alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SHELLCODE Possible Backslash Unicode Heap Spray Attempt"; flow:established,to_client; content:"|5C|u0"; nocase; content:"|5C|u0"; distance:1; within:4; pcre:"/\x5Cu0[a-d](\x5Cu0|0)[a-d]/\x5Cu0[a-d](\x5Cu0|0)[a-d]/i"; reference:url,www.darkreading.com/security/vulnerabilities/221901428/index.html; classtype:shellcode-detect; sid:2012970; rev:3; metadata:created_at 2011_06_09, performance_impact Significant, confidence Medium, signature_severity Major, updated_at 2024_04_09;)