alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sidecopy APT Backdoor Related Activity (POST)"; flow:established,to_server; http.request_line; content:"POST /logs_files HTTP/1.1"; fast_pattern; http.header_names; content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a|Connection|0d 0a 0d 0a|"; bsize:46; reference:md5,bc8e094a4fb6c724e6b32a00df6262f9; reference:url,twitter.com/bofheaded/status/1505928947955302401; classtype:trojan-activity; sid:2035558; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_03_22, deployment Perimeter, deployment SSLDecrypt, malware_family SideCopy, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_22;)