alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Tobfy.S"; flow:established,from_client; http.uri; content:"/upload/img.jpg"; fast_pattern; pcre:"/^\/[a-z0-9]{3,}\/upload\/img\.jpg$/"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,ac03c5980e2019992b876798df2df9ab; classtype:trojan-activity; sid:2017004; rev:6; metadata:created_at 2013_06_12, malware_family Win32_Tobfy_S, signature_severity Major, updated_at 2020_09_18;)