Snort mailing list archives
Re: Fwd: Snort catching backup as alert?
From: William Rehnquyst <rehnquyst () gmail com>
Date: Thu, 22 Aug 2013 13:01:20 -0400
Thank you all for the replies, Alex, Jefferson and waldo kitty. I am currently using threshold to quiet it down, but not suppressing it. My replies to waldo kitty's finer points below: On Mon, Aug 19, 2013 at 1:51 PM, waldo kitty <wkitty42 () windstream net>wrote:
Below is the payload it captured, which triggered the alert:1.sid:17340; rev:3;)is looking on any port for a simple content only match... yes, this one is likely firing because of seeing that exact string... i note also that the rule is looking for traffic from $EXTERNAL_NET to $HOME_NET and that brings up a few questions: 1. is your backup server external to your network? 2. is this detection happening when your backup server is sending the traffic to a machine in your home net during a restore?
1. No, our backup is internal, and our current Snort configuration detects both ext and int traffic (I am aware of recommendations that ext and int sniffers be separated). 2. Most likely not during a restore, but during backup. I don't have an exact time for when I know backup is happening, but I know it's happening during the backup window. And it triggers within the same hour every night.
sid:17341; rev:2;)this rule has three content matches but they are hex coded so not straight strings in the content matches... no idea if this rule is triggering on seeing itself...
Just want to reiterate that those rules I posted are payloads that Snort captured, not copy-pasted from the rule file myself.
alert ip $EXTERNAL_NET any -> $HOME_NET any (msg:"INDICATOR-SHELLCODEx86 OS agnostic xor the SID was left out on this one so i don't know what rule it is...
Sorry, I should mention that the payload cuts off here.
ps. On a side note, pardon my newbie-ness, how does screenshots and attachment work on a mailing list like this? I'm not sure whether they work or not because I never see them in the archive onseclists.org?it is best to just copy'n'paste the information into a post rather than trying to do screenshots... mainly because graphics are larger than the data you are trying to show... as for them not appearing on seclists, that may be because seclists doesn't allow them and so strips them out... as a general rules, each mailing list is different... some do not allow attachments at all... others allow any attachments up to a certain size... then some restrict the type of attachments and may also apply size restrictions to them... these details should be available in the rules for the list which everyone should read before joining the list... as for other systems that import the list and make it available in another format, they have their own rules... as long as posts made on them that get transferred back to the list conform with the list's rules, there are no problems...
I generally read/check the rules when I join a forum/mailing list like this, being a former moderator somewhere else; but I did not see a rule page on the sign up page (and it's not like it's a forum that you can go in and search for it): https://lists.sourceforge.net/lists/listinfo/snort-users Thanks for answering my questions in such detail waldo kitty. Much appreciated.
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Current thread:
- Fwd: Snort catching backup as alert? William Rehnquyst (Aug 19)
- Re: Fwd: Snort catching backup as alert? Jefferson, Shawn (Aug 19)
- Re: Fwd: Snort catching backup as alert? waldo kitty (Aug 19)
- Re: Fwd: Snort catching backup as alert? William Rehnquyst (Aug 22)
- Re: Fwd: Snort catching backup as alert? waldo kitty (Aug 22)
- Re: Fwd: Snort catching backup as alert? William Rehnquyst (Aug 22)
- Re: Fwd: Snort catching backup as alert? Alexandre Carmel-Veilleux (Aug 24)
- Re: Fwd: Snort catching backup as alert? waldo kitty (Aug 24)
- Re: Fwd: Snort catching backup as alert? Joel Esler (Aug 25)
- Re: Fwd: Snort catching backup as alert? waldo kitty (Aug 24)