alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE EtumBot Registration Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/image/"; startswith; content:".jpg"; endswith; pcre:"/^\x2fimage\x2f[A-Za-z0-9\+_-]+\.jpg$/i"; http.user_agent; bsize:63; content:"Mozilla/5.0 |28|compatible|3b| MSIE 8.0|3b| Windows NT 6.1|3b| Trident/5.0|29|"; fast_pattern; http.referer; content:"http://www.google.com/"; startswith; reference:url,www.arbornetworks.com/asert/2014/06/illuminating-the-etumbot-apt-backdoor/; reference:md5,ca838b98ca0f516858a8a523dcd1338d; classtype:trojan-activity; sid:2018546; rev:8; metadata:created_at 2014_06_09, signature_severity Major, updated_at 2024_03_10;)