Avoid getting scammed by fake "CTT" emails

Also Known As: possible malware infections
Damage level: Medium

What is "CTT" email scam?

"CTT email scam" refers to a spam campaign. The emails sent through it are disguised as failed delivery notifications from CTT - Correios de Portugal, S.A. – the Portuguese national postal service and commercial group dealing in banking and e-commerce.

It must be emphasized that these letters are fake and in no way associated with the real CTT. This spam mail aims to promote a phishing website designed to record vulnerable data entered into it.

CTT email spam campaign

"CTT" email scam in detail

According to a rough translation, the "CTT" scam emails state that a delivery has failed due to unpaid customs fees. The letters contain brief particulars concerning the unsuccessful delivery and a more detailed statement concerning data confidentiality.

Phishing scams can target a wide variety of data. Sites of this type can be disguised as legitimate webpages (e.g., sign-in pages of online accounts).

Typically such scams target personally identifiable information, account usernames/passwords, finance-related data (e.g., banking account details, credit card numbers, etc.), and similar. The goal of all scams is to generate revenue, yet how they achieve it - depends on the cyber criminals' modus operandi.

Email accounts are commonly targeted as they are often used to register other accounts, platforms, and services. Hence, through stolen emails - access/control may be gained over content connected to them.

Communication (e.g., email, social networking, etc.) platforms can be used to promote scams and malware. Alternatively, scammers can pretend to be the account's genuine owner and ask their contacts for loans. Finance-related accounts (e.g., online banking, money transferring, e-commerce, etc.) can be used to make fraudulent transactions and/or online purchases.

Scam emails like "CTT" may also request recipients to make bogus payments (e.g., fake customs fees). In addition to direct monetary loss, users may also inadvertently expose their financial data - that the criminals can use for unauthorized transactions and purchases.

In summary, by trusting the "CTT" scam emails, users can experience severe privacy issues, financial losses, and identity theft.

Threat Summary:
Name CTT Email Scam
Threat Type Phishing, Scam, Social Engineering, Fraud
Fake Claim Emails claim that a delivery has failed due to unpaid customs fees.
Disguise Emails are disguised as notifications from CTT - Correios de Portugal, S.A.
Symptoms Unauthorized online purchases, changed online account passwords, identity theft, illegal access of the computer.
Distribution methods Deceptive emails, rogue online pop-up ads, search engine poisoning techniques, misspelled domains.
Damage Loss of sensitive private information, monetary loss, identity theft.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Combo Cleaner.
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Spam campaigns in general

"YOUR CORPORATE NETWORK HAS BEEN HACKED", "Host Europe Email Scam", "Network Solutions Email Scam", and "Covid-19 Stimulus Payment" are a few examples of scam emails.

Spam campaigns are used for phishing and various other schemes. Furthermore, these emails can also be employed to proliferate malware (e.g., ransomware, trojans, cryptocurrency miners, etc.). Due to how widespread spam mail is, exercising caution with incoming emails and messages is strongly recommended.

How do spam campaigns infect computers?

Spam emails can have infectious files as attachments or download links. These files can be Microsoft Office and PDF documents, archives, executables, JavaScript, etc. When virulent files are opened - malware download/installation is jumpstarted.

For example, Microsoft Office documents infect systems by executing malicious macro commands. This process is triggered when a document is opened in Microsoft Office versions released before 2010. Newer versions have "Protected View" mode that prevents this from triggering; instead, users can manually enable macros. It is noteworthy that infectious documents often contain deceptive messages to trick users into allowing macro commands.

How to avoid installation of malware?

The attachments and links found in suspicious or irrelevant emails - must not be opened. It is recommended to use Microsoft Office versions released after 2010.

In addition to spam mail, malware is spread via dubious download channels (e.g., unofficial and freeware sites, Peer-to-Peer sharing networks, etc.), illegal software activation tools ("cracks"), and fraudulent updates. Hence, it is advised to always download from official/verified sources and activate/update programs with tools provided by genuine developers.

It is crucial to have a reputable anti-virus installed and kept updated. This software has to be used to run regular system scans and to remove threats. If you've already opened malicious attachments, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate infiltrated malware.

Text presented in the fake "CTT" email letter:

Subject: O seu número de entrega PT63 ** 726

O seu número de entrega PT35 **** 726 ainda não foi entregue pelo seguinte motivo: Taxas alfandegárias.


Falha na tentativa de entrega: , 18/10/2021
Entrega estimada: , 19/10/2021
Para receber a sua encomenda amanhã, envie-nos a morada correcta e a nova página de portes de envio (€ 4,99)


através do link abaixo:






As empresas do grupo CTT (“CTT”) estão empenhadas em proteger a segurança e a confidencialidade dos dados pessoais.
Neste contexto, os CTT elaboraram a presente Política de Privacidade, com o objetivo de conhecer as condições em que os CTT recolhem e processam dados pessoais, de acordo com o Regulamento (UE)
2016/679 do Parlamento Europeu e do Conselho, de 27 de abril de 2016 (Regulamento Geral de Proteção de Dados - “RGPD”) e demais legislação sobre proteção de dados pessoais.

Another example of CTT scam email:

CTT spam email (2021-10-29)

Text presented within:

Subject: Para amanhã receber a sua encomenda,


ultimo lembrete

O seu número de entrega PT35 **** 726 ainda não foi entregue pelo seguinte motivo: Endereço errado

Falha na tentativa de entrega: 28/10/2021, 10h50.
Previsão de entrega: 30/10/2021 2021, das 10h00 às 12h00
Para receber a sua encomenda amanhã, envie-nos a morada correcta e pague os novos portes de envio 4.99 €
(IVA incluido)
através do link abaixo:



Corrija o seu endereço antes das 23h59 para recebê-lo amanhã

O seu serviço de atendimento dos CTT Correios de Portugal.
Sede dos CTT Correios de Portugal

Preços dos serviços postais aplicáveis ao serviço nacional e internacional. Os CTT disponibilizam dois níveis de preços: P
reços Base e Preços de Quantidade.Preços Base:
Aplicáveis a expedições efetuadas por qualquer pessoa singular ou coletiva através de envios selados,
franquiados ao balcão e pré-pagos ou no âmbito de um contrato formalizado com os CTT
excetuando máquinas de franquiar), cujo volume de faturação, no ano civil anterior,
não atingiu o valor mínimo definido para o respetivo tipo de contrato.
Preços de Quantidade: Aplicáveis a expedições efetuadas por pessoa singular ou coletiva, no âmbito de um contrato formalizado com os CTT,
cujo volume de faturação, no ano civil anterior, atingiu o valor mínimo definido para o respetivo tipo de contrato.

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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How to remove malware manually?

Manual malware removal is a complicated task - usually it is best to allow antivirus or anti-malware programs to do this automatically. To remove this malware we recommend using Combo Cleaner Antivirus for Windows.

If you wish to remove malware manually, the first step is to identify the name of the malware that you are trying to remove. Here is an example of a suspicious program running on a user's computer:

Malware process running in the Task Manager

If you checked the list of programs running on your computer, for example, using task manager, and identified a program that looks suspicious, you should continue with these steps:

manual malware removal step 1Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:

Autoruns application appearance

manual malware removal step 2Restart your computer into Safe Mode:

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Run Windows 7 or Windows XP in Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup.

Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings".

Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Run Windows 8 in Safe Mode with Networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options".

In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

Run Windows 10 in Safe Mode with Networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

manual malware removal step 3Extract the downloaded archive and run the Autoruns.exe file.

Extract Autoruns.zip archive and run Autoruns.exe application

manual malware removal step 4In the Autoruns application, click "Options" at the top and uncheck "Hide Empty Locations" and "Hide Windows Entries" options. After this procedure, click the "Refresh" icon.

Refresh Autoruns application results

manual malware removal step 5Check the list provided by the Autoruns application and locate the malware file that you want to eliminate.

You should write down its full path and name. Note that some malware hides process names under legitimate Windows process names. At this stage, it is very important to avoid removing system files. After you locate the suspicious program you wish to remove, right click your mouse over its name and choose "Delete".

Delete malware in Autoruns

After removing the malware through the Autoruns application (this ensures that the malware will not run automatically on the next system startup), you should search for the malware name on your computer. Be sure to enable hidden files and folders before proceeding. If you find the filename of the malware, be sure to remove it.

Search for malware and delete it

Reboot your computer in normal mode. Following these steps should remove any malware from your computer. Note that manual threat removal requires advanced computer skills. If you do not have these skills, leave malware removal to antivirus and anti-malware programs.

These steps might not work with advanced malware infections. As always it is best to prevent infection than try to remove malware later. To keep your computer safe, install the latest operating system updates and use antivirus software. To be sure your computer is free of malware infections, we recommend scanning it with Combo Cleaner Antivirus for Windows.

Frequently Asked Questions (FAQ)

Why did I receive this email?

Spam emails are not personal; they are sent by the thousand in large-scale operations. The cyber criminals' hope - is that at least some recipients will fall for their schemes.

I have provided my personal information when tricked by this spam email, what should I do?

If you've disclosed account credentials - immediately change the passwords of all potentially exposed accounts and contact their official support. And if you've provided other personal data (e.g., ID card details, credit card numbers, etc.) - contact the relevant authorities without delay.

I have read a spam email but didn't open the attachment, is my computer infected?

No, opening and reading a spam email is harmless. Infection processes are triggered by opening attached files or the links present in such emails.

I have downloaded and opened a file attached to a spam email, is my computer infected?

Whether your system was infected - depends on the attachment's format. If it was an executable - then yes, your system is most likely infected. However, if it was a document (e.g., .doc, .pdf, etc.) - you might have avoided jumpstarting an infection, as these formats often require additional actions (e.g., macro command enablement, etc.).

Will Combo Cleaner remove malware infections present in email attachments?

Yes, Combo Cleaner can scan systems, detect and eliminate most known malware infections. It is noteworthy that performing a full system scan is crucial, as high-end malicious programs usually hide deep within the system.

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

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