我正在浏览社区规则。Snort 网页，并注意到以下两条规则：
Rule @ line 2643: alert udp $HOME_NET any -> any 53 (msg:"BLACKLIST DNS request for known malware domain documents.myPicture.info"; flow:to_server; byte_test:1,!&,0xF8,2; content:"|09|documents|09|myPicture|04|info|00|"; fast_pattern:only; metadata:impact_flag red, policy balanced-ips drop, policy security-ips drop, ruleset community, service dns; reference:url,fireeye.com/blog/technical/2013/08/survival-of-the-fittest-new-york-times-attackers-evolve-quickly.html; classtype:trojan-activity; sid:27625; rev:2;)
Rule @ line 2644: alert udp $HOME_NET any -> any 53 (msg:"BLACKLIST DNS request for known malware domain ftp.documents.myPicture.info"; flow:to_server; byte_test:1,!&,0xF8,2; content:"|03|ftp|09|documents|09|myPicture|04|info|00|"; fast_pattern:only; metadata:impact_flag red, policy balanced-ips drop, policy security-ips drop, ruleset community, service dns; reference:url,fireeye.com/blog/technical/2013/08/survival-of-the-fittest-new-york-times-attackers-evolve-quickly.html; classtype:trojan-activity; sid:27626; rev:2;)
content第一条规则中的选项 ( )是否不会|09|documents|09|myPicture|04|info|00|使第二条规则变得多余？也就是说，如果第二条规则触发，则第一条规则始终会触发，因为第一条规则的content选项是第二条content规则选项的子字符串 ( |03|ftp|09|documents|09|myPicture|04|info|00|)
答案1
Snort 邮件列表确认这些规则是多余的这次交流。