[Snort-users] Ramen worm and Snort log entry

Subba Rao subba9 at ...530...
Sun Jun 17 03:59:56 EDT 2001


I have the following rules in my snort.conf and max-vision.conf, that should
enter a log entry into the "alerts" file for a Ramen worm probe.

====================================================================
alert TCP $EXTERNAL 27374 -> $INTERNAL any (msg: "IDS485/trojan-active-subseven
22"; flags: A+; content: "|0d0a5b52504c5d3030320d0a|"; reference:arachnids,485;)
alert TCP $EXTERNAL any -> $INTERNAL 27374 (msg: "IDS460/worm-ramen-asp-retriev
al-incoming"; flags: A+; content: "GET "; depth: 8; nocase;)
alert TCP $INTERNAL any -> $EXTERNAL 27374 (msg: "IDS461/worm-ramen-asp-retriev
al-outgoing"; flags: A+; content: "GET "; depth: 8; nocase;)
alert TCP $EXTERNAL 27374 -> $INTERNAL any (msg: "IDS279/trojan-active-subseven
21"; flags: SA; reference:arachnids,279;)
alert tcp $INTERNAL any -> $EXTERNAL 27374 (msg: "IDS461 - Ramen worm outgoing";
 flags: PA; content: "GET "; depth: 8; nocase;) 
alert tcp $EXTERNAL any -> $INTERNAL 27374 (msg: "IDS460 - Ramen worm incoming";
 flags: PA; content: "GET "; depth: 8; nocase;) 
====================================================================

I am also running tcpdump seperately to watch the traffic inbound and outbound.
The tcpdump logs and syslogs (ipchains entries) show quite a few probes for
the Ramen trojan. The Snort logs do not have any entries in the "alert" or
"portscan.log" files.

The following are the preprocessors in the snort.conf file. I have changed the
IP addresses of the systems/network here.

====================================================================
var INTERNAL  192.168.1.0/24
var EXTERNAL !$INTERNAL
var DNS_SERVERS 192.168.1.5/24

preprocessor http_decode: 80 8080
preprocessor minfrag: 128
preprocessor portscan: 1.1.1.1/2 5 3 portscan.log
preprocessor portscan-ignorehosts: 192.168.1.0/24

#include /usr/security/snort/etc/snort-vision.conf

output alert_full: alert
====================================================================

Why is Snort not logging any information about these trojan related alerts?

Thank you in advance for any help.
-- 

Subba Rao
subba9 at ...530...
http://members.home.net/subba9/

GPG public key ID 27FC9217
Key fingerprint = 2B4C 498E 1860 5A2B 6570  5852 7527 882A 27FC 9217




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