alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/SiMay RAT Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.request_line; content:"&shareKey=cfae45c9e7cc8a7734b72abe98235dd1 HTTP/1.0"; fast_pattern; endswith; http.host; content:"note.youdao.com"; reference:md5,a641b3b81153936c6a3d3d99fe8d9736; reference:md5,8205ccb910dc783efcd7d480ef1bd7d9; reference:url,www.sentinelone.com/wp-content/uploads/2022/04/SiMay-RAT.pdf; classtype:trojan-activity; sid:2036600; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_05_17, deployment Perimeter, malware_family SiMayRAT, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_17;)