ET MALWARE GET to Google with specific HTTP lib likely Cycbot/Bifrose/Kryptic checking Internet connection

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE GET to Google with specific HTTP lib likely Cycbot/Bifrose/Kryptic checking Internet connection";
    flow:established,to_server;
    urilen:1;
    http.method;
    content:"GET";
    http.host;
    content:"www.google.com";
    http.connection;
    content:"close"; nocase;
    http.header_names;
    content:"|0d 0a|Connection|0d 0a|Host|0d 0a|Pragma|0d 0a 0d 0a|"; endswith; fast_pattern;
    classtype:command-and-control;
    sid:2012645; rev:7;
    metadata:created_at 2011_04_06, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_15;
)