<br><br><div class="gmail_quote">On Wed, Mar 27, 2013 at 1:03 PM, Jose Paulo <span dir="ltr"><<a href="mailto:paulo@sistemasolar.com.br" target="_blank">paulo@sistemasolar.com.br</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hello all.<br>
<br>
I'm studying Suricata and I got this result:<br>
<br>
11/16/2011-15:00:00.198278 [**] [1:9000005:0] HEX offset 503 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:00:00.198278 [**] [1:9000004:0] HEX offset 510 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:00:09.374228 [**] [1:9000005:0] HEX offset 503 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:00:09.374228 [**] [1:9000004:0] HEX offset 510 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:00:09.374228 [**] [1:9000001:0] HEX no offset [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:31.769957 [**] [1:9000005:0] HEX offset 503 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:38.380502 [**] [1:9000005:0] HEX offset 503 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:38.380502 [**] [1:9000001:0] HEX no offset [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:44.609767 [**] [1:9000005:0] HEX offset 503 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:44.609767 [**] [1:9000004:0] HEX offset 510 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:44.609767 [**] [1:9000002:0] HEX offset 514 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:48.726883 [**] [1:9000005:0] HEX offset 503 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:48.726883 [**] [1:9000004:0] HEX offset 510 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:48.726883 [**] [1:9000002:0] HEX offset 514 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:48.726883 [**] [1:9000001:0] HEX no offset [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
<br>
against this rules set:<br>
<br>
alert tcp any any <> any 23 (msg:"HEX no offset "; content: "|F8 F8 F8<br>
F8 40 C3 81 89 A7 81|"; sid:9000001;)<br>
alert tcp any any <> any 23 (msg:"HEX offset 514"; content: "|F8 F8 F8<br>
F8 40 C3 81 89 A7 81|"; offset:514; sid:9000002;)<br>
alert tcp any any <> any 23 (msg:"HEX offset 516"; content: "|F8 F8 F8<br>
F8 40 C3 81 89 A7 81|"; offset:516; sid:9000003;)<br>
alert tcp any any <> any 23 (msg:"HEX offset 510"; content: "|F8 F8 F8<br>
F8 40 C3 81 89 A7 81|"; offset:510; sid:9000004;)<br>
alert tcp any any <> any 23 (msg:"HEX offset 503"; content: "|F8 F8 F8<br>
F8 40 C3 81 89 A7 81|"; offset:503; sid:9000005;)<br>
<br>
My doubts are:<br>
<br>
1) Why I'm getting alerts for sid's 9000004,5 for the same packet if the<br>
offset is shifted?<br>
<br>
11/16/2011-15:01:48.726883 [**] [1:9000005:0] HEX offset 503 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:48.726883 [**] [1:9000004:0] HEX offset 510 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:48.726883 [**] [1:9000002:0] HEX offset 514 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:48.726883 [**] [1:9000001:0] HEX no offset [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
<br>
2) Why I'm not getting alerts for sid 9000001 if I got for the others?<br>
<br>
11/16/2011-15:01:44.609767 [**] [1:9000005:0] HEX offset 503 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:44.609767 [**] [1:9000004:0] HEX offset 510 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:44.609767 [**] [1:9000002:0] HEX offset 514 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
<br>
The expected result is only this:<br>
11/16/2011-15:00:09.374228 [**] [1:9000004:0] HEX offset 510 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:00:09.374228 [**] [1:9000001:0] HEX no offset [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:38.380502 [**] [1:9000005:0] HEX offset 503 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:38.380502 [**] [1:9000001:0] HEX no offset [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:48.726883 [**] [1:9000002:0] HEX offset 514 [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
11/16/2011-15:01:48.726883 [**] [1:9000001:0] HEX no offset [**]<br>
[Classification: (null)] [Priority: 3] {TCP} <a href="http://10.31.15.32:23" target="_blank">10.31.15.32:23</a> -><br>
<a href="http://10.85.185.2:43569" target="_blank">10.85.185.2:43569</a><br>
<br>
I don't understand why the others occurs.<br>
Any enlightenment will be welcome.<br>
<br>
Best regards!<br>
<br>
José Paulo<br>
<br>
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</blockquote></div><br><br>Hi,<br>A couple of questions:<br>1) 11/16/2011- is that really the time in the current packets?<br>2) Can you share a pcap , if that is ok?<br><br>Thank you<br><br><br clear="all"><br>-- <br><div>
Regards,</div>
<div>Peter Manev</div>