alert http $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET MALWARE W32/Dridex Binary Download 6th Jan 2016"; flow:established,to_client; flowbits:isset,et.dridexdoc; http.response_header; header_lowercase; content:"content-disposition|3a 20|attachment|3b 20|filename|3d|"; startswith; content:".exe"; fast_pattern; file.data; content:"MZ"; within:2; content:"This program"; within:100; classtype:trojan-activity; sid:2022340; rev:7; metadata:created_at 2016_01_07, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_27;)