alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ducktail CnC Checkin (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\x2f\w\x2f[a-z0-9]{96}$/"; urilen:99; http.user_agent; content:"WindowsPowerShell/"; fast_pattern; http.header_names; bsize:22; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; reference:url,x.com/suyog41/status/1875174914128310378; reference:md5,19df486249801c08f0efde6a16e135ee; classtype:command-and-control; sid:2058957; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_01_03, deployment Perimeter, confidence High, signature_severity Major, tag c2, tag Ducktail, updated_at 2025_01_03, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)