alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bitcoin variant Checkin"; flow:to_server,established; http.uri; content:"/register_slave.php"; fast_pattern; http.header_names; content:!"|0d 0a|Referer"; nocase; reference:url,blog.avast.com/2013/08/01/malicious-bitcoin-miners-target-czech-republic/; classtype:coin-mining; sid:2017369; rev:4; metadata:created_at 2013_08_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_20;)