alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE rechnung zip file download"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"rechnung"; fast_pattern; nocase; content:".zip"; nocase; endswith; http.header_names; content:!"Referer|0d 0a|"; classtype:trojan-activity; sid:2020622; rev:6; metadata:created_at 2015_03_05, deprecation_reason Age, signature_severity Major, updated_at 2024_03_26, reviewed_at 2024_03_26;)