alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Voltron/Spectre Stealer Download Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/v4/down/"; startswith; fast_pattern; http.host; content:".cc"; endswith; http.header_names; content:!"Referer"; classtype:trojan-activity; sid:2034039; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_09_17, deployment Perimeter, malware_family Win32_Voltron_Spectre, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_17;)