alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Unruy Downloader Checkin"; flow:established,to_server; http.uri; content:".php?U="; content:"@"; pcre:"/\.php\?U=\d+@\d+@\d+@\d+@\d+@[a-f0-9]+$/"; reference:url,ddanchev.blogspot.com/2010/03/copyright-lawsuit-filed-against-you.html; reference:url,isc.sans.org/diary.html?storyid=8497; reference:url,threatinfo.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=TROJ_AGENT.STM&VSect=T; classtype:command-and-control; sid:2010975; rev:6; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_20;)