You could use the distance or within keywords to force the
content:"Bundle" to follow the content:"User-Agent\: " without using a
pcre. The following might be a good example of a rule:
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS
(msg:"BLEEDING-EDGE MALWARE Shop at Home Select Spyware Activity";
flow:established,to_server; content:"User-Agent\: "; nocase;
content:"Bundle"; nocase; within:30; classtype: policy-violation; sid:
2001702; rev:8;)
Perhaps?
Colin
On 7/4/05, Matt Jonkman <matt@infotex.com> wrote:
I'm adjusting that one and the Grand Street Interactive sigs. I had
split them up to avoid false positives, but this is causing more on
those 2 sigs.
I'm hesitant to pcre these as there are a lot of them. But if I can't
tune them I'll do that.
I'm putting this sig back together. The user-agent we're looking for is
just that, not tacked onto the end of another string. Let me know if
that does better.
Thanks
Matt
Michael Scheidell wrote:
Seems if you have sun java engine on your windows XP engine and attempt
to update it, you trigger the 2001702 signature:
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:
"BLEEDING-EDGE MALWARE Shop at Home Select Spyware Activity"; flow:
established,to_server; content:"User-Agent\: "; nocase;
content:"Bundle"; nocase; classtype: policy-violation; sid: 2001702;
rev:6;)
Should we not use some type of offset or use pcre to make sure 'Bundle'
comes after User-Agent?
Maybe this should be looked at for all of the 'user-agent' strings?
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:
"BLEEDING-EDGE MALWARE Shop at Home Select Spyware Activity"; flow:
established,to_server; pcre:"/User-Agent\:.*Bundle/i"; classtype:
policy-violation; sid: 2001702; rev:7;)
000 : 47 45 54 20 2F 77 65 62 61 70 70 73 2F 64 6F 77 GET /webapps/dow
010 : 6E 6C 6F 61 64 2F 41 75 74 6F 44 4C 3F 42 75 6E nload/AutoDL?Bun
020 : 64 6C 65 49 64 3D 39 39 39 33 20 48 54 54 50 2F dleId=9993 HTTP/
030 : 31 2E 31 0D 0A 41 63 63 65 70 74 3A 20 2A 2F 2A 1.1..Accept: */*
040 : 0D 0A 41 63 63 65 70 74 2D 45 6E 63 6F 64 69 6E ..Accept-Encodin
050 : 67 3A 20 69 64 65 6E 74 69 74 79 0D 0A 52 61 6E g: identity..Ran
060 : 67 65 3A 20 62 79 74 65 73 3D 30 2D 34 38 37 31 ge: bytes=0-4871
070 : 0D 0A 55 73 65 72 2D 41 67 65 6E 74 3A 20 4D 69 ..User-Agent: Mi
080 : 63 72 6F 73 6F 66 74 20 42 49 54 53 2F 36 2E 36 crosoft BITS/6.6
090 : 0D 0A 48 6F 73 74 3A 20 6A 64 6C 2E 73 75 6E 2E ..Host: jdl.sun.
0a0 : 63 6F 6D 0D 0A 43 6F 6E 6E 65 63 74 69 6F 6E 3A com..Connection:
0b0 : 20 4B 65 65 70 2D 41 6C 69 76 65 0D 0A 0D 0A Keep-Alive....
--
--------------------------------------------
Matthew Jonkman, CISSP
Senior Security Engineer
Infotex
765-429-0398 Direct Anytime
765-448-6847 Office
866-679-5177 24x7 NOC
my.infotex.com
www.offsitefilter.com
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