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Domain hijacking or domain theft (a cybercrime) is the act of changing the registration of a domain name without the permission of its original registrant, or by abuse of privileges on domain hosting and registrar software systems.
This can be devastating to the original domain name holder, not only financially as they may have derived commercial income from a website hosted at the domain or conducted business through that domain's e-mail accounts, but also in terms of readership and/or audience for non-profit or artistic web addresses. Additionally, the hijacker can use the domain name to facilitate illegal activity such as phishing, where a website is replaced by an identical website that records private information such as log-in passwords, spam, or even distribution of malware.
Domain hijacking can be done in several ways, generally by exploiting a vulnerability in the domain name registrar's system, through social engineering, or gaining unauthorized access to the domain owner's email account that is associated with the domain name registration.
A frequent tactic used by domain hijackers is to use acquired personal information about the actual domain owner to impersonate them and persuade the domain registrar to modify the registration information and/or transfer the domain to another registrar, a form of identity theft. Once this has been done, the hijacker has full control of the domain and can use it or sell it to a third party.
Other methods include email vulnerability, vulnerability at the domain-registration level, keyloggers, and phishing sites.
Responses to discovered hijackings vary; sometimes the registration information can be returned to its original state by the current registrar, but this may be more difficult if the domain name was transferred to another registrar, particularly if that registrar resides in another country. If the stolen domain name has been transferred to another registrar, the losing registrar may invoke ICANN’s Registrar Transfer Dispute Resolution Policy to seek the return of the domain.
In some cases the losing registar for the domain name is not able to regain control over the domain, and the domain name owner may need to pursue legal action to obtain the court ordered return of the domain.
Although the legal status of domain hijacking was formerly thought to be unclear, certain U.S. federal courts in particular have begun to accept causes of action seeking the return of stolen domain names. Domain hijacking is analogous with theft, in that the original owner is deprived of the benefits of the domain, but theft traditionally relates to concrete goods such as jewelry and electronics, whereas domain name ownership is stored only in the digital state of the domain name registry, a network of computers. For this reason, court actions seeking the recovery of stolen domain names are most frequently filed in the location of the relevant domain registry. In some cases, victims have pursued recovery of stolen domain names through ICANN's (Uniform Domain Name Dispute Resolution Policy (UDRP), but a number of UDRP panels have ruled that the policy is not appropriate for cases involving domain theft.
Another method of cybercriminals doing "domain hijacking" is from the backend of hosting and registrar companies. Misusing their company systems to prevent the owner from being contacted by interested parties, for example by fraudulently entering whois-data, and even knowingly stopping or cancelling a customers payment for renewal, allowing the "stolen" domain to then be expired and auctioned via a domain-auctioning site. This is considered to be backend computer-misuse, which is within the scope of the U.S. Computer Fraud and Abuse Act and the UK cybercrime legislation.
ICANN imposes a 60-day waiting period between a change in registration information and a transfer to another registrar. This is intended to make domain hijacking more difficult, since a transferred domain is much more difficult to reclaim, and it is more likely that the original registrant will discover the change in that period and alert the registrar. Extensible Provisioning Protocol is used for many TLD registries, and uses an authorization code issued exclusively to the domain registrant as a security measure to prevent unauthorized transfers.
There are certain steps that a domain-name owner can take to reduce the exposure to domain name hijacking. The following suggestions may prevent an unwanted domain transfer:
Change your email password often. Test your password for its security strength. (There are free sites for checking password strength.) Disable POP if your email provider is able to use a different protocol. Tick the setting “always use https” under email options. Frequently check the “unusual activity” flag if provided by your email service. Use a two-step (two-factor) authentication if available. Make sure to renew your domain registration in a timely manner—with timely payments and register them for at least five (5) years. Use a domain-name registrar that offers enhanced transfer protection, i.e., “domain locking” and even consider paying for registry locking. Makes sure your WHOIS information is up-to-date and really points to you and you only. If you have 2500 or more domain names consider buying your own registrar. Relief via the Inter-Registrar Dispute Process 
- Major Domain Hijacking Alert: Industry Pioneer Warren Weitzman Has Over a Dozen Domains Stolen From his Enom Account
- Anatomy of a Domain Hijacking
- Wall Street Journal: Web-Address Theft Is Everyday Event
- Office of Attorney General - State of New Jersey: First Known Conviction in U.S. of Domain Theft
- Quotes from Landmark 2011 Domain Name Theft Case: First U.S. Criminal Conviction
- Stop Domain Theft - Alerting Media, Lawmakers, Law Enforcement
- non-profit trade organization representing domain name investors, website developers and related companies.
- How to Recover a Stolen Domain Name
- Domain Name Security Checker Tool
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