alert http $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET SHELLCODE Common 0c0c0c0c Heap Spray String"; flow:established,to_client; content:"0c0c0c0c"; nocase; fast_pattern:only; reference:url,www.darkreading.com/security/vulnerabilities/221901428/index.html; classtype:shellcode-detect; sid:2012256; rev:2; metadata:created_at 2011_02_03, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)