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Phisihing is the term used to describe websites / domains that are based on the original website.
This is often used by email spammers or Trojans, who try to redirect the end customer to a deceptively real, simulated website, especially in online banking, in order to get the TAN numbers of the banking customers. I.e. the online banking customer thinks he is making a transfer to XYZ, but in reality he is convincing the spammer / Trojan of his money.
What is noticeable about phishing websites / domains is that they usually consist of the original term e.g. "DeutscheBank" and a not common TLD (e.g.: www.deutsche-bank.de.vu - .vu stands here for the island state Vanatu in the Pacific) or an addition à la "www.deutsche-bank-online.de". At first glance, all domains look correct, but you might wonder why Deutsche Bank should redirect a customer to another domain than their main domain.
The easiest way is to always move the mouse pointer over the link before clicking on a link in an email. Your e-mail program will then show you where the link points to - if this address does not match the address displayed in the e-mail, then DO NOT click on it! Example:
Phishing: www.bank.com CORRECT: www.bank.com (pay attention here in the browser to what the browser shows you at the bottom left!).
Monitoring! I.e. observe which domains are registered with your company name and whether they have been registered by you or not (in large organizations, the whois entry is often different - in particular, the whois entry can simply be faked, but the name servers should be the same as for your main domain).
There are several companies worldwide that look for such domains for you and inform you fully automatically as soon as a new, suspicious domain appears. Simply enter "Domain Monitoring" or "Brand Monitoring" in Google.
Such a service some companies let themselves pay princely - if you look around something, you will also find inexpensive providers.