alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kronos Checkin M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/connect.php?a=1"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|accept"; content:!"|0d 0a|content-type|0d 0a|"; classtype:command-and-control; sid:2020077; rev:5; metadata:created_at 2014_12_29, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_21;)