#alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED Nginx Server with no version string - Often Hostile Traffic"; flow:established,from_server; content:"|0d 0a|Server|3a| nginx|0d 0a|"; nocase; threshold:type limit, seconds 60, count 3, track by_src; reference:url,doc.emergingthreats.net/2008064; classtype:bad-unknown; sid:2008064; rev:6; metadata:created_at 2010_07_30, updated_at 2010_07_30;)

Added 2018-09-13 19:39:38 UTC

Added 2018-09-13 17:53:44 UTC

#alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED Nginx Server with no version string - Often Hostile Traffic"; flow:established,from_server; content:"|0d 0a|Server|3a| nginx|0d 0a|"; nocase; threshold:type limit, seconds 60, count 3, track by_src; reference:url,doc.emergingthreats.net/2008064; classtype:bad-unknown; sid:2008064; 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 DELETED Nginx Server with no version string - Often Hostile Traffic"; flow:established,from_server; content:"Server|3a| nginx|0d 0a|"; nocase; http_header; threshold:type limit, seconds 60, count 3, track by_src; reference:url,doc.emergingthreats.net/2008064; classtype:bad-unknown; sid:2008064; rev:5;)

Added 2012-11-28 18:14:34 UTC

#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with no version string - Often Hostile Traffic"; flow:established,from_server; content:"Server|3a| nginx|0d 0a|"; nocase; http_header; threshold:type limit, seconds 60, count 3, track by_src; reference:url,doc.emergingthreats.net/2008064; classtype:bad-unknown; sid:2008064; rev:4;)

Added 2011-10-12 19:24:22 UTC

#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with no version string - Often Hostile Traffic"; flow:established,from_server; content:"Server|3a| nginx|0d 0a|"; nocase; http_header; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; reference:url,doc.emergingthreats.net/2008064; sid:2008064; rev:4;)

Added 2011-09-14 22:37:51 UTC

#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with no version string - Often Hostile Traffic"; flow:established,from_server; content:"Server|3a| nginx|0d 0a|"; nocase; http_header; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; reference:url,doc.emergingthreats.net/2008064; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/POLICY/POLICY_Nginx; sid:2008064; 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 no version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"|0d 0a|Server\: nginx|0d 0a|"; nocase; distance:4; within:300; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; reference:url,doc.emergingthreats.net/2008064; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/POLICY/POLICY_Nginx; sid:2008064; 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 no version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"|0d 0a|Server\: nginx|0d 0a|"; nocase; distance:4; within:300; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; reference:url,doc.emergingthreats.net/2008064; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/POLICY/POLICY_Nginx; sid:2008064; 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 no version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"|0d 0a|Server\: nginx|0d 0a|"; nocase; distance:4; within:300; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; sid:2008064; rev:1;)

Added 2008-04-01 11:35:15 UTC

#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with no version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"|0d 0a|Server\: nginx|0d 0a|"; nocase; distance:4; within:300; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; sid:2008064; rev:1;)

Added 2008-04-01 11:35:15 UTC

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET POLICY Nginx Server with no version string - Often Hostile Traffic"; flow:established,from_server; content:"HTTP/1."; depth:7; content:"|0d 0a|Server\: nginx|0d 0a|"; nocase; distance:4; within:300; threshold:type limit, seconds 60, count 3, track by_src; classtype:bad-unknown; sid:2008064; rev:1;)

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

Often hostile. But not always. Many malware uses of nginx have the version string stripped.

-- MattJonkman - 28 Mar 2008