alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sality Variant Downloader Activity (3)"; flow:established,to_server; http.uri; content:"/?id"; nocase; content:"&rnd="; pcre:"/\/\?id(\d+)?&rnd=\d+$/"; http.header; content:!"Windows NT"; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:md5,438bcb3c4a304b65419674ce8775d8a3; classtype:trojan-activity; sid:2011338; rev:7; metadata:created_at 2010_09_28, performance_impact Significant, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_22;)