alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET DELETED MSUpdater post-auth checkin"; flow:established,to_server; content:"/search6"; http_uri; fast_pattern; content:"?h1="; http_uri; content:"User-Agent|3a 20|Mozilla/5.0 (compatible|3b 20|Windows NT 5.2)"; http_header; reference:url,research.zscaler.com/2012/01/msupdater-trojan-and-link-to-targeted.html; reference:url,blog.seculert.com/2012/01/msupdater-trojan-and-conference-invite.html; classtype:trojan-activity; sid:2014214; rev:2; metadata:created_at 2012_02_07, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)