alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Koobface C&C availability check"; flow:established,to_server; flowbits:set,ET.koobfacecheck; http.method; content:"POST"; nocase; http.uri; content:"/achcheck.php"; nocase; reference:url,us.trendmicro.com/imperia/md/content/us/trendwatch/researchandanalysis/the_20heart_20of_20koobface_final_1_.pdf; classtype:command-and-control; sid:2010151; rev:9; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_24;)