alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING EXE Download With Content Type Specified As Empty"; flow:established,to_client; http.header; header_lowercase; content:"content-type|3a 20 0d 0a|"; file.data; content:"MZ"; startswith; isdataat:80,relative; content:"This program "; fast_pattern; distance:0; content:"PE|00|"; distance:0; reference:md5,d51218653323e48672023806f6ace26b; classtype:bad-unknown; sid:2014567; rev:8; metadata:created_at 2012_04_16, performance_impact Moderate, confidence Medium, signature_severity Informational, updated_at 2024_05_06;)