DNS/HijackingCampaignについて、ここに記述してください。

https://www.us-cert.gov/ncas/current-activity/2019/01/10/DNS-Infrastructure-Hijacking-Campaign

    Implement multifactor authentication on domain registrar accounts, or on other systems used to modify DNS records.
    Verify that DNS infrastructure (second-level domains, sub-domains, and related resource records) points to 
   the correct Internet Protocol addresses or hostnames.
    Search for encryption certificates related to domains and revoke any fraudulently requested certificates.

https://www.fireeye.com/blog/threat-research/2019/01/global-dns-hijacking-campaign-dns-record-manipulation-at-scale.html

Global DNS Hijacking Campaign: DNS Record Manipulation at Scale January 09, 2019 | by Muks Hirani, Sarah Jones, Ben Read

NSを書き換える方法は説明されていない。

-- ToshinoriMaeno 2019-01-10 23:56:18