Snort mailing list archives

Re: Problem with content option

From: Y M <snort () outlook com>
Date: Mon, 29 Dec 2014 04:29:34 +0000

For the rule with the "tree" content, use the "file_data" content modifier, such as:

alert tcp any any -> any any (msg:"treeHit!"; file_data; content:"tree"; sid:1000001;)

More info on why to use "file_data": http://manual.snort.org/node32.html#SECTION004528000000000000000

YM
Date: Sat, 27 Dec 2014 10:50:04 +0330
From: mark.greenman.014 () gmail com
To: snort-users () lists sourceforge net
Subject: [Snort-users] Problem with content option

Hi. I am trying to use "content" option to detect some text in a webpage body. It is a simple webpage and it is all 
transmitted in one TCP segment. I have no idea why it can not be detected by snort. The problem is that the content in 
the HTTP header can be detected but the content of HTTP body can not. I have attached the snort local.rules file, snort 
config file and a pcap file for the transmitted traffic by the email. Could you please help me understand why it can 
not work.

Here is the part for http_inspect configuration in the snort config file:
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 { 80 81 311 383 591 593 901 1220 1414 1741 1830 2301 2381 2809 3037 3128 3702 4343 4848 5250 6988 7000 7001 
7144 7145 7510 7777 7779 8000 8008 8014 8028 8080 8085 8088 8090 8118 8123 8180 8181 8243 8280 8300 8800 8888 8899 9000 
9060 9080 9090 9091 9443 9999 11371 34443 34444 41080 50002 55555 } \
    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

Is there a problem with this part?

Thanks


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sponsored by Intel and developed in partnership with Slashdot Media, is your
hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net

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Current thread:

Problem with content option Mark Greenman (Dec 28)
- Re: Problem with content option Y M (Dec 28)