alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Generic Dropper/Clicker Checkin"; flow:established,to_server; http.method; content:"GET"; nocase; http.uri; content:"/nxdtic.txt"; classtype:command-and-control; sid:2012931; rev:5; metadata:created_at 2011_06_06, confidence Medium, signature_severity Major, updated_at 2020_04_21;)