Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED BunnyLoader CnC Checkin - Echoer"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/Bunny/Echoer.php?"; startswith; fast_pattern; content:"country="; content:"ip="; content:"host="; pcre:"/^[A-Z0-9]{4,8}/R"; content:"ver="; pcre:"/^\d\.\d/R"; content:"system=Windows"; content:"privs="; content:"av="; threshold:type limit, track by_src, count 1, seconds 300; reference:url,www.zscaler.com/blogs/security-research/bunnyloader-newest-malware-service; reference:md5,dbf727e1effc3631ae634d95a0d88bf3; classtype:trojan-activity; sid:2048401; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, created_at 2023_10_04, deployment Perimeter, former_category MALWARE, malware_family BunnyLoader, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_04_17, reviewed_at 2025_04_17; target:src_ip;)