alert http any any -> any any (msg:"ET MALWARE Possible MSIL/Solorigate.G!dha/SUPERNOVA Webshell Access Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/logoimagehandler.ashx"; content:"clazz="; fast_pattern; content:"method="; content:"args="; content:"codes="; http.header_names; content:!"Referer"; reference:url,www.microsoft.com/security/blog/2020/12/18/analyzing-solorigate-the-compromised-dll-file-that-started-a-sophisticated-cyberattack-and-how-microsoft-defender-helps-protect; reference:url,unit42.paloaltonetworks.com/solarstorm-supernova; classtype:trojan-activity; sid:2031436; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Server, created_at 2020_12_21, deployment Perimeter, malware_family Solorigate, confidence Medium, signature_severity Major, updated_at 2020_12_21, reviewed_at 2024_03_05;)