Re: SNORT has stopped alerting

[Y M <snort () outlook com>]

From: robert.farnsworth () hp com
To: snort () outlook com
CC: snort-users () lists sourceforge net
Subject: RE: [Snort-users] SNORT has stopped alerting
Date: Thu, 17 Jul 2014 14:20:54 +0000









OK, we don’t have TCPDUMP on our Solaris server but I did run snoop in verbose mode, and see a lot of TCP traffic I did 
not notice anything for SSH, HTTP, etc.
The traffic you would see will depend on what are you expecting to see on the link monitored. If Snort is monitoring a 
link with all users activities and what not, then you should be seeing HTTP/S traffic, But if your sensor is monitoring 
a peculiar network segment, then look for the traffic you would expect to see on that segment.
 
I started snort with the –k  none option and it did create a new log it 334791 Jul 17 10:10 snort.log.1405605977, but I 
still get nothing in my alert log or
 the snort.log, file.
Please post your command line you use to run Snort. Also, did you make the necessary change in your snort.conf file as 
suggested earlier?
YM
 


From: Y M [mailto:snort () outlook com]


Sent: Wednesday, July 16, 2014 4:16 PM

To: Farnsworth, Robert

Cc: snort-users

Subject: RE: [Snort-users] SNORT has stopped alerting


 

Ok, can you verify that the NIC is getting packets, using tcpdump:

 


tcpdump -i ethX -nnXvv


 


Look for packets you are expecting to see, for example http, ssh, etc.. Also, if your run Snort with -k none, does 
anything change in the logs? If you can, run Snort in console mode (-A cmg)
 with the -k none, and let it run for a minute or so to see if it is getting packets and alerting based on packets 
captured.


 


YM




From:
robert.farnsworth () hp com

To: snort () outlook com

CC: snort-users () lists sourceforge net

Subject: RE: [Snort-users] SNORT has stopped alerting

Date: Wed, 16 Jul 2014 20:07:30 +0000

See Responses:
 
This looks good. While Snort is running, if you tail snort.alert (tail -f /var/log/snortlogs/snort.alert), do you see 
any data being added?

Nothing new is being added to this file. (var/log/snortlogs/snort.alert)
 
Also, when check the syslog (dependent on your Linux distro - /var/log/syslog or /var/log/messages), do you see any 
alerts there?
 
This is a Solaris system and we are getting alerts in /var/adm/messages (I don’t see anything for snort)
 
 


From: Y M [mailto:snort () outlook com]


Sent: Wednesday, July 16, 2014 3:44 PM

To: Farnsworth, Robert

Cc: snort-users

Subject: RE: [Snort-users] SNORT has stopped alerting


 

In addition to what Joel suggested, please see my comments below:




From: 
robert.farnsworth () hp com

To: snort () outlook com

CC: snort-users () lists sourceforge net

Subject: RE: [Snort-users] SNORT has stopped alerting

Date: Wed, 16 Jul 2014 18:53:26 +0000

I’ve tried to answer these the best I could. See Below.
 
 
1. Which output plugin are you using in your snort.conf (syslog, unified2, etc..)?
# Additional configuration for specific types of installs
output alert_unified2: filename snort.alert, limit 128, nostamp
output log_unified2: filename snort.log, limit 128, nostamp
 
It is recommended to use the unified2 plugin instead of the alert_unified2 and log_unified2. Then you can use the 
u2spewfoo (comes with snort) tool to read the unified2 log
 file:
 
output unified2: filename snort.log, limit 128, nostamp
 
# syslog
output alert_syslog: LOG_AUTH LOG_ALERT
 
Though the syslog output plugin works, it gives a warning and maybe deprecated as I came to know recently. You may want 
to use Barnyard2 in the future to handle syslog logging.
 
2. Where are you outputting the alerts (directory, database, barnyard2)?
Directory  -
/var/log/snortlogs
 
This is okay since you are outputting to this directory.
 
3. What is the final destination of the alerts (database, binary, text)?
 
Not sure about this sorry I am a novice to SNORT/UNIX, they are forwarded to an e-mail address. (Not sure if that is 
what you’re asking. )
 
This was to know how do you keep the logs at rest. You certainly answered these in 2 and 3.
 
4. How are you viewing the alert data (console, GUI)?
 
Console
 
Okay.
 
5. What are the rules/rules files included in snort.conf?
 
# site specific rules
include $RULE_PATH/local.rules
 
include $RULE_PATH/attack-responses.rules
include $RULE_PATH/backdoor.rules
include $RULE_PATH/bad-traffic.rules
include $RULE_PATH/blacklist.rules
include $RULE_PATH/botnet-cnc.rules
include $RULE_PATH/chat.rules
include $RULE_PATH/community.rules
include $RULE_PATH/content-replace.rules
include $RULE_PATH/ddos.rules
include $RULE_PATH/dns.rules
include $RULE_PATH/dos.rules
include $RULE_PATH/exploit.rules
include $RULE_PATH/finger.rules
include $RULE_PATH/ftp.rules
include $RULE_PATH/icmp.rules
include $RULE_PATH/icmp-info.rules
include $RULE_PATH/imap.rules
include $RULE_PATH/info.rules
include $RULE_PATH/misc.rules
include $RULE_PATH/multimedia.rules
include $RULE_PATH/mysql.rules
include $RULE_PATH/netbios.rules
include $RULE_PATH/nntp.rules
include $RULE_PATH/oracle.rules
include $RULE_PATH/other-ids.rules
include $RULE_PATH/p2p.rules
include $RULE_PATH/phishing-spam.rules
include $RULE_PATH/policy.rules
include $RULE_PATH/pop2.rules
include $RULE_PATH/pop3.rules
include $RULE_PATH/rpc.rules
include $RULE_PATH/rservices.rules
include $RULE_PATH/scada.rules
include $RULE_PATH/scan.rules
include $RULE_PATH/shellcode.rules
include $RULE_PATH/smtp.rules
include $RULE_PATH/snmp.rules
include $RULE_PATH/specific-threats.rules
include $RULE_PATH/spyware-put.rules
include $RULE_PATH/sql.rules
include $RULE_PATH/telnet.rules
include $RULE_PATH/tftp.rules
include $RULE_PATH/virus.rules
include $RULE_PATH/voip.rules
include $RULE_PATH/web-activex.rules
include $RULE_PATH/web-attacks.rules
include $RULE_PATH/web-cgi.rules
include $RULE_PATH/web-client.rules
include $RULE_PATH/web-coldfusion.rules
include $RULE_PATH/web-frontpage.rules
include $RULE_PATH/web-iis.rules
include $RULE_PATH/web-misc.rules
include $RULE_PATH/web-php.rules
include $RULE_PATH/x11.rules
 
 
# decoder and preprocessor event rules
include $PREPROC_RULE_PATH/preprocessor.rules
include $PREPROC_RULE_PATH/decoder.rules
include $PREPROC_RULE_PATH/sensitive-data.rules
 
###################################################
# Step #9: Customize your Shared Object Snort Rules
# For more information, see

http://vrt-sourcefire.blogspot.com/2009/01/using-vrt-certified-shared-object-rules.html
###################################################
 
# dynamic library rules
include $SO_RULE_PATH/bad-traffic.rules
include $SO_RULE_PATH/chat.rules
include $SO_RULE_PATH/dos.rules
include $SO_RULE_PATH/exploit.rules
include $SO_RULE_PATH/icmp.rules
include $SO_RULE_PATH/imap.rules
include $SO_RULE_PATH/misc.rules
include $SO_RULE_PATH/multimedia.rules
include $SO_RULE_PATH/netbios.rules
include $SO_RULE_PATH/nntp.rules
include $SO_RULE_PATH/p2p.rules
include $SO_RULE_PATH/smtp.rules
include $SO_RULE_PATH/sql.rules
include $SO_RULE_PATH/web-activex.rules
include $SO_RULE_PATH/web-client.rules
include $SO_RULE_PATH/web-iis.rules
include $SO_RULE_PATH/web-misc.rules
 
 
 This looks good. While Snort is running, if you tail snort.alert (tail -f /var/log/snortlogs/snort.alert),
 do you see any data being added? Also, when check the syslog (dependent on your Linux distro - /var/log/syslog or 
/var/log/messages), do you see any alerts there?
 
 
 
 


From: Y M [mailto:snort () outlook com]


Sent: Wednesday, July 16, 2014 2:39 PM

To: Farnsworth, Robert

Cc: snort-users

Subject: RE: [Snort-users] SNORT has stopped alerting


 


If more information is provided, you will get a better help:


 


1. Which output plugin are you using in your snort.conf (syslog, unified2, etc..)?


2. Where are you outputting the alerts (directory, database, barnyard2)?


3. What is the final destination of the alerts (database, binary, text)?

4. How are you viewing the alert data (console, GUI)?


5. What are the rules/rules files included in snort.conf?


 


If this was double posted, I blame the browser!


 


YM





From: 
robert.farnsworth () hp com

To: snort-users () lists sourceforge net

Date: Wed, 16 Jul 2014 17:45:26 +0000

Subject: [Snort-users] SNORT has stopped alerting

I have stopped receiving ALERTs from snort, I have checked and yes it is running, any troubleshooting tips would be 
appreciated.




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