alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Asterope Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/?ver="; content:"&id="; distance:0; content:"&os="; distance:0; content:"&res="; distance:0; http.header; content:"Accept-Asterope|3a|"; fast_pattern; reference:md5,19190ef53877979191f6889c6a795f31; classtype:command-and-control; sid:2018750; rev:5; metadata:created_at 2014_06_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_24;)