[Snort-users] Snort could log attack but logfile remains empty.

Hadri Rahman hadri90 at ...11827...
Tue May 27 14:18:04 EDT 2014


Well, I used the command:

sudo /usr/local/snort/bin/snort -b -k none -u snort -g snort -c
/usr/local/snort/etc/snort.conf -i eth1

And when I looked at the /var/log/snort directory again, it shows that the
log files are still blank:

drwxr-xrwx 18 root  root  4096 Mei  27 14:17 ..
-rw-------  1 snort snort    0 Mei  27 14:18 tcpdump.log.1401171492
-rw-------  1 snort snort    0 Mei  27 14:18 snort.u2.1401171492
-rw-------  1 snort snort    0 Mei  27 14:18 snort.log
-rw-------  1 snort snort    0 Mei  27 14:49 snort.alert
drwxr-xrwx  2 snort snort 4096 Mei  27 14:51 .


On Tue, May 27, 2014 at 6:49 AM, beenph <beenph at ...11827...> wrote:

> If you want that your output directive work make sure that you do not
> the the -b command line switch and also -A full is the default you can
> skip that.
>
> Also make sure that you do not have checksum error on the interface
> your monitoring, you can add -k none to your snort command line
> argument to disable
> checksum validation to check if it can help.
>
> -elz
>
>
> On Mon, May 26, 2014 at 5:54 AM, Hadri Rahman <hadri90 at ...11827...> wrote:
> > Snort could log attack but logfile remains empty.
> >
> > I've set up Snort and Barnyard2 on my system using this
> > guide:
> http://www.symmetrixtech.com/articles/016-snortinstallguide2953.pdf
> >
> > I then added:
> >
> > ifconfig eth1 up
> > /usr/local/snort/bin/snort -D -u snort -g snort \
> > -c /usr/local/snort/etc/snort.conf -i eth1
> > /usr/local/bin/barnyard2 -c /usr/local/snort/etc/barnyard2.conf \
> > -d /var/log/snort \
> > -f snort.u2 \
> > -w /var/log/snort/barnyard2.waldo \
> > -D
> >
> > In my /etc/rc.local file.
> >
> > It was able to detect the attacks I've performed, but when I checked the
> > logfile, the logfile remained empty. I've also tried the commands:
> >
> > sudo /usr/local/snort/bin/snort -A full -u snort -g snort \
> > -c /usr/local/snort/etc/snort.conf -i eth1
> >
> > and
> >
> > sudo /usr/local/snort/bin/snort -dev -l /var/log/snort -b -u snort -g
> snort
> > -c /usr/local/snort/etc/snort.conf -i eth1
> >
> > But the results remained the same, but the second command would usually
> > result in something like this appearing on the screen:
> >
> > 05/22-10:49:13.435375 00:26:18:8B:75:8C -> FF:FF:FF:FF:FF:FF type:0x800
> > len:0x5C
> > 192.168.2.1:137 -> 192.168.2.127:137 UDP TTL:128 TOS:0x0 ID:1389
> IpLen:20
> > DgmLen:78
> > Len: 50
> > E2 2B 01 10 00 01 00 00 00 00 00 00 20 45 42 46  .+.......... EBF
> > 47 45 42 46 45 45 42 46 43 46 44 43 4F 45 47 46  GEBFEEBFCFDCOEGF
> > 4A 46 43 45 46 43 4F 45 44 45 50 41 41 00 00 20  JFCEFCOEDEPAA..
> > 00 01                                            ..
> >
> >
> =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
> >
> > 05/22-10:49:14.184843 00:26:18:8B:75:8C -> FF:FF:FF:FF:FF:FF type:0x800
> > len:0x5C
> > 192.168.2.1:137 -> 192.168.2.127:137 UDP TTL:128 TOS:0x0 ID:1390
> IpLen:20
> > DgmLen:78
> > Len: 50
> > E2 2B 01 10 00 01 00 00 00 00 00 00 20 45 42 46  .+.......... EBF
> > 47 45 42 46 45 45 42 46 43 46 44 43 4F 45 47 46  GEBFEEBFCFDCOEGF
> > 4A 46 43 45 46 43 4F 45 44 45 50 41 41 00 00 20  JFCEFCOEDEPAA..
> > 00 01                                            ..
> >
> > while the other will simply be blank until I press Control-C and it will
> > show the statistics of the packets it had captured during the period.
> >
> > I have checked and confirmed that Snort, Barnyard2 and MySQL are working,
> > the first two are also working under the user "Snort" and the group
> "Snort".
> > However, when I checked the file content of /var/log/snort using ls
> -lsat,
> > it showed this:
> >
> > drwxr-xrwx 18 root  root  4096 Mei  26 13:32 ..
> > -rw-------  1 snort snort    0 Mei  26 13:32 tcpdump.log.1401082370
> > -rw-------  1 snort snort    0 Mei  26 13:32 snort.u2.1401082370
> > -rw-------  1 snort snort    0 Mei  26 13:32 snort.log
> > -rw-------  1 snort snort    0 Mei  26 13:32 snort.alert
> > drwxr-xrwx  2 snort snort 4096 Mei  26 13:32 .
> >
> > Here's the output to Snort-V:
> >
> >   ,,_     -*> Snort! <*-
> >   o"  )~   Version 2.9.6.0 GRE (Build 47)
> >    ''''    By Martin Roesch & The Snort Team:
> > http://www.snort.org/snort/snort-team
> >            Copyright (C) 2014 Cisco and/or its affiliates. All rights
> > reserved.
> >            Copyright (C) 1998-2013 Sourcefire, Inc., et al.
> >            Using libpcap version 1.4.0
> >            Using PCRE version: 8.31 2012-07-06
> >            Using ZLIB version: 1.2.8
> >
> >            Rules Engine: SF_SNORT_DETECTION_ENGINE  Version 2.1  <Build
> 1>
> >            Rules Object: web-misc  Version 1.0  <Build 1>
> >            Rules Object: smtp  Version 1.0  <Build 1>
> >            Rules Object: exploit  Version 1.0  <Build 1>
> >            Rules Object: dos  Version 1.0  <Build 1>
> >            Rules Object: nntp  Version 1.0  <Build 1>
> >            Rules Object: imap  Version 1.0  <Build 1>
> >            Rules Object: specific-threats  Version 1.0  <Build 1>
> >            Rules Object: chat  Version 1.0  <Build 1>
> >            Rules Object: netbios  Version 1.0  <Build 1>
> >            Rules Object: web-client  Version 1.0  <Build 1>
> >            Rules Object: icmp  Version 1.0  <Build 1>
> >            Rules Object: p2p  Version 1.0  <Build 1>
> >            Rules Object: snmp  Version 1.0  <Build 1>
> >            Rules Object: multimedia  Version 1.0  <Build 1>
> >            Rules Object: web-iis  Version 1.0  <Build 1>
> >            Rules Object: bad-traffic  Version 1.0  <Build 1>
> >            Rules Object: web-activex  Version 1.0  <Build 1>
> >            Rules Object: misc  Version 1.0  <Build 1>
> >            Preprocessor Object: SF_POP  Version 1.0  <Build 1>
> >            Preprocessor Object: SF_SMTP  Version 1.1  <Build 9>
> >            Preprocessor Object: SF_REPUTATION  Version 1.1  <Build 1>
> >            Preprocessor Object: SF_SIP  Version 1.1  <Build 1>
> >            Preprocessor Object: SF_SSLPP  Version 1.1  <Build 4>
> >            Preprocessor Object: SF_DCERPC2  Version 1.0  <Build 3>
> >            Preprocessor Object: SF_SDF  Version 1.1  <Build 1>
> >            Preprocessor Object: SF_SSH  Version 1.1  <Build 3>
> >            Preprocessor Object: SF_FTPTELNET  Version 1.2  <Build 13>
> >            Preprocessor Object: SF_DNP3  Version 1.1  <Build 1>
> >            Preprocessor Object: SF_DNS  Version 1.1  <Build 4>
> >            Preprocessor Object: SF_IMAP  Version 1.0  <Build 1>
> >            Preprocessor Object: SF_GTP  Version 1.1  <Build 1>
> >            Preprocessor Object: SF_MODBUS  Version 1.1  <Build 1>
> >
> > And here's my snort.conf file, the changes made highlighted in bold:
> >
> > #--------------------------------------------------
> > #   VRT Rule Packages Snort.conf
> > #
> > #   For more information visit us at:
> > #     http://www.snort.org                   Snort Website
> > #     http://vrt-blog.snort.org/    Sourcefire VRT Blog
> > #
> > #     Mailing list Contact:      snort-sigs at lists.sourceforge.net
> > #     False Positive reports:    fp at ...1935...
> > #     Snort bugs:                bugs at ...950...
> > #
> > #     Compatible with Snort Versions:
> > #     VERSIONS : 2.9.6.0
> > #
> > #     Snort build options:
> > #     OPTIONS : --enable-gre --enable-mpls --enable-targetbased
> --enable-ppm
> > --enable-perfprofiling --enable-zlib --enable-active-response
> > --enable-normalizer --enable-reload --enable-react --enable-flexresp3
> > #
> > #     Additional information:
> > #     This configuration file enables active response, to run snort in
> > #     test mode -T you are required to supply an interface -i <interface>
> > #     or test mode will fail to fully validate the configuration and
> > #     exit with a FATAL error
> > #--------------------------------------------------
> >
> > ###################################################
> > # This file contains a sample snort configuration.
> > # You should take the following steps to create your own custom
> > configuration:
> > #
> > #  1) Set the network variables.
> > #  2) Configure the decoder
> > #  3) Configure the base detection engine
> > #  4) Configure dynamic loaded libraries
> > #  5) Configure preprocessors
> > #  6) Configure output plugins
> > #  7) Customize your rule set
> > #  8) Customize preprocessor and decoder rule set
> > #  9) Customize shared object rule set
> > ###################################################
> >
> > ###################################################
> > # Step #1: Set the network variables.  For more information, see
> > README.variables
> > ###################################################
> >
> > # Setup the network addresses you are protecting
> > var HOME_NET any
> >
> > # Set up the external network addresses. Leave as "any" in most
> situations
> > var EXTERNAL_NET any
> >
> > # List of DNS servers on your network
> > var DNS_SERVERS $HOME_NET
> >
> > # List of SMTP servers on your network
> > var SMTP_SERVERS $HOME_NET
> >
> > # List of web servers on your network
> > var HTTP_SERVERS $HOME_NET
> >
> > # List of sql servers on your network
> > var SQL_SERVERS $HOME_NET
> >
> > # List of telnet servers on your network
> > var TELNET_SERVERS $HOME_NET
> >
> > # List of ssh servers on your network
> > var SSH_SERVERS $HOME_NET
> >
> > # List of ftp servers on your network
> > var FTP_SERVERS $HOME_NET
> >
> > # List of sip servers on your network
> > var SIP_SERVERS $HOME_NET
> >
> > # List of ports you run web servers on
> > portvar HTTP_PORTS
> >
> [36,80,81,82,83,84,85,86,87,88,89,90,311,383,555,591,593,631,801,808,818,901,972,1158,1220,1414,1533,1741,1830,2231,2301,2381,2809,3029,3037,3057,3128,3443,3702,4000,4343,4848,5117,5250,6080,6173,6988,7000,7001,7071,7144,7145,7510,7770,7777,7779,8000,8008,8014,8028,8080,8081,8082,8085,8088,8090,8118,8123,8180,8181,8222,8243,8280,8300,8500,8509,8800,8888,8899,9000,9060,9080,9090,9091,9111,9443,9999,10000,11371,12601,15489,29991,33300,34412,34443,34444,41080,44449,50000,50002,51423,53331,55252,55555,56712]
> >
> > # List of ports you want to look for SHELLCODE on.
> > portvar SHELLCODE_PORTS !80
> >
> > # List of ports you might see oracle attacks on
> > portvar ORACLE_PORTS 1024:
> >
> > # List of ports you want to look for SSH connections on:
> > portvar SSH_PORTS 22
> >
> > # List of ports you run ftp servers on
> > portvar FTP_PORTS [21,2100,3535]
> >
> > # List of ports you run SIP servers on
> > portvar SIP_PORTS [5060,5061,5600]
> >
> > # List of file data ports for file inspection
> > portvar FILE_DATA_PORTS [$HTTP_PORTS,110,143]
> >
> > # List of GTP ports for GTP preprocessor
> > portvar GTP_PORTS [2123,2152,3386]
> >
> > # other variables, these should not be modified
> > ipvar 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
> ]
> >
> > # Path to your rules files (this can be a relative path)
> > # Note for Windows users:  You are advised to make this an absolute path,
> > # such as:  c:\snort\rules
> > var RULE_PATH ../rules
> > var SO_RULE_PATH ../so_rules
> > var PREPROC_RULE_PATH ../preproc_rules
> >
> > # If you are using reputation preprocessor set these
> > var WHITE_LIST_PATH /usr/local/snort/rules
> > var BLACK_LIST_PATH /usr/local/snort/rules
> >
> > ###################################################
> > # Step #2: Configure the decoder.  For more information, see
> README.decode
> > ###################################################
> >
> > # Stop generic decode events:
> > config disable_decode_alerts
> >
> > # Stop Alerts on experimental TCP options
> > config disable_tcpopt_experimental_alerts
> >
> > # Stop Alerts on obsolete TCP options
> > config disable_tcpopt_obsolete_alerts
> >
> > # Stop Alerts on T/TCP alerts
> > config disable_tcpopt_ttcp_alerts
> >
> > # Stop Alerts on all other TCPOption type events:
> > config disable_tcpopt_alerts
> >
> > # Stop Alerts on invalid ip options
> > config disable_ipopt_alerts
> >
> > # Alert if value in length field (IP, TCP, UDP) is greater th elength of
> the
> > packet
> > # config enable_decode_oversized_alerts
> >
> > # Same as above, but drop packet if in Inline mode (requires
> > enable_decode_oversized_alerts)
> > # config enable_decode_oversized_drops
> >
> > # Configure IP / TCP checksum mode
> > config checksum_mode: all
> >
> > # Configure maximum number of flowbit references.  For more information,
> see
> > README.flowbits
> > # config flowbits_size: 64
> >
> > # Configure ports to ignore
> > # config ignore_ports: tcp 21 6667:6671 1356
> > # config ignore_ports: udp 1:17 53
> >
> > # Configure active response for non inline operation. For more
> information,
> > see REAMDE.active
> > # config response: eth0 attempts 2
> >
> > # Configure DAQ related options for inline operation. For more
> information,
> > see README.daq
> > #
> > # config daq: <type>
> > # config daq_dir: <dir>
> > # config daq_mode: <mode>
> > # config daq_var: <var>
> > #
> > # <type> ::= pcap | afpacket | dump | nfq | ipq | ipfw
> > # <mode> ::= read-file | passive | inline
> > # <var> ::= arbitrary <name>=<value passed to DAQ
> > # <dir> ::= path as to where to look for DAQ module so's
> >
> > # Configure specific UID and GID to run snort as after dropping privs.
> For
> > more information see snort -h command line options
> > #
> > # config set_gid:
> > # config set_uid:
> >
> > # Configure default snaplen. Snort defaults to MTU of in use interface.
> For
> > more information see README
> > #
> > # config snaplen:
> > #
> >
> > # Configure default bpf_file to use for filtering what traffic reaches
> > snort. For more information see snort -h command line options (-F)
> > #
> > # config bpf_file:
> > #
> >
> > # Configure default log directory for snort to log to.  For more
> information
> > see snort -h command line options (-l)
> > #
> > # config logdir:
> >
> >
> > ###################################################
> > # Step #3: Configure the base detection engine.  For more information,
> see
> > README.decode
> > ###################################################
> >
> > # Configure PCRE match limitations
> > config pcre_match_limit: 3500
> > config pcre_match_limit_recursion: 1500
> >
> > # Configure the detection engine  See the Snort Manual, Configuring
> Snort -
> > Includes - Config
> > config detection: search-method ac-split search-optimize max-pattern-len
> 20
> >
> > # Configure the event queue.  For more information, see
> README.event_queue
> > config event_queue: max_queue 8 log 5 order_events content_length
> >
> > ###################################################
> > ## Configure GTP if it is to be used.
> > ## For more information, see README.GTP
> > ####################################################
> >
> > # config enable_gtp
> >
> > ###################################################
> > # Per packet and rule latency enforcement
> > # For more information see README.ppm
> > ###################################################
> >
> > # Per Packet latency configuration
> > #config ppm: max-pkt-time 250, \
> > #   fastpath-expensive-packets, \
> > #   pkt-log
> >
> > # Per Rule latency configuration
> > #config ppm: max-rule-time 200, \
> > #   threshold 3, \
> > #   suspend-expensive-rules, \
> > #   suspend-timeout 20, \
> > #   rule-log alert
> >
> > ###################################################
> > # Configure Perf Profiling for debugging
> > # For more information see README.PerfProfiling
> > ###################################################
> >
> > #config profile_rules: print all, sort avg_ticks
> > #config profile_preprocs: print all, sort avg_ticks
> >
> > ###################################################
> > # Configure protocol aware flushing
> > # For more information see README.stream5
> > ###################################################
> > config paf_max: 16000
> >
> > ###################################################
> > # Step #4: Configure dynamic loaded libraries.
> > # For more information, see Snort Manual, Configuring Snort - Dynamic
> > Modules
> > ###################################################
> >
> > # path to dynamic preprocessor libraries
> > dynamicpreprocessor directory
> > /usr/local/snort/lib/snort_dynamicpreprocessor/
> >
> > # path to base preprocessor engine
> > dynamicengine /usr/local/snort/lib/snort_dynamicengine/libsf_engine.so
> >
> > # path to dynamic rules libraries
> > dynamicdetection directory /usr/local/snort/lib/snort_dynamicrules
> >
> > ###################################################
> > # Step #5: Configure preprocessors
> > # For more information, see the Snort Manual, Configuring Snort -
> > Preprocessors
> > ###################################################
> >
> > # GTP Control Channle Preprocessor. For more information, see README.GTP
> > # preprocessor gtp: ports { 2123 3386 2152 }
> >
> > # Inline packet normalization. For more information, see README.normalize
> > # Does nothing in IDS mode
> > preprocessor normalize_ip4
> > preprocessor normalize_tcp: ips ecn stream
> > preprocessor normalize_icmp4
> > preprocessor normalize_ip6
> > preprocessor normalize_icmp6
> >
> > # Target-based IP defragmentation.  For more inforation, see README.frag3
> > preprocessor frag3_global: max_frags 65536
> > preprocessor frag3_engine: policy windows detect_anomalies overlap_limit
> 10
> > min_fragment_length 100 timeout 180
> >
> > # Target-Based stateful inspection/stream reassembly.  For more
> inforation,
> > see README.stream5
> > preprocessor stream5_global: track_tcp yes, \
> >    track_udp yes, \
> >    track_icmp no, \
> >    max_tcp 262144, \
> >    max_udp 131072, \
> >    max_active_responses 2, \
> >    min_response_seconds 5
> > preprocessor stream5_tcp: policy windows, detect_anomalies, require_3whs
> > 180, \
> >    overlap_limit 10, small_segments 3 bytes 150, timeout 180, \
> >     ports client 21 22 23 25 42 53 70 79 109 110 111 113 119 135 136 137
> 139
> > 143 \
> >         161 445 513 514 587 593 691 1433 1521 1741 2100 3306 6070 6665
> 6666
> > 6667 6668 6669 \
> >         7000 8181 32770 32771 32772 32773 32774 32775 32776 32777 32778
> > 32779, \
> >     ports both 36 80 81 82 83 84 85 86 87 88 89 90 110 311 383 443 465
> 563
> > 555 591 593 631 636 801 808 818 901 972 989 992 993 994 995 1158 1220
> 1414
> > 1533 1741 1830 2231 2301 2381 2809 3029 3037 3057 3128 3443 3702 4000
> 4343
> > 4848 5117 5250 6080 6173 6988 7907 7000 7001 7071 7144 7145 7510 7802
> 7770
> > 7777 7779 \
> >         7801 7900 7901 7902 7903 7904 7905 7906 7908 7909 7910 7911 7912
> > 7913 7914 7915 7916 \
> >         7917 7918 7919 7920 8000 8008 8014 8028 8080 8081 8082 8085 8088
> > 8090 8118 8123 8180 8181 8222 8243 8280 8300 8500 8509 8800 8888 8899
> 9000
> > 9060 9080 9090 9091 9111 9443 9999 10000 11371 12601 15489 29991 33300
> 34412
> > 34443 34444 41080 44449 50000 50002 51423 53331 55252 55555 56712
> > preprocessor stream5_udp: timeout 180
> >
> > # performance statistics.  For more information, see the Snort Manual,
> > Configuring Snort - Preprocessors - Performance Monitor
> > # preprocessor perfmonitor: time 300 file /var/snort/snort.stats pktcnt
> > 10000
> >
> > # HTTP normalization and anomaly detection.  For more information, see
> > README.http_inspect
> > preprocessor http_inspect: global iis_unicode_map unicode.map 1252
> > compress_depth 65535 decompress_depth 65535
> > preprocessor http_inspect_server: server default \
> >     http_methods { GET POST PUT SEARCH MKCOL COPY MOVE LOCK UNLOCK NOTIFY
> > POLL BCOPY BDELETE BMOVE LINK UNLINK OPTIONS HEAD DELETE TRACE TRACK
> CONNECT
> > SOURCE SUBSCRIBE UNSUBSCRIBE PROPFIND PROPPATCH BPROPFIND BPROPPATCH
> > RPC_CONNECT PROXY_SUCCESS BITS_POST CCM_POST SMS_POST RPC_IN_DATA
> > RPC_OUT_DATA RPC_ECHO_DATA } \
> >     chunk_length 500000 \
> >     server_flow_depth 0 \
> >     client_flow_depth 0 \
> >     post_depth 65495 \
> >     oversize_dir_length 500 \
> >     max_header_length 750 \
> >     max_headers 100 \
> >     max_spaces 200 \
> >     small_chunk_length { 10 5 } \
> >     ports { 36 80 81 82 83 84 85 86 87 88 89 90 311 383 555 591 593 631
> 801
> > 808 818 901 972 1158 1220 1414 1741 1830 2231 2301 2381 2809 3029 3037
> 3057
> > 3128 3443 3702 4000 4343 4848 5117 5250 6080 6173 6988 7000 7001 7071
> 7144
> > 7145 7510 7770 7777 7779 8000 8008 8014 8028 8080 8081 8082 8085 8088
> 8090
> > 8118 8123 8180 8181 8222 8243 8280 8300 8500 8509 8800 8888 8899 9000
> 9060
> > 9080 9090 9091 9111 9443 9999 10000 11371 12601 15489 29991 33300 34412
> > 34443 34444 41080 44449 50000 50002 51423 53331 55252 55555 56712 } \
> >     non_rfc_char { 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 } \
> >     enable_cookie \
> >     extended_response_inspection \
> >     inspect_gzip \
> >     normalize_utf \
> >     unlimited_decompress \
> >     normalize_javascript \
> >     apache_whitespace no \
> >     ascii no \
> >     bare_byte no \
> >     directory no \
> >     double_decode no \
> >     iis_backslash no \
> >     iis_delimiter no \
> >     iis_unicode no \
> >     multi_slash no \
> >     utf_8 no \
> >     u_encode yes \
> >     webroot no
> >
> > # ONC-RPC normalization and anomaly detection.  For more information, see
> > the Snort Manual, Configuring Snort - Preprocessors - RPC Decode
> > preprocessor rpc_decode: 111 32770 32771 32772 32773 32774 32775 32776
> 32777
> > 32778 32779 no_alert_multiple_requests no_alert_large_fragments
> > no_alert_incomplete
> >
> > # Back Orifice detection.
> > preprocessor bo
> >
> > # FTP / Telnet normalization and anomaly detection.  For more
> information,
> > see README.ftptelnet
> > preprocessor ftp_telnet: global inspection_type stateful
> encrypted_traffic
> > no check_encrypted
> > preprocessor ftp_telnet_protocol: telnet \
> >     ayt_attack_thresh 20 \
> >     normalize ports { 23 } \
> >     detect_anomalies
> > preprocessor ftp_telnet_protocol: ftp server default \
> >     def_max_param_len 100 \
> >     ports { 21 2100 3535 } \
> >     telnet_cmds yes \
> >     ignore_telnet_erase_cmds yes \
> >     ftp_cmds { ABOR ACCT ADAT ALLO APPE AUTH CCC CDUP } \
> >     ftp_cmds { CEL CLNT CMD CONF CWD DELE ENC EPRT } \
> >     ftp_cmds { EPSV ESTA ESTP FEAT HELP LANG LIST LPRT } \
> >     ftp_cmds { LPSV MACB MAIL MDTM MIC MKD MLSD MLST } \
> >     ftp_cmds { MODE NLST NOOP OPTS PASS PASV PBSZ PORT } \
> >     ftp_cmds { PROT PWD QUIT REIN REST RETR RMD RNFR } \
> >     ftp_cmds { RNTO SDUP SITE SIZE SMNT STAT STOR STOU } \
> >     ftp_cmds { STRU SYST TEST TYPE USER XCUP XCRC XCWD } \
> >     ftp_cmds { XMAS XMD5 XMKD XPWD XRCP XRMD XRSQ XSEM } \
> >     ftp_cmds { XSEN XSHA1 XSHA256 } \
> >     alt_max_param_len 0 { ABOR CCC CDUP ESTA FEAT LPSV NOOP PASV PWD QUIT
> > REIN STOU SYST XCUP XPWD } \
> >     alt_max_param_len 200 { ALLO APPE CMD HELP NLST RETR RNFR STOR STOU
> XMKD
> > } \
> >     alt_max_param_len 256 { CWD RNTO } \
> >     alt_max_param_len 400 { PORT } \
> >     alt_max_param_len 512 { SIZE } \
> >     chk_str_fmt { ACCT ADAT ALLO APPE AUTH CEL CLNT CMD } \
> >     chk_str_fmt { CONF CWD DELE ENC EPRT EPSV ESTP HELP } \
> >     chk_str_fmt { LANG LIST LPRT MACB MAIL MDTM MIC MKD } \
> >     chk_str_fmt { MLSD MLST MODE NLST OPTS PASS PBSZ PORT } \
> >     chk_str_fmt { PROT REST RETR RMD RNFR RNTO SDUP SITE } \
> >     chk_str_fmt { SIZE SMNT STAT STOR STRU TEST TYPE USER } \
> >     chk_str_fmt { XCRC XCWD XMAS XMD5 XMKD XRCP XRMD XRSQ } \
> >     chk_str_fmt { XSEM XSEN XSHA1 XSHA256 } \
> >     cmd_validity ALLO < int [ char R int ] > \
> >     cmd_validity EPSV < [ { char 12 | char A char L char L } ] > \
> >     cmd_validity MACB < string > \
> >     cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \
> >     cmd_validity MODE < char ASBCZ > \
> >     cmd_validity PORT < host_port > \
> >     cmd_validity PROT < char CSEP > \
> >     cmd_validity STRU < char FRPO [ string ] > \
> >     cmd_validity TYPE < { char AE [ char NTC ] | char I | char L [
> number ]
> > } >
> > preprocessor ftp_telnet_protocol: ftp client default \
> >     max_resp_len 256 \
> >     bounce yes \
> >     ignore_telnet_erase_cmds yes \
> >     telnet_cmds yes
> >
> >
> > # SMTP normalization and anomaly detection.  For more information, see
> > README.SMTP
> > preprocessor smtp: ports { 25 465 587 691 } \
> >     inspection_type stateful \
> >     b64_decode_depth 0 \
> >     qp_decode_depth 0 \
> >     bitenc_decode_depth 0 \
> >     uu_decode_depth 0 \
> >     log_mailfrom \
> >     log_rcptto \
> >     log_filename \
> >     log_email_hdrs \
> >     normalize cmds \
> >     normalize_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM
> ESND
> > ESOM ETRN EVFY } \
> >     normalize_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT
> RSET
> > SAML SEND SOML } \
> >     normalize_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT
> X-DRCP
> > X-ERCP X-EXCH50 } \
> >     normalize_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN
> > XLICENSE XQUE XSTA XTRN XUSR } \
> >     max_command_line_len 512 \
> >     max_header_line_len 1000 \
> >     max_response_line_len 512 \
> >     alt_max_command_line_len 260 { MAIL } \
> >     alt_max_command_line_len 300 { RCPT } \
> >     alt_max_command_line_len 500 { HELP HELO ETRN EHLO } \
> >     alt_max_command_line_len 255 { EXPN VRFY ATRN SIZE BDAT DEBUG EMAL
> ESAM
> > ESND ESOM EVFY IDENT NOOP RSET } \
> >     alt_max_command_line_len 246 { SEND SAML SOML AUTH TURN ETRN DATA
> RSET
> > QUIT ONEX QUEU STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR
> XAUTH
> > XCIR XEXCH50 XGEN XLICENSE XQUE XSTA XTRN XUSR } \
> >     valid_cmds { ATRN AUTH BDAT CHUNKING DATA DEBUG EHLO EMAL ESAM ESND
> ESOM
> > ETRN EVFY } \
> >     valid_cmds { EXPN HELO HELP IDENT MAIL NOOP ONEX QUEU QUIT RCPT RSET
> > SAML SEND SOML } \
> >     valid_cmds { STARTTLS TICK TIME TURN TURNME VERB VRFY X-ADAT X-DRCP
> > X-ERCP X-EXCH50 } \
> >     valid_cmds { X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN
> XLICENSE
> > XQUE XSTA XTRN XUSR } \
> >     xlink2state { enabled }
> >
> > # Portscan detection.  For more information, see README.sfportscan
> > # preprocessor sfportscan: proto  { all } memcap { 10000000 }
> sense_level {
> > low }
> >
> > # ARP spoof detection.  For more information, see the Snort Manual -
> > Configuring Snort - Preprocessors - ARP Spoof Preprocessor
> > # preprocessor arpspoof
> > # preprocessor arpspoof_detect_host: 192.168.40.1 f0:0f:00:f0:0f:00
> >
> > # SSH anomaly detection.  For more information, see README.ssh
> > preprocessor ssh: server_ports { 22 } \
> >                   autodetect \
> >                   max_client_bytes 19600 \
> >                   max_encrypted_packets 20 \
> >                   max_server_version_len 100 \
> >                   enable_respoverflow enable_ssh1crc32 \
> >                   enable_srvoverflow enable_protomismatch
> >
> > # SMB / DCE-RPC normalization and anomaly detection.  For more
> information,
> > see README.dcerpc2
> > preprocessor dcerpc2: memcap 102400, events [co ]
> > preprocessor dcerpc2_server: default, policy WinXP, \
> >     detect [smb [139,445], tcp 135, udp 135, rpc-over-http-server 593], \
> >     autodetect [tcp 1025:, udp 1025:, rpc-over-http-server 1025:], \
> >     smb_max_chain 3, smb_invalid_shares ["C$", "D$", "ADMIN$"]
> >
> > # DNS anomaly detection.  For more information, see README.dns
> > preprocessor dns: ports { 53 } enable_rdata_overflow
> >
> > # SSL anomaly detection and traffic bypass.  For more information, see
> > README.ssl
> > preprocessor ssl: ports { 443 465 563 636 989 992 993 994 995 7801 7802
> 7900
> > 7901 7902 7903 7904 7905 7906 7907 7908 7909 7910 7911 7912 7913 7914
> 7915
> > 7916 7917 7918 7919 7920 }, trustservers, noinspect_encrypted
> >
> > # SDF sensitive data preprocessor.  For more information see
> > README.sensitive_data
> > preprocessor sensitive_data: alert_threshold 25
> >
> > # SIP Session Initiation Protocol preprocessor.  For more information see
> > README.sip
> > preprocessor sip: max_sessions 40000, \
> >    ports { 5060 5061 5600 }, \
> >    methods { invite \
> >              cancel \
> >              ack \
> >              bye \
> >              register \
> >              options \
> >              refer \
> >              subscribe \
> >              update \
> >              join \
> >              info \
> >              message \
> >              notify \
> >              benotify \
> >              do \
> >              qauth \
> >              sprack \
> >              publish \
> >              service \
> >              unsubscribe \
> >              prack }, \
> >    max_uri_len 512, \
> >    max_call_id_len 80, \
> >    max_requestName_len 20, \
> >    max_from_len 256, \
> >    max_to_len 256, \
> >    max_via_len 1024, \
> >    max_contact_len 512, \
> >    max_content_len 2048
> >
> > # IMAP preprocessor.  For more information see README.imap
> > preprocessor imap: \
> >    ports { 143 } \
> >    b64_decode_depth 0 \
> >    qp_decode_depth 0 \
> >    bitenc_decode_depth 0 \
> >    uu_decode_depth 0
> >
> > # POP preprocessor. For more information see README.pop
> > preprocessor pop: \
> >    ports { 110 } \
> >    b64_decode_depth 0 \
> >    qp_decode_depth 0 \
> >    bitenc_decode_depth 0 \
> >    uu_decode_depth 0
> >
> > # Modbus preprocessor. For more information see README.modbus
> > preprocessor modbus: ports { 502 }
> >
> > # DNP3 preprocessor. For more information see README.dnp3
> > preprocessor dnp3: ports { 20000 } \
> >    memcap 262144 \
> >    check_crc
> >
> > # Reputation preprocessor. For more information see README.reputation
> > preprocessor reputation: \
> >    memcap 500, \
> >    priority whitelist, \
> >    nested_ip inner, \
> >    whitelist $WHITE_LIST_PATH/white_list.rules, \
> >    blacklist $BLACK_LIST_PATH/black_list.rules
> >
> > ###################################################
> > # Step #6: Configure output plugins
> > # For more information, see Snort Manual, Configuring Snort - Output
> Modules
> > ###################################################
> >
> > # unified2
> > # Recommended for most installs
> > # output unified2: filename merged.log, limit 128, nostamp,
> > mpls_event_types, vlan_event_types
> > output unified2: filename snort.u2, limit 128
> > # 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
> >
> > # syslog
> > output alert_syslog: LOG_AUTH LOG_ALERT
> >
> > # pcap
> > output log_tcpdump: tcpdump.log
> >
> > # metadata reference data.  do not modify these lines
> > include classification.config
> > include reference.config
> >
> >
> > ###################################################
> > # Step #7: Customize your rule set
> > # For more information, see Snort Manual, Writing Snort Rules
> > #
> > # NOTE: All categories are enabled in this conf file
> > ###################################################
> >
> > # site specific rules
> > include $RULE_PATH/local.rules
> >
> > include $RULE_PATH/app-detect.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/browser-chrome.rules
> > include $RULE_PATH/browser-firefox.rules
> > include $RULE_PATH/browser-ie.rules
> > include $RULE_PATH/browser-other.rules
> > include $RULE_PATH/browser-plugins.rules
> > include $RULE_PATH/browser-webkit.rules
> > include $RULE_PATH/chat.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/experimental.rules
> > include $RULE_PATH/exploit-kit.rules
> > include $RULE_PATH/exploit.rules
> > include $RULE_PATH/file-executable.rules
> > include $RULE_PATH/file-flash.rules
> > include $RULE_PATH/file-identify.rules
> > include $RULE_PATH/file-image.rules
> > include $RULE_PATH/file-java.rules
> > include $RULE_PATH/file-multimedia.rules
> > include $RULE_PATH/file-office.rules
> > include $RULE_PATH/file-other.rules
> > include $RULE_PATH/file-pdf.rules
> > include $RULE_PATH/finger.rules
> > include $RULE_PATH/ftp.rules
> > include $RULE_PATH/icmp-info.rules
> > include $RULE_PATH/icmp.rules
> > include $RULE_PATH/imap.rules
> > include $RULE_PATH/indicator-compromise.rules
> > include $RULE_PATH/indicator-obfuscation.rules
> > include $RULE_PATH/indicator-scan.rules
> > include $RULE_PATH/indicator-shellcode.rules
> > include $RULE_PATH/info.rules
> > include $RULE_PATH/malware-backdoor.rules
> > include $RULE_PATH/malware-cnc.rules
> > include $RULE_PATH/malware-other.rules
> > include $RULE_PATH/malware-tools.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/os-linux.rules
> > include $RULE_PATH/os-mobile.rules
> > include $RULE_PATH/os-other.rules
> > include $RULE_PATH/os-solaris.rules
> > include $RULE_PATH/os-windows.rules
> > include $RULE_PATH/other-ids.rules
> > include $RULE_PATH/p2p.rules
> > include $RULE_PATH/phishing-spam.rules
> > include $RULE_PATH/policy-multimedia.rules
> > include $RULE_PATH/policy-other.rules
> > include $RULE_PATH/policy.rules
> > include $RULE_PATH/policy-social.rules
> > include $RULE_PATH/policy-spam.rules
> > include $RULE_PATH/pop2.rules
> > include $RULE_PATH/pop3.rules
> > include $RULE_PATH/protocol-dns.rules
> > include $RULE_PATH/protocol-finger.rules
> > include $RULE_PATH/protocol-ftp.rules
> > include $RULE_PATH/protocol-icmp.rules
> > include $RULE_PATH/protocol-imap.rules
> > include $RULE_PATH/protocol-nntp.rules
> > include $RULE_PATH/protocol-pop.rules
> > include $RULE_PATH/protocol-rpc.rules
> > include $RULE_PATH/protocol-scada.rules
> > include $RULE_PATH/protocol-services.rules
> > include $RULE_PATH/protocol-snmp.rules
> > include $RULE_PATH/protocol-telnet.rules
> > include $RULE_PATH/protocol-tftp.rules
> > include $RULE_PATH/protocol-voip.rules
> > include $RULE_PATH/pua-adware.rules
> > include $RULE_PATH/pua-other.rules
> > include $RULE_PATH/pua-p2p.rules
> > include $RULE_PATH/pua-toolbars.rules
> > include $RULE_PATH/rpc.rules
> > include $RULE_PATH/rservices.rules
> > include $RULE_PATH/scada.rules
> > include $RULE_PATH/scan.rules
> > include $RULE_PATH/server-apache.rules
> > include $RULE_PATH/server-iis.rules
> > include $RULE_PATH/server-mail.rules
> > include $RULE_PATH/server-mssql.rules
> > include $RULE_PATH/server-mysql.rules
> > include $RULE_PATH/server-oracle.rules
> > include $RULE_PATH/server-other.rules
> > include $RULE_PATH/server-samba.rules
> > include $RULE_PATH/server-webapp.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
> >
> > ###################################################
> > # Step #8: Customize your preprocessor and decoder alerts
> > # For more information, see README.decoder_preproc_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-blog.snort.org/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/snmp.rules
> > # include $SO_RULE_PATH/specific-threats.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
> >
> > # Event thresholding or suppression commands. See threshold.conf
> > include threshold.conf
> >
> >
> ------------------------------------------------------------------------------
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> > Snort-users at lists.sourceforge.net
> > Go to this URL to change user options or unsubscribe:
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> >
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