alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Zeus/Reveton checkin to /images.rar"; flow:established,to_server; http.uri; content:"/images.rar"; fast_pattern; startswith; http.user_agent; content:"Internet Explorer"; startswith; http.host; pcre:"/^(?:\d+\.){3}\d+$/m"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,2697e2b81ba1c90fcd32e24715fcf40a; classtype:command-and-control; sid:2014135; rev:6; metadata:created_at 2012_01_19, former_category MALWARE, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_04;)