alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER BlackSquid JSP Webshell Outbound"; flow:established,from_server; http.stat_code; content:"200"; file.data; content:"<|25 25|java.io.InputStream|20|"; depth:25; content:"Runtime.getRunetime|28 29|.exec|28|request"; within:50; content:".getInputStream|28 29 3b|int|20|"; distance:0; fast_pattern; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/blacksquid-slithers-into-servers-and-drives-with-8-notorious-exploits-to-drop-xmrig-miner/; classtype:attempted-admin; sid:2027433; rev:3; metadata:attack_target Web_Server, created_at 2019_06_04, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2020_11_18;)