alert http $HOME_NET any -> $HOME_NET any (msg:"ET WEB_SERVER Suspected SUPERNOVA Webshell Command (Internal)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/Orion/logoimagehandler.ashx"; bsize:28; fast_pattern; http.user_agent; content:"python-requests/"; startswith; nocase; reference:url,www.secureworks.com/blog/supernova-web-shell-deployment-linked-to-spiral-threat-group; classtype:attempted-admin; sid:2031880; rev:1; metadata:attack_target Server, created_at 2021_03_09, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_09;)