] EA 64 EE 28 00 50 29 B8 0F 2E 7E 4D 21 1E 50 18 .d.(.P)...~M!.P. [ 48] 00 5C 74 F9 00 00 47 45 54 20 2F 63 6D 64 2E 65 .\t...GET /cmd.e [ 64] 78 65 3F 31 32 26 66 6F 6F 3D 2F 62 6F 74 2E 65 xe?12&foo=/bot.e [ 80] 78 65 26 62 61 72 3D 31 31 32 20 48 54 54 50 2F xe&bar=112 HTTP/ [ 96] 31 2E 30 0D 0A 55 73 65 72 2D 41 67 65 6E 74 3A 1.0..User-Agent: [ 112] 20 57 67 65 74 2F 31 2E 31 30 2E 32 20 28 52 65 Wget/1.10.2 (Re [ 128] 64 20 48 61 74 20 6D 6F 64 69 66 69 65 64 29 0D d Hat modified). [ 144] 0A 41 63 63 65 70 74 3A 20 2A 2F 2A 0D 0A 48 6F .Accept: */*..Ho [ 160] 73 74 3A 20 31 39 32 2E 31 36 38 2E 32 33 34 2E st: 192.168.234. [ 176] 31 30 30 0D 0A 43 6F 6E 6E 65 63 74 69 6F 6E 3A 100..Connection: [ 192] 20 4B 65 65 70 2D 41 6C 69 76 65 0D 0A 0D 0A Keep-Alive.... (Event) sensor id: 0 event id: 2 event second: 1395855838 event microsecond: 898374 sig id: 2009361 gen id: 1 revision: 4 classification: 21 priority: 2 ip source: 192.168.34.253 ip destination: 192.168.234.100 src port: 60968 dest port: 80 protocol: 6 impact_flag: 0 blocked: 0 (Event) sensor id: 0 event id: 3 event second: 1395855838 event microsecond: 898374 sig id: 1002 gen id: 1 revision: 10 classification: 30 priority: 1 ip source: 192.168.34.253 ip destination: 192.168.234.100 src port: 60968 dest port: 80 protocol: 6 impact_flag: 0 blocked: 0 Question : Is this the correct behavior? The unified2 doc states the following "A Unified2 Packet is provided with each Unified2 Event record". I ask because barnyard2 isn't recording all three signatures since there is no packet included. I want to know whether I need to update barnyard2 or if there is an issue with snort or if I'm missing something. One more... If a single packet for 3 rules is correct, is there a way to associate event 2 and 3 with the packet? Thanks, Jeff
------------------------------------------------------------------------------
_______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
Current thread:
- unified2 - multiple events and single packet question Jeff Sundquist (Mar 26)
- Re: unified2 - multiple events and single packet question Jeff Sundquist (Mar 26)
- Re: unified2 - multiple events and single packet question Joel Esler (jesler) (Mar 26)
- Re: unified2 - multiple events and single packet question Jeff Sundquist (Mar 26)