Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Nim Based Downloader Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/version"; endswith; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; bsize:57; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Save-Data|0d 0a|Host|0d 0a 0d 0a|"; endswith; http.header; content:"Save-Data|3a 20|"; fast_pattern; reference:url,twitter.com/h2jazi/status/1531312666987347968; reference:md5,bf80b998a00cbb3705e23c3314498d61; classtype:trojan-activity; sid:2036733; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_05_31, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_31;)