alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PoshC2 - Observed Default URI Structure M11"; flow:established,to_server; http.uri; content:"/classroom/sharewidget/widget_stable.html"; startswith; fast_pattern; content:"/?"; within:38; isdataat:!16,relative; reference:url,github.com/nettitude/PoshC2/; reference:url,poshc2.readthedocs.io/en/latest/; classtype:command-and-control; sid:2036520; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_05_06, deployment Perimeter, deployment SSLDecrypt, malware_family PoshC2, confidence Medium, signature_severity Major, tag c2, updated_at 2022_05_06, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)