alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/AsyncRAT CnC Checkin (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?id="; fast_pattern; content:"&key="; distance:0; pcre:"/^(?:[0-9]{11})/R"; content:"&s="; within:3; pcre:"/^(?:[0-9]{3})$/R"; http.user_agent; content:"WindowsPowerShell/"; http.header_names; bsize:22; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; reference:url,twitter.com/Unit42_Intel/status/1760426508558950518; classtype:trojan-activity; sid:2051076; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_02_23, deployment Perimeter, malware_family AsyncRAT, performance_impact Significant, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03;)