alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Malware Related msndown"; flow:established,to_server; http.user_agent; content:"msndown"; depth:7; endswith; reference:url,www.sunbeltsecurity.com/partnerresources/cwsandbox/md5.aspx?id=17fdf0cb5970b71b81b1a5406e017ac1; classtype:trojan-activity; sid:2012221; rev:5; metadata:created_at 2011_01_22, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_19;)