ET MALWARE Possible Win32/Travnet.A Internet Connection Check (microsoft.com)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Possible Win32/Travnet.A Internet Connection Check (microsoft.com)";
    flow:to_server,established;
    http.method;
    content:"GET";
    http.uri;
    content:"/info/privacy_security.htm";
    http.header_names;
    content:!"Referer|0d 0a|";
    http.host;
    content:"microsoft.com"; endswith;
    reference:md5,d04a7f30c83290b86cac8d762dcc2df5;
    reference:md5,cb9cc50b18a7c91cf4a34c624b90db5d;
    reference:url,www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=TrojanSpy%3AWin32%2FTravnet.A;
    reference:url,blogs.mcafee.com/mcafee-labs/travnet-botnet-steals-huge-amount-of-sensitive-data;
    classtype:trojan-activity;
    sid:2016969; rev:6;
    metadata:created_at 2013_06_05, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_24;
)