alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ursnif Checkin"; flow:established,to_server; http.uri; content:"/?user="; fast_pattern; content:"os="; content:"&os2="; content:"&ver="; content:"&host="; content:!"|2e|"; content:"type="; http.header_names; content:!"Referer|0d 0a|"; classtype:command-and-control; sid:2019678; rev:5; metadata:created_at 2014_11_08, signature_severity Major, updated_at 2020_09_29;)