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Rev: 3 • Sep 4, 2025, 8:46 AMTOOLS [PTsecurity] Sliver C2 HTTP Key exchange (Base64 modified alphabet)
alert http any any -> any any (msg:"TOOLS [PTsecurity] Sliver C2 HTTP Key exchange (Base64 modified alphabet)"; flow:established, to_server; http.method; content:"POST"; http.uri; pcre:"/\?(?:[a-z_]=[a-z0-9_]{7,14}&[a-z_]{2}=[a-z0-9_]{8,13}|[a-z_]{2}=[a-z0-9_]{8,13}&[a-z_]=[a-z0-9_]{7,14}|[a-z_]=[a-z0-9_]{7,14})$/U"; http.header.raw; content:!"Cookie|3a|"; nocase; content:"Accept-Encoding|3A| gzip|0d 0a|"; nocase; http.request_body; content:"_"; content:"-"; content:"+"; bsize:355; pcre:"/(?:^[a-fh-zA-Z0-9_\-\+]+$)/P"; reference:url, virustotal.com/gui/file/e877e29e45b823fe32c600508dd9e05e399272c98449976b66f44721e54e42e3/detection; reference:url, rules.ptsecurity.com; classtype:attempted-admin; sid:10011011; rev:3;)
Sep 4, 2025, 8:46 AM
Sep 4, 2025, 8:46 AM
Oct 16, 2025, 10:34 AM
Oct 16, 2025, 10:34 AM
rules/ptopen-tools.rules