Snort mailing list archives
Re: Proposed Sirefef (was Re: Late in the day...bet this could be sig'd)
From: waldo kitty <wkitty42 () windstream net>
Date: Mon, 06 May 2013 17:04:52 -0400
On 5/6/2013 13:37, Joel Esler wrote:
On May 3, 2013, at 8:54 PM, lists () packetmail net <mailto:lists () packetmail net> wrote:alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET CURRENT_EVENTS/VRT_COMMUNITY Potential Sirefef hostile executable served from compromised or malicious WordPress site"; flow:established,from_server; content:"/wp-content/"; http_uri; content:".exe|20|HTTP/1."; fast_pattern:only; pcre:"/\/\d+\.exe$/U"; classtype:trojan-activity; reference:url,blog.avast.com/2013/05/03/regents-of-louisiana-spreading-sirefef-malware <http://blog.avast.com/2013/05/03/regents-of-louisiana-spreading-sirefef-malware>; sid:x; rev:1;)Nathan, Looking at what you are intending here, I think you mean it the other way (HOME_NET -> $EXTERNAL_NET)
ok... now i'm officially confused... the flow in the rule is "from_server"... with that specified, does it really matter if HOME_NET or EXTERNAL_NET come first? then there's the situation of not only detecting this coming into a network from an external server, but also of detecting this going out of a network that runs servers feeding the public on the outside... does the '->' really make any difference? should it instead have been '<-' if the rule writer really wanted HOME_NET to be first? would using '<->' or '<>' (if either is allowed) detect the traffic no matter which way the traffic was going (internal server to external client or external server to internal client) no matter where the server is located?? -- NOTE: No off-list assistance is given without prior approval. Please keep mailing list traffic on the list unless private contact is specifically requested and granted. ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. This 200-page book is written by three acclaimed leaders in the field. The early access version is available now. Download your free book today! http://p.sf.net/sfu/neotech_d2d_may _______________________________________________ Snort-sigs mailing list Snort-sigs () lists sourceforge net https://lists.sourceforge.net/lists/listinfo/snort-sigs http://www.snort.org Please visit http://blog.snort.org for the latest news about Snort!
Current thread:
- Late in the day...bet this could be sig'd James Lay (May 03)
- Proposed Sirefef (was Re: Late in the day...bet this could be sig'd) lists () packetmail net (May 03)
- Re: Proposed Sirefef (was Re: Late in the day...bet thiscould be sig'd) Lay, James (May 06)
- Re: Proposed Sirefef (was Re: Late in the day...bet this could be sig'd) Joel Esler (May 06)
- Re: Proposed Sirefef (was Re: Late in the day...bet this could be sig'd) Joel Esler (May 06)
- Re: Proposed Sirefef (was Re: Late in the day...bet this could be sig'd) waldo kitty (May 06)
- Re: Proposed Sirefef (was Re: Late in the day...bet this could be sig'd) Joel Esler (May 06)
- Re: Proposed Sirefef (was Re: Late in the day...bet this could be sig'd) waldo kitty (May 06)
- Proposed Sirefef (was Re: Late in the day...bet this could be sig'd) lists () packetmail net (May 03)