alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious explorer.exe in URI"; flow:established,to_server; urilen:<100; http.method; content:"GET"; http.uri; content:"/explorer.exe"; nocase; endswith; fast_pattern; reference:md5,de1bc32ad135b14ad3a5cf72566a63ff; classtype:bad-unknown; sid:2016700; rev:16; metadata:created_at 2013_04_02, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17;)