[Snort-users] Question about rules

Ricardo Barbosa ricardobarbosams at ...6873...
Wed Jan 27 08:15:17 EST 2010


Hi rmkml

answering questions

> what snort version you test please?

root at ...14740...:~# snort -V

   ,,_     -*> Snort! <*-
  o"  )~   Version 2.8.4.1 (Build 38)  
   ''''    By Martin Roesch & The Snort Team:
http://www.snort.org/team.html
           Copyright (C) 1998-2009 Sourcefire, Inc., et al.
           Using PCRE version: 7.8 2008-09-05

root at ...14740...:~# 


> Do you send your conf?

/etc/snort/snort.debian.conf
DEBIAN_SNORT_STARTUP="boot"
DEBIAN_SNORT_HOME_NET="20.0.0.0/8"
DEBIAN_SNORT_OPTIONS=""
DEBIAN_SNORT_INTERFACE="eth0"
DEBIAN_SNORT_SEND_STATS="true"
DEBIAN_SNORT_STATS_RCPT="root"
DEBIAN_SNORT_STATS_THRESHOLD="1"
/etc/snort/snort.conf
var HOME_NET $eth0_ADDRESS
var EXTERNAL_NET any
var DNS_SERVERS $HOME_NET
var SMTP_SERVERS $HOME_NET
var HTTP_SERVERS $HOME_NET
var SQL_SERVERS $HOME_NET
var TELNET_SERVERS $HOME_NET
var SNMP_SERVERS $HOME_NET
portvar HTTP_PORTS 80
portvar SHELLCODE_PORTS !80
portvar ORACLE_PORTS 1521
var AIM_SERVERS
[64.12.24.0/23,64.12.28.0/23,64.12.161.0/24,64.12.163.0/24,64.12.200.0/24,205.188.3.0/24,205.188.5.0/24,205.188.7.0/24,205.188.9.0/24,205.188.153.0/24,205.188.179.0/24,205.188.248.0/24]
var RULE_PATH /etc/snort/rules
var PREPROC_RULE_PATH /etc/snort/preproc_rules
dynamicpreprocessor directory /usr/lib/snort_dynamicpreprocessor/
dynamicengine /usr/lib/snort_dynamicengine/libsf_engine.so
preprocessor frag3_global: max_frags 65536
preprocessor frag3_engine: policy first detect_anomalies
preprocessor stream5_global: max_tcp 8192, track_tcp yes, \
                              track_udp no
preprocessor stream5_tcp: policy first, use_static_footprint_sizes
preprocessor http_inspect: global \
    iis_unicode_map unicode.map 1252 
preprocessor http_inspect_server: server default \
    profile all ports { 80 8080 8180 } oversize_dir_length 500
preprocessor rpc_decode: 111 32771
preprocessor bo
preprocessor ftp_telnet: global \
   encrypted_traffic yes \
   inspection_type stateful
preprocessor ftp_telnet_protocol: telnet \
   normalize \
   ayt_attack_thresh 200
preprocessor ftp_telnet_protocol: ftp server default \
   def_max_param_len 100 \
   alt_max_param_len 200 { CWD } \
   cmd_validity MODE < char ASBCZ > \
   cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \
   chk_str_fmt { USER PASS RNFR RNTO SITE MKD } \
   telnet_cmds yes \
   data_chan
preprocessor ftp_telnet_protocol: ftp client default \
   max_resp_len 256 \
   bounce yes \
   telnet_cmds yes
preprocessor smtp: \
  ports { 25 587 691 } \
  inspection_type stateful \
  normalize cmds \
  normalize_cmds { EXPN VRFY RCPT } \
  alt_max_command_line_len 260 { MAIL } \
  alt_max_command_line_len 300 { RCPT } \
  alt_max_command_line_len 500 { HELP HELO ETRN } \
  alt_max_command_line_len 255 { EXPN VRFY }
preprocessor sfportscan: proto  { all } \
                         memcap { 10000000 } \
                         sense_level { low }
preprocessor dcerpc2
preprocessor dcerpc2_server: default
preprocessor dns: \
    ports { 53 } \
    enable_rdata_overflow
preprocessor ssl: noinspect_encrypted, trustservers
output log_tcpdump: tcpdump.log
include classification.config
include reference.config
include $RULE_PATH/local.rules
include $RULE_PATH/bad-traffic.rules
include $RULE_PATH/exploit.rules
include $RULE_PATH/community-exploit.rules
include $RULE_PATH/scan.rules
include $RULE_PATH/finger.rules
include $RULE_PATH/ftp.rules
include $RULE_PATH/telnet.rules
include $RULE_PATH/rpc.rules
include $RULE_PATH/rservices.rules
include $RULE_PATH/dos.rules
include $RULE_PATH/community-dos.rules
include $RULE_PATH/ddos.rules
include $RULE_PATH/dns.rules
include $RULE_PATH/tftp.rules
include $RULE_PATH/web-cgi.rules
include $RULE_PATH/web-coldfusion.rules
include $RULE_PATH/web-iis.rules
include $RULE_PATH/web-frontpage.rules
include $RULE_PATH/web-misc.rules
include $RULE_PATH/web-client.rules
include $RULE_PATH/web-php.rules
include $RULE_PATH/community-sql-injection.rules
include $RULE_PATH/community-web-client.rules
include $RULE_PATH/community-web-dos.rules
include $RULE_PATH/community-web-iis.rules
include $RULE_PATH/community-web-misc.rules
include $RULE_PATH/community-web-php.rules
include $RULE_PATH/sql.rules
include $RULE_PATH/x11.rules
include $RULE_PATH/icmp.rules
include $RULE_PATH/netbios.rules
include $RULE_PATH/misc.rules
include $RULE_PATH/attack-responses.rules
include $RULE_PATH/oracle.rules
include $RULE_PATH/community-oracle.rules
include $RULE_PATH/mysql.rules
include $RULE_PATH/snmp.rules
include $RULE_PATH/community-ftp.rules
include $RULE_PATH/smtp.rules
include $RULE_PATH/community-smtp.rules
include $RULE_PATH/imap.rules
include $RULE_PATH/community-imap.rules
include $RULE_PATH/pop2.rules
include $RULE_PATH/pop3.rules
include $RULE_PATH/nntp.rules
include $RULE_PATH/community-nntp.rules
include $RULE_PATH/community-sip.rules
include $RULE_PATH/other-ids.rules
include $RULE_PATH/web-attacks.rules
include $RULE_PATH/backdoor.rules
include $RULE_PATH/community-bot.rules
include $RULE_PATH/community-virus.rules
include $RULE_PATH/experimental.rules
include threshold.conf

> snort cmd line starting please?

/usr/sbin/snort -m 027 -D -d -v -l /var/log/snort -u snort -g snort
-c /etc/snort/snort.conf -S HOME_NET=[10.0.0.0/8] -i eth0

> for example, maybe disable checksum with '-k none' on cmd line...
> you have created a html page (http reply server side), and you have 
> created a snort rule on client (to server) side...
> Regards
In desperation, I tried the following rules

alert tcp 10.0.0.0/8 80 -> any any (content:"teste rule"; msg:"TEST 
HTTP"; sid:100000000;) 
alert tcp any any <> any any (content:"teste rule"; msg:"TEST HTTP"; 
sid:100000000;) 
alert tcp any any <> any any (content:"teste rule"; http_client_body; 
msg:"TEST HTTP"; sid:100000000; depth:1000;) 

without sucess in all.

no idea where i can be wrong or missing some pre-processador. I thank

Regards.




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