alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE 000Stealer CnC Checkin"; flow:established,to_server; http.request_line; content:"POST|20|/ping|20|"; startswith; fast_pattern; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.content_len; byte_test:0,=,36,0,string,dec; http.request_body; content:"key="; startswith; pcre:"/^key=[A-F0-9]{32}$/"; reference:md5,3f9c1455992239f4efe31f0e56773433; reference:url,twitter.com/3xp0rtblog/status/1509978637189419008; classtype:trojan-activity; sid:2036306; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_22, deployment Perimeter, malware_family 000Stealer, performance_impact Low, confidence High, signature_severity Major, updated_at 2022_04_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)