alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sakula/Mivast C2 Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".asp?cstring="; fast_pattern; content:"&tom="; content:"&id="; distance:0; http.request_body; content:"|00 00 00 00|"; depth:4; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:md5,5acc539355258122f8cdc7f5c13368e1; classtype:command-and-control; sid:2020378; rev:4; metadata:created_at 2015_02_06, signature_severity Major, updated_at 2020_09_29;)