alert http $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Upatre IE Redirector Receiving Payload Jan 9 2015"; flow:established,to_client; http.content_type; bsize:6; content:"$ctype"; fast_pattern; http.header; content:"Content-Disposition|3a 20|attachment|3b 20|"; content:".zip|20 3b 0d 0a|"; distance:0; file.data; content:"PK|03 04|"; within:4; classtype:trojan-activity; sid:2020160; rev:7; metadata:created_at 2015_01_09, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_05;)