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Rev: 1 • Jan 5, 2023, 12:00 PMET MALWARE Golang/Sandcat Plugin Activity (POST)
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Golang/Sandcat Plugin Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/beacon"; bsize:7; http.user_agent; content:"Go-http-client/"; startswith; http.accept_enc; content:"gzip"; bsize:4; http.request_body; content:"eyJ"; startswith; fast_pattern; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/"; http.header_names; content:!"Referer"; reference:url,github.com/mitre/sandcat; classtype:trojan-activity; sid:2043217; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_01_05, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_05;)
Jan 5, 2023, 12:00 PM
Jan 5, 2023, 12:00 PM
Sep 21, 2024, 3:00 AM
Aug 26, 2025, 9:34 PM
rules/emerging-malware.rules