alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE WORM_VOBFUS Checkin 1"; flow:established,to_server; urilen:5; http.method; content:"GET"; http.uri; content:"/1/?"; startswith; http.host; content:".ddns"; fast_pattern; content:".eu|0d 0a|"; distance:1; within:5; pcre:"/^\d{5}\x2eddns[a-z0-9]\x2eeu$/"; http.user_agent; content:"MSIE 7.0|3b|"; reference:md5,f127ed76dc5e48f69a1070f314488ce2; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/watch-out-for-worm_vobfus/; classtype:command-and-control; sid:2015968; rev:9; metadata:created_at 2012_11_30, signature_severity Major, updated_at 2020_04_22;)