Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Golang/Kaos/YamaBot CnC Activity"; flow:established,to_server; http.user_agent; content:"TW96aWxsYS81LjAgKFdpbmRvd3MgTlQgMTAuMDsgV2luNjQ7IHg2NCkgQXBwbGVXZWJLaXQvNTM3LjM2IChLSFRNTCwgbGlrZSBHZWNrbykgQ2hyb21lLzYwLjAuMzExMi4xMTMgU2FmYXJpLzUzNy4zNg=="; reference:url,blogs.jpcert.or.jp/ja/2022/06/yamabot.html; reference:md5,612538328e0c4f3e445fb58ef811336a; reference:md5,cf1a90e458966bcba8286d46d6ab052c; classtype:command-and-control; sid:2037241; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_03_18, deployment Perimeter, malware_family Lazarus, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_07_01;)