alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/PurpleFox Related Activity (GET)"; flow:established,to_server; http.request_line; content:"GET /i.php?i="; fast_pattern; startswith; http.user_agent; content:"Windows Installer"; bsize:17; http.header_names; content:!"Referer"; content:"|0d 0a|Connection|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; reference:md5,7f757563585debbbccc3e34664de04fe; reference:md5,c793425d192af8f89b1b8c7e1ea6f792; reference:url,twitter.com/Max_Mal_/status/1498351091066589184; classtype:trojan-activity; sid:2035313; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_02_28, deployment Perimeter, malware_family PurpleFox, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_28;)