alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zbot CnC GET /lost.dat"; flow:established,to_server; http.method; content:"GET"; nocase; http.uri; content:"/lost.dat"; reference:md5,43d8afa89bd6bf06973af62220d6c158; classtype:command-and-control; sid:2014980; rev:4; metadata:created_at 2012_06_28, signature_severity Major, updated_at 2020_04_21;)