#alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED Nginx Server with modified version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"|0d 0a|Server|3a| nginx/"; nocase; pcre:"/Server\: nginx/[a-zA-Z]/i"; threshold:type limit, seconds 60, count 3, track by_src; reference:url,doc.emergingthreats.net/2008065; classtype:bad-unknown; sid:2008065; rev:6; metadata:created_at 2010_07_30, updated_at 2010_07_30;)

Added 2017-08-07 21:01:16 UTC


#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with modified version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"Server|3a| nginx/"; nocase; http_header; pcre:"/Server\: nginx/[a-zA-Z]/i"; threshold:type limit, seconds 60, count 3, track by_src; reference:url,doc.emergingthreats.net/2008065; classtype:bad-unknown; sid:2008065; rev:4;)

Added 2011-10-12 19:24:23 UTC


#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with modified version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"Server|3a| nginx/"; nocase; http_header; pcre:"/Server\: nginx/[a-zA-Z]/i"; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; reference:url,doc.emergingthreats.net/2008065; sid:2008065; rev:4;)

Added 2011-09-14 22:37:52 UTC


#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with modified version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"Server|3a| nginx/"; nocase; http_header; pcre:"/Server\: nginx/[a-zA-Z]/i"; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; reference:url,doc.emergingthreats.net/2008065; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/POLICY/POLICY_Nginx; sid:2008065; rev:4;)

Added 2011-05-24 18:47:25 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with modified version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"Server|3a| nginx/"; nocase; http_header; pcre:"/Server\: nginx/[a-zA-Z]/i"; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; reference:url,doc.emergingthreats.net/2008065; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/POLICY/POLICY_Nginx; sid:2008065; rev:4;)

Added 2011-02-04 17:27:10 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with modified version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"|0d 0a|Server\: nginx/"; nocase; pcre:"/Server\: nginx/[a-zA-Z]/i"; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; reference:url,doc.emergingthreats.net/2008065; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/POLICY/POLICY_Nginx; sid:2008065; rev:2;)

Added 2009-02-11 19:15:23 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with modified version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"|0d 0a|Server\: nginx/"; nocase; pcre:"/Server\: nginx/[a-zA-Z]/i"; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; reference:url,doc.emergingthreats.net/2008065; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/POLICY/POLICY_Nginx; sid:2008065; rev:2;)

Added 2009-02-11 19:15:23 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with modified version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"|0d 0a|Server\: nginx/"; nocase; pcre:"/Server\: nginx/[a-zA-Z]/i"; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; sid:2008065; rev:1;)

Added 2008-03-28 13:33:34 UTC

Many malware instances of nginx use (rbn, etc) have a modified server string. It should be nginx/0.x.x. This will catch violations of that which may be more likely to be hostile.

-- MattJonkman - 28 Mar 2008


Topic revision: r2 - 2008-03-28 - MattJonkman
 
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