alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor.Win32.Sykipot Checkin"; flow:established,from_client; http.uri; content:"allow_get.asp?name="; fast_pattern; content:"&hostname="; distance:0; http.header_names; content:!"Referer|0d 0a|"; reference:cve,2011-2462; reference:url,blog.9bplus.com/analyzing-cve-2011-2462; reference:url,contagiodump.blogspot.com/2011/12/adobe-zero-day-cve-2011-2462.html; classtype:command-and-control; sid:2014006; rev:4; metadata:created_at 2011_12_09, cve CVE_2011_2462, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_09;)