alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Storm Variant HTTP Post (U)"; flow:established,to_server; http.request_line; content:"POST /u/ HTTP"; startswith; nocase; http.user_agent; bsize:17; content:"Internet Explorer"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; http.request_body; content:"a="; depth:2; reference:url,cyber.secdev.ca/2009/11/russian-malware-bundle; reference:url,www.blackhat.com/presentations/bh-usa-08/Stewart/BH_US_08_Stewart_Protocols_of_the_Storm.pdf; classtype:trojan-activity; sid:2010442; rev:5; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_06;)