alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING PE EXE Download over raw TCP"; flow:established,to_client; stream_size:client,<,5; dsize:>11; content:"MZ"; startswith; byte_jump:4,58,relative,little; content:"PE|00 00|"; fast_pattern; distance:-64; within:4; reference:url,github.com/corkami/docs/blob/master/PE/PE.md; classtype:misc-activity; sid:2035480; rev:3; metadata:attack_target Client_Endpoint, created_at 2022_03_16, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_17;)