Rule History

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Powershell ScheduledTasks cmdlet Unregister-ScheduledTask command in HTTP Body Response"; flow:established,to_client; http.stat_code; content:"200"; http.response_body; content:"unregister-scheduledtask"; fast_pattern; nocase; pcre:"/(?:\x2dtaskname|\x2dtaskpath)?/i"; reference:url,learn.microsoft.com/en-us/powershell/module/scheduledtasks/?view=windowsserver2025-ps; classtype:bad-unknown; sid:2064767; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, tls_state plaintext, created_at 2025_09_17, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_17, mitre_tactic_id TA0003, mitre_tactic_name Persistence, mitre_technique_id T1547, mitre_technique_name Boot_Or_Logon_Autostart_Execution; target:dest_ip;)