alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Malicious VBS Script Activity"; flow:established,to_server; http.uri; content:"/user/get/"; startswith; fast_pattern; http.user_agent; content:"Microsoft BITS/"; startswith; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.header_names; content:!"Referer"; reference:url,blog.group-ib.com/prometheus-tds; classtype:trojan-activity; sid:2033704; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_08_10, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_10;)