alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor.Win32.Popwin Checkin"; flow:established,to_server; http.uri; content:"/soft/xiaomi"; fast_pattern; content:".asp"; distance:0; http.user_agent; content:"API-Guide test program"; startswith; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|accept|0d 0a|"; reference:md5,dd762c69049fbd00c22f70f109baa26e; classtype:command-and-control; sid:2018143; rev:11; metadata:created_at 2014_02_15, signature_severity Major, updated_at 2024_05_02;)