alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Chinese Bootkit Checkin"; flow:established,to_server; content:".aspx"; http_uri; content:"a=Windows"; nocase; http_uri; content:"&b="; http_uri; content:"&c="; http_uri; content:"&f="; http_uri; content:"&k="; pcre:"/c=[a-z0-9]{2}-[a-z0-9]{2}-[a-z0-9]{2}-[a-z0-9]{2}-[a-z0-9]{2}-[a-z0-9]{2}/iU"; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; classtype:command-and-control; sid:2012631; rev:6; metadata:created_at 2011_04_05, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_20;)