alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Avaddon Ransomware Style External IP Address Check"; flow:established,to_server; urilen:1; http.method; content:"GET"; http.user_agent; bsize:7; content:"WinInet"; http.host; content:"api.myip.com"; fast_pattern; startswith; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; reference:md5,c9ec0d9ff44f445ce5614cc87398b38d; classtype:trojan-activity; sid:2030253; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_05, deployment Perimeter, deployment SSLDecrypt, malware_family Avaddon, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_10, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)