alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Possible Malicious Gzip PowerShell over HTTP"; flow:established,from_server; file_data; content:"FromBase64String"; content:"H4sIAI"; distance:0; fast_pattern; content:"GzipStream"; nocase; distance:0; classtype:trojan-activity; sid:2024221; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_18, deployment Perimeter, malware_family PowerShell, performance_impact Moderate, confidence Medium, signature_severity Major, tag PowerShell, updated_at 2019_07_26;)