alert ftp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Miniduke variant FTP upload"; flow:to_server,established; content:"USER "; pcre:"/^(?:(?:menelao|ho[mr]u)s|adair|johan|kweku)\r\n/R"; reference:md5,e175be029dd2b78c059278a567b3ada1; reference:url,www.f-secure.com/static/doc/labs_global/Whitepapers/cosmicduke_whitepaper.pdf; classtype:targeted-activity; sid:2023911; rev:4; metadata:created_at 2014_07_03, signature_severity Major, updated_at 2019_07_26;)