alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Periscope Framework Agent Related Activity"; flow:established,to_server; http.uri; content:"/api/status"; startswith; http.user_agent; content:"go-test"; bsize:7; fast_pattern; reference:url,github.com/malcomvetter/Periscope; classtype:trojan-activity; sid:2048117; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_09_19, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_19, reviewed_at 2023_09_19; target:src_ip;)