alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/H0lyGh0st Ransomware CnC Activity (GET Public Key)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/access.php?order=GetPubkey"; startswith; fast_pattern; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.user_agent; bsize:18; content:"Go|2d|http|2d|client|2f|1|2e|1"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,microsoft.com/security/blog/2022/07/14/north-korean-threat-actor-targets-small-and-midsize-businesses-with-h0lygh0st-ransomware; classtype:trojan-activity; sid:2037766; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_07_14, deployment Perimeter, deprecation_reason Age, malware_family Win32_H0lyGh0st, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_02, reviewed_at 2024_12_02;)