alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DADJOKE/Rail Tycoon Payload Execution"; flow:to_server,established; http.method; content:"GET"; http.uri; content:"/index.html?a=run"; endswith; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; http.host; pcre:"/^(?:\d{1,3}\.){3}\d{1,3}$/"; http.header_names; content:"|0d 0a|Connection|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; reference:md5,4c89d5d8016581060d9781433cfb0bb5; classtype:command-and-control; sid:2028965; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_12, deployment Perimeter, malware_family APT_40, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_21;)