Versions (6)
Version DetailsCurrent
Rev: 2 • Dec 21, 2023, 12:00 PMET RETIRED Win32/Koi Stealer CnC Checkin (POST) M1
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Win32/Koi Stealer CnC Checkin (POST) M1"; flow:established,to_server; urilen:65; http.method; content:"GET"; http.uri; content:"/index.php?id="; startswith; fast_pattern; content:"&subid="; distance:36; within:7; pcre:"/^\/index\.php\?id=[a-f0-9]{8}-([a-f0-9]{4}-){3}[a-f0-9]{12}\&subid=[a-zA-Z0-9]{8}$/"; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; bsize:22; reference:md5,ef24aa4c496b5d9803e7e37ae0f8e649; classtype:trojan-activity; sid:2049816; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2023_12_21, deployment Perimeter, former_category MALWARE, malware_family Win32_Koi, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2025_04_17, reviewed_at 2025_04_17; target:src_ip;)
Dec 21, 2023, 12:00 PM
Apr 17, 2025, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-retired.rules