alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Worm.VBS.ayr CnC command response"; flow:established,from_server; file_data; content:"send|3c 7c 3e|"; within:7; pcre:"/^[A-Z]\x3a\x5f/R"; reference:url,www.fireeye.com/blog/uncategorized/2013/09/now-you-see-me-h-worm-by-houdini.html; classtype:command-and-control; sid:2017523; rev:5; metadata:created_at 2013_09_25, signature_severity Major, updated_at 2019_07_26;)