Avoid malware infections spread by "SECRETO PROFESIONAL Y CONFIDENCIAL" emails

Damage level: Severe


Our inspection of the "SECRETO PROFESIONAL Y CONFIDENCIAL" email revealed that it is spam used to proliferate malware. This letter is in Spanish and claims to contain highly confidential information in the attachment (although it does not specify further).

This email is designed to trick recipients into opening the attached file - thereby triggering GuLoader malicious program's download/installation.



According to a rough translation, the email with the subject/title "1722403906461L" (may vary) informs recipients that it is an automated message that does not require any response. Following this statement, the email provides a confidentiality warning.

Allegedly, the letter (attachment) contains a professional secret - hence, if recipients have received it by mistake, they must notify the sender. Additionally, it states that any reproduction or distribution of this information is prohibited.

The purpose of this utterly fake message is to lure recipients into opening the attached file - as urged by either confusion or curiosity. After the attachment is opened (archived file extracted and the executable run) - GuLoader's infection process is initiated.

This malicious program is designed to infect devices with additional malware. Theoretically, programs of this kind can inject any type of malware into a system. Hence, GuLoader may cause trojan, ransomware, cryptominer, and various other infections. More information on this program can be found in our article on GuLoader malware.

To summarize, by trusting the "SECRETO PROFESIONAL Y CONFIDENCIAL" email - victims can experience multiple system infections, data loss, severe privacy issues, financial losses, and identity theft.

If you suspect that your system is infected with GuLoader (or other malware), we strongly advise using an anti-virus to remove it without delay.

Threat Summary:
Threat Type Trojan, password-stealing virus, banking malware, spyware.
Fake Claim Email attachment contains a professional secret and other confidential information.
Attachment(s) "FRACCIONAMIENTO_1722403906461L.zip" containing "FRACCIONAMIENTO_1722403906461L.exe" (filenames may vary)
Detection Names Avast (NSIS:InjectorX-gen [Trj]), Combo Cleaner (Trojan.GenericKD.48896048), ESET-NOD32 (NSIS/Injector.ASH), Kaspersky (HEUR:Trojan-Downloader.Win32.GuLoade), Microsoft (Trojan:Win32/GuLoader.SSS!MTB), Full List Of Detections (VirusTotal)
Payload GuLoader
Symptoms Trojans are designed to stealthily infiltrate the victim's computer and remain silent, and thus no particular symptoms are clearly visible on an infected machine.
Distribution methods Infected email attachments, malicious online advertisements, social engineering, software 'cracks'.
Damage Stolen passwords and banking information, identity theft, the victim's computer added to a botnet.
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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Malspam campaign examples

We have analyzed thousands of malware-spreading emails; "DHL Air Waybill Email Virus", "ERGIFE Email Virus", "DHL Express - Called But Got No Answer" - are just a few examples of our latest finds.

Spam letters are also used for phishing and various other scams. These emails are usually presented as "official", "urgent", "important", and similar. Spam mail is widespread - therefore, we highly recommend exercising caution with incoming emails and messages.

How do spam campaigns infect computers?

Spam emails infect systems via malicious content distributed through them. These letters can contain infectious attachments or links leading to malicious websites (designed to stealthily download/install malware or entice users into doing so themselves).

Virulent files can be archives (ZIP, RAR, etc.), executables (.exe, .run, etc.), Microsoft Office and PDF documents, JavaScript, and so on. Once an infectious file is opened - the infection chain is initiated. For example, Microsoft Office documents infect systems by executing malicious macro commands.

How to avoid installation of malware?

We advise against opening/clicking the attachments and links present in dubious/irrelevant emails and messages - as doing so can result in a system infection. Additionally, it is important to use Microsoft Office versions released after 2010, as their "Protected View" mode prevents automatic macro command execution.

Malware is not spread exclusively via spam mail. Therefore, we also recommend downloading only from official/verified channels and activating/updating software with tools provided by genuine developers.

It is paramount to have a reputable anti-virus installed and updated. Security programs must be used to perform regular system scans and to remove detected/potential 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 "SECRETO PROFESIONAL Y CONFIDENCIAL" email letter:

Subject: 1722403906461L

Se adjunta carta de FRACCIONAMIENTO

Por favor, no responda este mensaje. Se trata de un envío automatizado desde una dirección de correo no atendida.

La información incluida en este correo electrónico es SECRETO PROFESIONAL Y CONFIDENCIAL.
Si usted no es el destinatario del mensaje o ha recibido esta comunicación por error, le informamos que cualquier difusión, distribución o reproducción de esta comunicación está estrictamente prohibida, por favor notifíquenos de inmediato y devuelva el mensaje original a la dirección anterior.


Screenshot of VirusTotal detections of the malicious attachment distributed via "SECRETO PROFESIONAL Y CONFIDENCIAL" spam campaign ("FRACCIONAMIENTO_1722403906461L.exe"):

SECRETO PROFESIONAL Y CONFIDENCIAL attachment detections on VirusTotal (FRACCIONAMIENTO_1722403906461L.exe)

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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Quick menu:

Types of malicious emails:

Phishing email icon Phishing Emails

Most commonly, cybercriminals use deceptive emails to trick Internet users into giving away their sensitive private information, for example, login information for various online services, email accounts, or online banking information.

Such attacks are called phishing. In a phishing attack, cybercriminals usually send an email message with some popular service logo (for example, Microsoft, DHL, Amazon, Netflix), create urgency (wrong shipping address, expired password, etc.), and place a link which they hope their potential victims will click on.

After clicking the link presented in such email message, victims are redirected to a fake website that looks identical or extremely similar to the original one. Victims are then asked to enter their password, credit card details, or some other information that gets stolen by cybercriminals.

Email-virus icon Emails with Malicious Attachments

Another popular attack vector is email spam with malicious attachments that infect users' computers with malware. Malicious attachments usually carry trojans that are capable of stealing passwords, banking information, and other sensitive information.

In such attacks, cybercriminals' main goal is to trick their potential victims into opening an infected email attachment. To achieve this goal, email messages usually talk about recently received invoices, faxes, or voice messages.

If a potential victim falls for the lure and opens the attachment, their computers get infected, and cybercriminals can collect a lot of sensitive information.

While it's a more complicated method to steal personal information (spam filters and antivirus programs usually detect such attempts), if successful, cybercriminals can get a much wider array of data and can collect information for a long period of time.

Sextortion email icon Sextortion Emails

This is a type of phishing. In this case, users receive an email claiming that a cybercriminal could access the webcam of the potential victim and has a video recording of one's masturbation.

To get rid of the video, victims are asked to pay a ransom (usually using Bitcoin or another cryptocurrency). Nevertheless, all of these claims are false - users who receive such emails should ignore and delete them.

How to spot a malicious email?

While cyber criminals try to make their lure emails look trustworthy, here are some things that you should look for when trying to spot a phishing email:

  • Check the sender's ("from") email address: Hover your mouse over the "from" address and check if it's legitimate. For example, if you received an email from Microsoft, be sure to check if the email address is @microsoft.com and not something suspicious like @m1crosoft.com, @microsfot.com, @account-security-noreply.com, etc.
  • Check for generic greetings: If the greeting in the email is "Dear user", "Dear @youremail.com", "Dear valued customer", this should raise suspiciousness. Most commonly, companies call you by your name. Lack of this information could signal a phishing attempt.
  • Check the links in the email: Hover your mouse over the link presented in the email, if the link that appears seems suspicious, don't click it. For example, if you received an email from Microsoft and the link in the email shows that it will go to firebasestorage.googleapis.com/v0... you shouldn't trust it. It's best not to click any links in the emails but to visit the company website that sent you the email in the first place.
  • Don't blindly trust email attachments: Most commonly, legitimate companies will ask you to log in to their website and to view any documents there; if you received an email with an attachment, it's a good idea to scan it with an antivirus application. Infected email attachments are a common attack vector used by cybercriminals.

To minimise the risk of opening phishing and malicious emails we recommend using Combo Cleaner Antivirus for Windows

Example of a spam email:

Example of an email spam

What to do if you fell for an email scam?

  • If you clicked on a link in a phishing email and entered your password - be sure to change your password as soon as possible. Usually, cybercriminals collect stolen credentials and then sell them to other groups that use them for malicious purposes. If you change your password in a timely manner, there's a chance that criminals won't have enough time to do any damage.
  • If you entered your credit card information - contact your bank as soon as possible and explain the situation. There's a good chance that you will need to cancel your compromised credit card and get a new one.
  • If you see any signs of identity theft - you should immediately contact the Federal Trade Commission. This institution will collect information about your situation and create a personal recovery plan.
  • If you opened a malicious attachment - your computer is probably infected, you should scan it with a reputable antivirus application. For this purpose, we recommend using Combo Cleaner Antivirus for Windows.
  • Help other Internet users - report phishing emails to Anti-Phishing Working Group, FBI’s Internet Crime Complaint Center, National Fraud Information Center and U.S. Department of Justice.

Frequently Asked Questions (FAQ)

Why did I receive this email?

Spam emails are sent in large-scale operations; hence, thousands of users receive the same letter(s).

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

No, opening such an email will not jumpstart any system infection processes. Malware download/installation is initiated when the attached files or links contained in the emails - are opened/clicked.

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

If the opened file was an executable (.exe, .run, etc.) - most likely, yes. However, you might have avoided infecting your device if it was a document (.doc, .xls, .pdf, etc.). These formats may require additional user interaction (e.g., enabling macro commands) to begin downloading/installing malware.

Will Combo Cleaner remove malware infections present in email attachments?

Yes, Combo Cleaner is capable of detecting and eliminating nearly all of the known malware infections. However, performing a full system scan is crucial - since sophisticated malicious programs typically hide deep within systems.

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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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