Domain Hijacking: The Often Overlooked Threat to Businesses

4 min Reading Time

Domain hijacking is an increasing security risk – yet few companies have it on their radar. Why abandoned domains can be dangerous – and how companies can better protect their digital identity – is shown in this article by Renata Jaffé, product manager and expert for additional products with a focus on value-added services at STRATO.

TL;DR

Underestimated Risk: Domain hijacking is one of the most overlooked cyber threats – with potentially devastating consequences for brand and business operations.
Simple Attack Vectors: Old data leaks, social engineering, and forgotten domain renewals often suffice.
Abandoned Domains Are Dangerous: Domains released after rebranding or business closure can be misused for phishing and identity theft.
Technical Protective Measures Available: 2FA, domain locking, DNSSEC, and WHOIS privacy prevent most attacks.
Executive Matter: Domain security belongs in the security concept – not in IT’s side projects.

Domain hijacking often operates in the shadows. Many companies do not actively manage their domains. After registration, they are often forgotten. This is precisely what makes them vulnerable. An example: In 2021, the Argentine Google domain “google.com.ar” was briefly available to the public – a user could register it for a few hundred pesos before it was quickly reclaimed. The exact sequence of events remains unclear but shows how quickly even large brands can lose control when protective measures are lacking.

Such scenarios remain critical: According to the Bitkom study, cybercrime causes annual damages of over 178 billion Euros – approximately two-thirds of all economic criminal losses. A central risk factor: digital assets like domains that, when inadequately secured, can become entry points for attacks.

What Makes Attackers So Successful

Behind many domain takeovers are not highly sophisticated exploits but human negligence. A password from an old data leak combined with a bit of social engineering – that’s often all it takes. A fake call to the provider, a seemingly harmless email, and attackers gain access to the domain account.

It becomes even easier when domains simply expire. Many domains can be reactivated for about 30 days after expiration – depending on the provider and extension, different deadlines apply. Missing such deadlines risks the permanent loss of the domain – a scenario that has already cost large corporations dearly.

Abandoned Assets, Real Risks

A particularly underestimated risk comes from domains that are supposedly already “gone,” for example, after a business closure, rebranding, or consolidation. What seems like a clean conclusion in theory becomes a security gap in practice: if the domain is taken over by third parties, incoming emails can be received with little effort, even if the company no longer exists. Password resets and login links can then fall into the wrong hands.

This is especially critical if email addresses like info@ or admin@ are still entered in old tools, accounts, or systems. Attackers don’t even need to be active; they just need to wait. A catch-all mail setup is sufficient. Therefore, domains that were once in use should never be released uncontrolled. They should either be replaced or secured.

Security Begins with Responsibility

Protecting domain infrastructure does not start with technology but with clear processes. Who is responsible? Which domains are critical? Are there automatic renewals, backups, and an emergency plan? These questions belong in the security concept, not in IT’s side projects. Treating domains like networks or user accounts minimizes risks and creates a solid foundation for digital resilience. This also includes: access only via central admin accounts, consistent two-factor authentication, and no shadow logins with private email addresses.

Gartner highlights in the Cybersecurity Trends 2025 survey that executives in companies increasingly want to ensure digital resilience through organizational control and risk analysis, and domain protection is no longer a side issue but part of the compliance and security strategy.

Consistently Utilize Technical Protective Measures

Many attacks can be defended against with built-in tools if they are used. Two-factor authentication is mandatory with every provider. Domain locking or registry locks prevent unauthorized transfers. DNSSEC protects against manipulation, and WHOIS privacy makes targeted attacks more difficult. Regular WHOIS checks and domain monitoring help detect suspicious changes early.

Many providers support their customers with features like automatic domain renewal, optional monitoring, and technical assistance for critical changes – so important addresses are not lost unnoticed. However, it’s not just about the offer but the awareness of how quickly things can get serious.

The Worst-Case Scenario Is Often a Matter of Days

Once a domain is lost, the first step usually involves contacting the registrar or registry – to stop the transfer or lock the domain. In disputes between registrars, the Transfer Dispute Resolution Policy (TDRP) applies to gTLDs. For cybersquatting or trademark violations, UDRP arbitration is used. This procedure applies primarily to generic domains. Country-code top-level domains (ccTLDs) follow their own rules – for example, DENIC (.de) or EURid (.eu).

Especially tricky: When domains are transferred anonymously or across borders, visibility and trust suffer. A clear emergency plan is indispensable – so teams can respond swiftly and decisively in a crisis. This includes alternative domain routing, rapidly deployable redirects, technical and legal contacts, and ideally, a backup domain for critical processes.

Domain Security Is Executive Matter

The domain is more than just a technical resource. It’s part of the brand identity – an outward-facing banner, a trust anchor. It appears on business cards, in email addresses, on posters, and in search engines. If it disappears – or worse, reappears in a questionable context – it’s not just a security problem, but a communications disaster. Protecting your brand means protecting its digital home – before the fire starts.

Domain hijacking affects both IT processes and brand perception – and ranks among the most critical cyber risks. Failing to secure domains risks surrendering control over your organization’s digital identity. No expensive specialized solutions are needed – just a clear stance: defined responsibilities, standardized safeguards, continuous monitoring, and robust protection. Cybersecurity Month is an ideal opportunity to act right here – at the digital front door, which often stands wide open because no one believes anyone will knock.

Key Facts at a Glance

Damage Volume: Cybercrime causes annual damages of over 178 billion Euros in Germany (Bitkom)

Attack Methods: Stolen passwords, social engineering, expired domains

Response Time: Approximately 30 days reactivation possible after domain expiration – depending on provider and extension

Protective Measures: 2FA, domain locking, registry lock, DNSSEC, WHOIS privacy, automatic renewal

Dispute Resolution: TDRP (Transfer Disputes), UDRP (Cybersquatting), DENIC (.de), EURid (.eu)

Fact: According to Europol’s Internet Organised Crime Threat Assessment 2025, DNS-based attacks, including domain hijacking, increased by 28% compared to the previous year.

Fact: The Verizon DBIR 2025 shows: In 17% of supply chain attacks, a compromised domain was the initial attack vector.

Frequently Asked Questions

What is domain hijacking exactly?

Domain hijacking refers to the unauthorized takeover of an internet domain by third parties. Attackers gain access to the domain account – for example, through stolen credentials, social engineering, or exploiting expired registrations – and thus take control of a company’s digital address.

Why are abandoned domains particularly dangerous?

Domains released after rebranding or business closure can be registered by third parties. Through a catch-all mail setup, the new owners then receive all incoming emails – including password resets and login links for still-linked accounts.

What technical protective measures are there against domain hijacking?

The most important measures are two-factor authentication for domain accounts, domain locking or registry locks against unauthorized transfers, DNSSEC to protect against DNS manipulation, and WHOIS privacy to make targeted attacks more difficult. Additionally, automatic renewal and regular domain monitoring help.

What to do if a domain has already been hijacked?

The first step is through the registrar or registry to stop the transfer. For gTLDs, the Transfer Dispute Resolution Policy (TDRP) applies, and for trademark infringements, the UDRP arbitration. For country-code top-level domains (ccTLDs), specific rules apply – for example, through DENIC (.de). A pre-defined emergency plan with alternative domain routes and legal contacts significantly speeds up the response.

Who in the company is responsible for domain security?

Domain security is not just a technical task but belongs in the security concept – with clear responsibilities, central admin accounts, and consistent two-factor authentication. Gartner now classifies domain protection as part of the compliance and security strategy.

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About the author: Tobias Massow

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