alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Packed Executable Download"; flow:established,to_client; content:"|0d 0a 0d 0a|MZ"; isdataat:100,relative; content:"This program "; distance:0; content:"PE|00 00|"; distance:0; content:!"data"; within:400; content:!"text"; within:400; content:!"rsrc"; within:400; classtype:misc-activity; sid:2014819; rev:5; metadata:created_at 2012_05_30, performance_impact Moderate, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_08;)