alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Arid Viper APT Checkin 1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?name="; fast_pattern; content:"&user="; pcre:"/&user=\d+$/"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:"|0d 0a|remote_user|0d 0a|"; reference:url,trendmicro.com/cloud-content/us/pdfs/security-intelligence/white-papers/wp-operation-arid-viper.pdf; classtype:targeted-activity; sid:2020434; rev:5; metadata:created_at 2015_02_17, signature_severity Major, updated_at 2024_04_21;)