alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Pushdo Checkin"; flow:established,to_server; http.method; content:"GET"; nocase; http.uri; content:"m="; content:"&a="; content:"&os="; fast_pattern; pcre:"/&os=[a-f0-9]{50}/"; classtype:command-and-control; sid:2008493; rev:7; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2024_03_16;)