alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/AlienSpy RAT Checkin"; flow:established,to_server; flowbits:isset,ET.rat.alienspy; content:"|78 70|"; depth:2; content:"|1f 8b 08 00 00 00 00 00 00 00 6d|"; distance:4; within:11; pcre:"/^[\x53\x54]/R"; reference:url,contagiodump.blogspot.com/2014/11/alienspy-java-rat-samples-and-traffic.html?m=1; classtype:command-and-control; sid:2019739; rev:3; metadata:created_at 2014_11_18, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)