Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED BunnyLoader Data Exfiltration Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/Bunny/Uploader.php"; http.request_body; content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|file|22 3b 20|filename|3d 22|BunnyLogs_"; fast_pattern; pcre:"/^[A-Z0-9]{4,8}/R"; content:".zip|22 0d 0a|Content-Type|3a 20|application/octet-stream|0d 0a 0d 0a|PK"; within:52; content:"Information.txt"; within:200; reference:url,www.zscaler.com/blogs/security-research/bunnyloader-newest-malware-service; reference:md5,dbf727e1effc3631ae634d95a0d88bf3; classtype:trojan-activity; sid:2048405; 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;)