alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Zbot.Variant Fake MSIE 6.0 UA"; flow:established,to_server; flowbits:set,ET.zbot.ua.2106509; http.uri; content:".htm?"; fast_pattern; pcre:"/\/[a-z]\.htm\?[A-Za-z0-9]+$/"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows NT 5.1|3b 20|SV1)"; classtype:trojan-activity; sid:2016509; rev:8; metadata:created_at 2013_02_27, signature_severity Major, updated_at 2024_03_06;)