alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Emotet.C Variant Checkin"; flow:to_server,established; http.method; content:"POST"; http.uri; content:"/download.php?listfiles="; http.content_len; byte_test:0,=,0,0,string,dec; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Referer|0d 0a|"; content:!"|0d 0a|Accept"; reference:md5,cd74438c04b09baa5c32ad0e5a0306e7; classtype:command-and-control; sid:2020157; rev:4; metadata:created_at 2015_01_08, malware_family Win32_Emotet_C, signature_severity Major, updated_at 2020_11_17;)