alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE FakeAV security_scanner.exe"; flow:established,to_client; http.header; content:"Content-Disposition|3a| "; content:"filename=|22|security_scanner.exe|22|"; fast_pattern; classtype:trojan-activity; sid:2016177; rev:3; metadata:created_at 2013_01_09, signature_severity Major, updated_at 2020_04_22;)