alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT_KIT Possible Sakura Jar Download"; flow:established,to_client; http.content_type; bsize:26; content:"application/x-java-archive"; fast_pattern; http.header; content:"Last-Modified|3a 20|"; pcre:"/^Last-Modified\x3a\x20Mon,\x20(?!(?:0[29]|16|23|30))\d{2} Jul 2001/m"; classtype:exploit-kit; sid:2016721; rev:6; metadata:created_at 2013_04_04, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_05;)