alert http $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET SHELLCODE Possible UTF-8 %u90 NOP SLED"; flow:established,to_client; content:"%u90%u90"; nocase; reference:url,cansecwest.com/slides07/csw07-nazario.pdf; reference:url,www.sophos.com/security/technical-papers/malware_with_your_mocha.html; reference:url,www.windowsecurity.com/articles/Obfuscated-Shellcode-Part1.html; classtype:shellcode-detect; sid:2012110; rev:3; metadata:created_at 2011_12_28, updated_at 2011_12_28;)

Added 2017-08-07 21:05:11 UTC

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET SHELLCODE Possible UTF-8 %u90 NOP SLED"; flow:established,to_client; content:"%u90%u90"; nocase; fast_pattern:only; reference:url,cansecwest.com/slides07/csw07-nazario.pdf; reference:url,www.sophos.com/security/technical-papers/malware_with_your_mocha.html; reference:url,www.windowsecurity.com/articles/Obfuscated-Shellcode-Part1.html; classtype:shellcode-detect; sid:2012110; rev:2;)

Added 2011-10-12 19:33:29 UTC

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET SHELLCODE Possible UTF-8 %u90 NOP SLED"; flow:established,to_client; content:"%u90%u90"; nocase; fast_pattern:only; classtype:shellcode-detect; reference:url,cansecwest.com/slides07/csw07-nazario.pdf; reference:url,www.sophos.com/security/technical-papers/malware_with_your_mocha.html; reference:url,www.windowsecurity.com/articles/Obfuscated-Shellcode-Part1.html; sid:2012110; rev:2;)

Added 2011-02-04 17:31:59 UTC