
Spoofing is a type of cyber attack in which malicious actors create a fraudulent website or alter their phone number to mimic a legitimate one. It is used to gain access to personal information, spread malware, or bypass network access controls. While spoofing itself is not illegal in Australia, using it for malicious or unlawful purposes is. This includes caller ID spoofing, which involves hiding the scammer's number and displaying a different one, usually an Australian number, to increase the likelihood of the recipient answering the call. Website spoofing, on the other hand, involves creating fake websites that look identical to real ones to steal information. It often involves copyright infringement and trademark violations, which can lead to violations of data protection laws such as the Privacy Act 1988 in Australia.
| Characteristics | Values |
|---|---|
| Is spoofing illegal in Australia? | Unless used for malicious purposes, spoofing is not illegal in Australia. |
| What is spoofing? | Spoofing is the act of changing a caller ID to make it look like the call or text comes from a trusted or legitimate source. |
| What is the purpose of spoofing? | To verbally convince their targets to provide sensitive information such as passwords and account information. |
| Who is impacted by spoofing? | Individuals and organisations large and small. |
| What to do if you are a victim of spoofing? | Contact your telco and ask them to run a filter on your number across their telephone network. |
| How to identify if a number is spoofed? | Most spoofed numbers share your area code and exchange number. |
| How to prevent spoofing? | Do not answer calls from unknown numbers. |
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What You'll Learn
- Caller ID spoofing is illegal when used for malicious or unlawful purposes
- CLI overstamping is legal in Australia, but CLI spoofing is not
- Phone spoofing can be used to steal personal information
- Website spoofing involves creating fake websites to steal information
- Telcos are obliged to intervene when malicious spoofing occurs

Caller ID spoofing is illegal when used for malicious or unlawful purposes
Caller ID spoofing is a technique used by scammers and telemarketers to mask their real phone number and display a different number, often from a local or legitimate source, to increase the likelihood of the recipient answering the call. While CLI overstamping is legal in Australia, caller ID spoofing is illegal when used for malicious or unlawful purposes, such as scams or obtaining sensitive information.
In Australia, caller ID spoofing is commonly used for scams, with scammers impersonating banks, government agencies, or telcos to trick people into giving up personal or financially sensitive information. This can have severe reputational and financial consequences for individuals and businesses whose phone numbers have been spoofed. The Australian Cyber Security Centre (ACSC) has issued alerts regarding malicious actors calling from spoofed Australian phone numbers and posing as ACSC employees.
To combat caller ID spoofing, telcos in Australia have implemented measures such as blocking suspected scam calls and putting strict controls in place to prevent caller ID spoofing. However, the increasing sophistication of spoofing practices poses a challenge in detecting and blocking all spoofed calls.
If you believe your number has been spoofed, you should contact your telco immediately and report the issue. You can also place a temporary message on your voicemail alerting callers that your number has been spoofed. It is important to keep your antivirus software up-to-date, regularly change sensitive passwords, and be cautious about opening suspicious text messages or answering unknown calls.
While caller ID spoofing for malicious purposes is illegal in Australia, it is important for individuals to remain vigilant and take proactive measures to protect themselves from becoming victims of spoofing scams.
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CLI overstamping is legal in Australia, but CLI spoofing is not
CLI overstamping, also known as Calling Line Identification, allows a caller to display a different number from the one they are calling from. For example, a company may overstamp their calls with an Australian number so that the recipient recognises the caller and is more likely to answer. This practice is legal in Australia unless it is exploited to conduct malicious activity, such as scams.
In contrast, CLI spoofing is an unlawful and malicious practice that involves deliberately falsifying the phone number or caller ID information that appears on the recipient's device. It is a technique used in mobile network fraud to hide the scammer's true identity and location, often impersonating a local number or a trusted brand. By spoofing their number, scammers increase the likelihood that the recipient will answer the call, enabling them to deceive and manipulate the recipient into disclosing sensitive information.
CLI spoofing has been used in various scams, including impersonating government agencies, banks, and healthcare providers to extract personal and financial information from victims. It has also been employed in robocalls, spam, one-ring scams, and voice phishing (vishing) attacks. The Australian Communications and Media Authority (ACMA) has established guidelines and industry codes, such as 'Industry Code C661:2022 Reducing Spam Calls and SCAM SMS', to combat the increasing number of scams impacting Australians.
While CLI overstamping is a legal practice in Australia, it is important for organisations to adhere to ACMA's guidelines and register their phone numbers to ensure they are not classified as scammers. By following these regulations, businesses can effectively utilise CLI overstamping for legitimate purposes, such as displaying a different phone number for outbound calls or sending text messages on behalf of their clients.
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Phone spoofing can be used to steal personal information
In Australia, phone spoofing is a growing problem, with scammers using it to gain access to personal information. Caller ID spoofing allows fraudsters to manipulate the caller ID to disguise their identity and make it seem like they are calling from a trusted source, such as a familiar area code or a local number. This increases the likelihood of the recipient answering the call.
Scammers use phone spoofing to target individuals and gain access to their sensitive personal information, such as passwords, account information, login credentials, financial information, and other personal details. They then use this information for fraudulent activity or sell it illegally. For example, scammers may pretend to be from a government agency, a bank, or another trusted source and ask for personal details under false pretenses.
Phone spoofing can also lead to financial scams, reputational damage, and legal issues for the victims. If a scammer calls from a spoofed number that belongs to someone else, the owner of that number may face accusations and reputational damage. Additionally, individuals whose numbers have been spoofed may receive angry calls and messages from strangers, which can be distressing, especially for the elderly.
To protect against phone spoofing, it is important to keep your phone number private and be cautious about sharing personal information online or with unfamiliar senders. It is also recommended to regularly review your phone bill for any unusual activity and report any suspected spoofing or scam activity to the relevant authorities, such as the Australian Cyber Security Centre (ACSC) or Scamwatch.
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Website spoofing involves creating fake websites to steal information
Spoofing is not illegal in Australia unless it is done for malicious or unlawful purposes. While CLI overstamping is legal in Australia, CLI spoofing, which involves hiding one's number and displaying a different one, is unlawful.
The goal of website spoofing is to lure a brand's customers, suppliers, partners, and employees to a fraudulent website and convince them to share sensitive information such as login credentials, Social Security numbers, credit card information, or bank account numbers. This is often achieved through phishing attacks, where users are tricked into interacting with a malicious email or website that appears legitimate. Email spoofing is a common technique used in conjunction with website spoofing, where attackers send phishing emails with links to the spoof website.
To protect against website spoofing, it is recommended to bookmark important websites and always access them through the bookmark instead of clicking on links or typing the URL. Additionally, users should be cautious of unexpected emails or warnings, carefully examine URLs for any irregularities, and ensure that websites have SSL certificates, which help verify the website's identity.
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Telcos are obliged to intervene when malicious spoofing occurs
In Australia, spoofing is not illegal unless it is done for malicious purposes. Malicious spoofing involves scammers using social engineering techniques to verbally convince their targets to provide sensitive information such as passwords and account information. This can be done by impersonating a trusted source such as a bank, a government agency, or a telco. It can also involve the unauthorized use of a public number to mask or mislead the receiving party about the origin of the call. As a result, telcos are obliged to intervene when malicious spoofing occurs.
Telcos have put systems in place to reduce the ability to spoof Australian phone numbers. They work together to exchange information and actively block scam calls. For example, Telstra has strict controls to help prevent caller ID spoofing and is now blocking over 13 million suspected scam calls per month. However, telcos have been criticized for not doing enough to address the rising rates of phone spoofing. There are no established processes for notifying telcos of spoofing incidents or set procedures to deal with and follow up on incidents.
If you believe your number has been spoofed, you should contact your telco immediately. You can also place a temporary message on your voicemail to alert callers that your number has been spoofed. It is recommended to not answer calls from unknown numbers and to regularly change sensitive passwords.
While telcos are obliged to intervene, the onus is currently on the recipient of spoofed calls to deal with the problem. This has created a situation where individuals and organizations are left to protect themselves from spoofing attacks. As such, it is important for individuals and organizations to be aware of the risks and take steps to protect their personal and sensitive information.
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Frequently asked questions
Spoofing is when someone changes a caller ID to make it look like the call or text is coming from a trusted or legitimate source. It is often used to gain access to personal information, spread malware through infected links or attachments, and bypass network access controls.
Spoofing is not illegal in Australia unless it is done for malicious or unlawful purposes, such as scams or phishing attempts. In these cases, it is referred to as "CLI spoofing" and is illegal. Telcos are obliged to intervene when malicious spoofing occurs.
If you receive a spoofed call or text, you should hang up or not respond. You can also report the incident to your telco and Scamwatch, and contact IDCARE for support and advice. It is also recommended to keep antivirus software up-to-date, regularly change sensitive passwords, and be cautious when opening suspicious text messages or answering unusual calls.




















