alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible DEEP PANDA C2 Activity"; flow:established,to_server; http.user_agent; content:"Mozilla/4.0+(compatible|3b|+MSIE+8.0|3b|+Windows+NT+5.1|3b|+SV1)"; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; content:!"Content-Type|0d 0a|"; content:!"Accept"; http.request_body; content:"|00 00 00 00 00|"; classtype:command-and-control; sid:2020373; rev:6; metadata:created_at 2015_02_06, confidence Medium, signature_severity Major, updated_at 2020_05_15;)