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.response_header; header_lowercase; content:"content-disposition|3a 20|attachment|3b 20|"; content:".zip|20 3b|"; endswith; file.data; content:"PK|03 04|"; within:4; classtype:trojan-activity; sid:2020160; rev:8; metadata:created_at 2015_01_09, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_27;)