alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE PowerShell Script Downloading Emotet DLL"; flow:from_server,established; http.stat_code; content:"200"; http.content_type; content:"image/png"; bsize:9; http.response_body; content:"|24|path"; startswith; content:".dll"; distance:0; within:200; pcre:"/\x24url[0-9]{1}\s=\s'(http|https):\/\/[^']*\x27\x3b/i"; content:"((Get-Item |24|path).Length -ge 30000)"; nocase; fast_pattern; reference:md5,c3cb504f97c7c7df9c25b0957dd60d9f; classtype:trojan-activity; sid:2035000; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_10, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_01_28;)