Snort mailing list archives
Re: Caphaw sigs
From: Joel Esler <jesler () sourcefire com>
Date: Sat, 21 Sep 2013 21:57:01 -0400
Thanks! We'll get these tested. -- Joel Esler Sent from my iPad
On Sep 20, 2013, at 7:09 PM, Y M <snort () outlook com> wrote: Second paragraph under "Use of DGA" from the reference: alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Caphaw outbound connection attempt"; flow:to_server,established; content:"/ping.html?r="; http_uri; fast_pattern:only; content:!"/utils/"; metadata: impact_flag red; policy balanced-ips drop, policy security-ips drop, ruleset community, service http; reference:url,research.zscaler.com/2013/09/a-new-wave-of-win32caphaw-attacks.html; classtype:trojan-activity; sid:100044; rev:1;) Another rule can be devised from the reference which is similar to sid:27538, with a slimodification to the first content match and an additional content match for "localhost": alert tcp $EXTERNAL_NET 443 -> $HOME_NET any (msg:"MALWARE-OTHER self-signed SSL certificate with default MyCompany Ltd organization name"; flow:established,to_client; ssl_state:server_hello; content:"localhost"; content:"|55 04 0A 13 0E|MyCompany Ltd"; fast_pattern:only; metadata:impact_flag red, ruleset community, service ssl; reference:url,research.zscaler.com/2013/09/a-new-wave-of-win32caphaw-attacks.html; reference:url,en.wikipedia.org/wiki/Self-signed_certificate; reference:url,security.ncsa.illinois.edu/research/grid-howtos/usefulopenssl.html; classtype:policy-violation; sid:100045; rev:1;) ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/20/13. http://pubads.g.doubleclick.net/gampad/clk?id=58041151&iu=/4140/ostg.clktrk _______________________________________________ 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!
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Current thread:
- Caphaw sigs Y M (Sep 20)
- Re: Caphaw sigs Joel Esler (Sep 21)