alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Maldoc Retrieving Binary"; flow:established,to_client; flowbits:isset,ET.maldoc.trick; http.start; content:"HTTP/1.1 200 OK|0d 0a|Server|3a 20|fasthttp|0d 0a|"; fast_pattern; file.data; content:"MZ"; startswith; reference:md5,e6258c27362df0668295258b69a5a74d; reference:md5,91314d1cdd3bfb38daba9273730ed1a4; classtype:trojan-activity; sid:2034632; rev:3; metadata:attack_target Client_Endpoint, created_at 2021_12_08, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_20;)