alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Pushdo Checkin"; flow:established,to_server; content:"GET"; nocase; http_method; content:"m="; http_uri; content:"&a="; http_uri; content:"&os="; http_uri; pcre:"/&os=[a-f0-9]{50}/U"; classtype:command-and-control; sid:2008493; rev:6; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2019_07_26;)