alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sidecopy APT Related Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!".asp"; content:!".php"; content:!".htm"; http.header_names; content:!"Referer"; content:!"User-Agent"; content:"|0d 0a|Content-Type|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a|"; http.request_body; content:"anvaro=|25 32 30|"; startswith; fast_pattern; reference:url,twitter.com/fmc_nan/status/1634096201577660416; reference:md5,30e8c453d72000d647435d92ffa94616; classtype:trojan-activity; sid:2044645; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_03_16, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_16; target:src_ip;)