Re: SNORT has stopped alerting

["Farnsworth, Robert" <robert.farnsworth () hp com>]

Sorry I do not remember seeing any changes needed to the snort.conf file.

It was recommended to add a new snort.conf but no I have not done that.

I am running this same config. on another server with no issues.

This is the command line we run for snort.

/usr/local/bin/snort -A full -s -l /var/log/snortlogs -D -c /usr/local/snort/etc

From: Y M [mailto:snort () outlook com]
Sent: Thursday, July 17, 2014 10:57 AM
To: Farnsworth, Robert
Cc: snort-users
Subject: RE: [Snort-users] SNORT has stopped alerting


________________________________
From: robert.farnsworth () hp com<mailto:robert.farnsworth () hp com>
To: snort () outlook com<mailto:snort () outlook com>
CC: snort-users () lists sourceforge net<mailto: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<mailto:robert.farnsworth () hp com>
To: snort () outlook com<mailto:snort () outlook com>
CC: snort-users () lists sourceforge net<mailto: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<mailto:robert.farnsworth () hp com>
To: snort () outlook com<mailto:snort () outlook com>
CC: snort-users () lists sourceforge net<mailto: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<mailto:robert.farnsworth () hp com>
To: snort-users () lists sourceforge net<mailto: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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