alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan.Win32/Mutopy.A Checkin"; flow:established,to_server; http.uri; content:"/protocol.php?p="; fast_pattern; content:"&d="; pcre:"/^.{44}$/R"; reference:md5,2a0344bac492c65400eb944ac79ac3c3; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Trojan%3AWin32%2FMutopy.A&ThreatID=-2147312217; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/header-spoofing-hides-malware-communication/; classtype:command-and-control; sid:2016963; rev:7; metadata:created_at 2012_04_13, signature_severity Major, updated_at 2024_03_19;)