alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DustySky Payload Link Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?id="; fast_pattern; content:"&token1="; distance:0; content:"&token2="; distance:0; content:"&C="; distance:0; pcre:"/\/[A-Za-z]+\.php\?((?:id|token1|token2|C)=[A-Za-z0-9\/=+%]*={0,2}&?){4}$/"; http.header_names; content:!"Referer|0d 0a|"; reference:url,www.clearskysec.com/wp-content/uploads/2016/01/Operation%20DustySky_TLP_WHITE.pdf; classtype:trojan-activity; sid:2022343; rev:3; metadata:created_at 2016_01_08, confidence High, signature_severity Major, updated_at 2020_06_17;)