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Old 01-15-2015, 07:08 PM   #1
sniper8752
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snort rule


I am trying to setup a Snort rule. Here is my rule:
Code:
alert tcp any any -> any any (msg:"WARNING bad content here"; content:"bad stuff"; nocase; flow:to_client,established; classtype:nonsense; sid:1000001; rev:1;)
I go to somewhere that has "bad stuff". But when I go there, I do not get any alerts in the log file. Why does this not work?
 
Old 01-17-2015, 06:15 AM   #2
unSpawn
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Quote:
Originally Posted by sniper8752 View Post
I go to somewhere that has "bad stuff".
Be specific and complete providing nfo. How do you "go there"? Browser? FTP client Other?


Quote:
Originally Posted by sniper8752 View Post
Why does this not work?
Yes, that's the question. Now take it one step further and start diagnosing things from the ground up:
- Is this the only rule loaded?
- Does restarting Snort show any anomalies on stdout, stderr, syslog or its own log file?
- Do you use any BPF, alert or other suppression rules?


Quote:
Originally Posted by sniper8752 View Post
Code:
alert tcp any any -> any any
Shouldn't you be using the EXTERNAL_NET and HOME_NET variables and a remote port number to narrow down things?


Quote:
Originally Posted by sniper8752 View Post
Code:
content:"bad stuff";
How did you determine this is the correct string to use?


Quote:
Originally Posted by sniper8752 View Post
Code:
classtype:nonsense;
Should you jeopardize the troubleshooting process by making up nonexistent classes?


[EDIT]Also, if there is a particular reason why you need this rule please explain in detail. Because if this is about a (perceived) breach of security or some such thing I'd rather know right now.[/EDIT]

Last edited by unSpawn; 01-17-2015 at 06:18 AM. Reason: //Addendum
 
  


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