alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Single Character jpg Requested via PowerShell"; flow:established,to_server; urilen:6; http.method; content:"GET"; http.uri; content:"|2e|jpg"; endswith; pcre:"/^\x2f[a-zA-Z0-9]{1}\x2ejpg$/"; http.user_agent; content:"WindowsPowerShell"; fast_pattern; reference:md5,bf3f46460851ba21241123f81477e567; classtype:command-and-control; sid:2056739; rev:1; metadata:attack_target Client_Endpoint, tls_state plaintext, created_at 2024_10_21, deployment Perimeter, confidence Medium, signature_severity Informational, updated_at 2024_10_21;)