alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Vinself Backdoor Checkin"; flow:established,to_server; http.method; content:"POST"; nocase; http.uri; pcre:"/^\/[A-Z]{1}[0-9]{1,3}\/[A-X]{1}[0-9]{1,2}[A-Z]{1}[0-9]{1,2}[A-Z]{1}[0-9]{1,2}\/[A-Z]{1}[0-9]{4,5}[A-M]{1}[0-9]{1,2}[A-Z]{1}[0-9]{1,2}\/$/"; http.content_len; bsize:2; content:"90"; http.request_body; content:"GIF89a|50 00 00 00|"; startswith; fast_pattern; reference:url,blog.fireeye.com/research/2010/11/winself-a-new-backdoor-in-town.html; classtype:command-and-control; sid:2012865; rev:12; metadata:created_at 2010_12_22, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_22;)