Avoid clicking links in emails like Undelivered Mails email scam

Also Known As: possible malware infections
Damage level: Medium

What is Undelivered Mails Scam?

Scammers use email as a tool for various purposes. One of them is to trick recipients into providing personal information. Emails of this type are called phishing emails.

Typically, scammers behind emails of this type pretend to be legitimate companies and try to trick recipients into providing login credentials (for example, usernames, passwords), credit card details (for example, cardholder name, CVV code, expiry date), social security numbers or other sensitive details.

It is common that scammers use deceptive websites to trick users into providing information. For example, they disguise fake login pages as legitimate, official sites. In one way or another, emails (and links in them) of this type should be ignored.

Undelivered Mails Scam email spam campaign

This email is disguised as a letter from email service provider (Webmail). Scammers behind it attempt to trick recipients into believing that twelve emails were not delivered due to a system delay and clicking the "Click Here To Release Pending Messages Inbox" hyperlink.

The provided link opens a deceptive website asking to enter login credentials (email address and password). There are many examples of similar phishing emails that scammers use with the purpose to steal email accounts.

It is common that scammers check accessed accounts for important emails containing sensitive information, use them to trick other people into making money transactions, providing personal information, and for other malicious purposes (e.g., to send spam, malspam). Another problem with having an email (or other) account stolen is that its login credentials could be used to access other accounts (e.g., social media, gaming accounts).

Although, it is a problem only when users use the same login credentials for multiple accounts (for this reason, it is recommended to use different passwords for different accounts).

Threat Summary:
Name Undelivered Mails Scam
Threat Type Phishing, Scam, Social Engineering, Fraud
Fake Claim Twelve emails were not delivered due to a system delay
Disguise Letter from email service provider
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)

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More examples of phishing emails are "BANCO BPM Email Scam", "Emails Rejected On Admin Server Scam", and "New App(s) Have Access To Your Microsoft Account Email Scam". What most of them have in common is that they are designed to look like letters from legitimate entities and include suspicious attachments or links.

As mentioned in the first paragraph, scammers use phishing emails to extract login credentials, credit card details, and other sensitive information that could be used to steal identities, make unauthorized purchases, transactions, and for other malicious purposes. It is important to mention that email can be used as a tool to distribute malware.

Emails used to deliver malware are quite similar to emails used to extract sensitive information. A couple of examples of emails that cybercriminals use to trick recipients into installing malware on their computers are "Santander Email Virus", "Contech Email Virus", and "Air Sea Land Email Virus".

How do spam campaigns infect computers?

As a rule, emails used to deliver malware contain a malicious attachment or link. In both cases, the main purpose of these emails is to trick recipients into downloading and opening a malicious file.

Typically, cybercriminals behind emails of this type attempt to trick recipients into opening/executing a malicious file extracted from ZIP, RAR or another file, Microsoft Office document, PDF document, executable file (like EXE), or JavaScript file. It is important to mention that cybercriminals try to trick recipients into believing that the received file is some important document (e.g., a purchase order, invoice).

In one way or another, it is strongly recommended not to open files or click links in emails of this kind. It is worthwhile to mention that not all malicious documents infect computers automatically.

If opened with MS Office 2010 or later, those documents need to get permission to enable macros commands (editing or content). Although, older MS Office versions do not have the "Protected View" mode that prevents opened malicious documents from installing malware without needing any user's interference.

How to avoid installation of malware?

Emails including links or attachments should be thoroughly analyzed, especially if they are received from an unknown sender and are not relevant. It is common that emails of this type are used to deliver malware - cybercriminals behind them seek to trick recipients into opening malicious files.

Files and programs should be downloaded only from official pages and via direct links. Other sources can be used to distribute malicious files/programs. Examples of questionable sources are Peer-to-Peer networks (like torrent clients, eMule), unofficial websites, third-party downloaders, free file hosting sites.

It is worth mentioning that third-party, fake installers can be used to distribute malware too. One more important thing is not to use third-party, unofficial tools to activate or update software.

Quite often, those tools are bundled with malware (used to distribute malicious software). Another problem is that it is illegal to activate legitimate software with 'cracking' tools.

Installed programs have to be activated, updated with tools or functions that their official developers provide. Additionally, it is recommended to scan the operating system threats regularly and do it using a reputable antivirus or anti-spyware software.

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 Undelivered Mails Scam email letter:

Subject: ACCOUNT WARNING: Undelivered mails ******** Kindly rectify

Dear ********
You have [12] undelivered mails on 6/6/2021 7:19:35 a.m. This was caused due to a system delay, Rectify Below:

Click Here To Release Pending Messages Inbox

Product: ********  WebMail

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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:

malicious process running on user's computer sample

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:

screenshot of autoruns application

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.

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.

Windows 8 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.

windows 10 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 and run autoruns.exe

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.

Click 'Options' at the top and uncheck 'Hide Empty Locations' and 'Hide Windows Entries' options

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".

locate the malware file you want to remove

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.

searching for malware file on your computer

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.

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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.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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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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