alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Phorpiex Botnet Downloader Activity (GET)"; flow:established,to_server; http.request_line; content:"GET /zeta_ HTTP/1.1"; fast_pattern; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:22; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; reference:md5,ec96bcc50ca8fa91821e820fdfe30915; reference:url,research.checkpoint.com/2021/phorpiex-botnet-is-back-with-a-new-twizt-hijacking-hundreds-of-crypto-transactions/; classtype:trojan-activity; sid:2034778; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_12_20, deployment Perimeter, malware_family Phorpiex, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_20;)