alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE General Win32 Backdoor Checkin POST"; flow:established,to_server; flowbits:isset,ET.bd1; http.request_body; content:"Admin="; fast_pattern; startswith; content:"&UserName="; content:"&IsProxy="; classtype:command-and-control; sid:2009241; rev:8; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_12;)