alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Clod/Sereki Communication with C&C"; flow:established,to_server; content:".php?id="; http_uri; nocase; content:"&cnt="; http_uri; nocase; pcre:"/\.php\?id=\d+_[0-9a-f]{8}-[0-9a-f]+-[0-9a-f]{8}&cnt=/U"; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Backdoor%3aWin32%2fSereki.A; reference:md5,bbb6ac2181dbbe15efd13c294cb991fa; reference:md5,3c39bfc78fcf3fe805c7472296bf6319; classtype:trojan-activity; sid:2010289; rev:6; metadata:created_at 2010_07_30, signature_severity Unknown, updated_at 2019_07_26;)