alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zbot downloader Installing Zeus"; flow:established,to_server; http.uri; content:".exe"; fast_pattern; http.accept; bsize:3; content:"*/*"; http.user_agent; bsize:51; content:"Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT 6.0|3b 29|"; http.header; content:"Cache-Control|3a 20|no-cache|0d 0a|"; http.header_names; content:"|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|"; startswith; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|"; endswith; classtype:trojan-activity; sid:2018421; rev:7; metadata:created_at 2014_04_25, performance_impact Significant, signature_severity Major, updated_at 2024_04_08;)