Avoid infecting your system with malware via "UAT Feedback" scam email

Also Known As: TrickBot trojan
Type: Trojan
Damage level: Severe

What is "UAT Feedback email virus"?

"UAT Feedback email virus" refers to a malware-proliferating spam campaign. This term defines a large-scale operation during which thousands of scam emails are sent. The letters distributed through this campaign - request recipients to review the attached UAT feedback. It must be emphasized that these emails are fake and intended solely for the purpose of infecting recipients' devices with the TrickBot trojan.

UAT Feedback malware-spreading email spam campaign

"UAT Feedback" email in detail

The "UAT Feedback" scam emails greet the recipient as a co-worker, thereby implying that the sender is a colleague. The letters state that the file attached to them - contains UAT feedback. UAT (User Acceptance Testing) is one of the final testing states in software development, intended to verify whether a product can perform the required tasks.

Recipients are asked to review the fake document and update the status section. Once the attachment is opened - it triggers TrickBot's infection chain. The process begins with a JavaScript-based loader malware, which downloads/installs the trojan in question.

TrickBot malware functionalities

There are multiple versions of the TrickBot trojan, and it is a highly versatile piece of malicious software. To overview the malware's primary functionalities, it has several anti-detection features - namely, it can disable the Microsoft Defender Antivirus (Windows Defender).

Many of this program's abilities are centered on stealing a broad range of personal and sensitive information. It can obtain data relating to the infected device, extract information from browsers and hijack them to modify the displayed webpages, steal vulnerable details from mobile service provider products, VPNs (Virtual Private Networks), email and FTP (File Transfer Protocol) clients, and other applications.

Information of interest includes (but is not limited to): users-system data, databases, browsing activity, Internet cookies, IP addresses, mobile service PIN numbers, various account/platform log-in credentials (i.e., IDs, email addresses, usernames, and passwords), finance-related information (e.g., banking account details, credit card numbers, etc.), and personally identifiable data.

Furthermore, TrickBot can operate as screen-locking ransomware. In other words, this trojan can lock the device's screen in order to make ransom demands for access recovery (screen unlocking). What is more, TrickBot can cause chain infections (i.e., download/install additional malware).

To summarize, by trusting the "UAT Feedback" scam emails, users can experience multiple system infections, severe privacy issues, financial losses, and identity theft. If it is suspected or known that the TrickBot trojan (or other malware) has already infected the system - an anti-virus must be used to remove it without delay.

Threat Summary:
Name TrickBot trojan
Threat Type Trojan, password-stealing virus, banking malware, spyware.
Hoax Scam emails request recipients to review the attached UAT feedback.
Attachment(s) document_report_0038774.zip (filename may vary)
Detection Names ALYac (Trojan.Downloader.Script.gen), ESET-NOD32 (PowerShell/TrojanDownloader.Agent.XF), GData (Script.Trojan.Agent.OV9IGC), Symantec (Trojan Horse), Full List Of Detections (VirusTotal)
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.
Payload TrickBot
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)

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Spam campaigns in general

"US$51,000.00 Had Been Transferred Into Your Account", "The Best Price List", and "Inbank Email Virus" are a few examples of scam emails designed to spread malware. These letters are typically presented as "official", "urgent", "priority", "important", and similar.

Deceptive emails are not used exclusively to distribute malicious software, they are also employed to facilitate phishing and other scams. Due to how widespread spam mail is, it is highly recommended to exercise caution with incoming emails and messages.

How did "UAT Feedback email virus" infect my computer?

Systems are infected via malicious files distributed through spam campaigns. The scam emails can contain download links of infectious files, or they can be attached to the letters. Virulent files can be in various formats, e.g., Microsoft Office and PDF documents, archives (ZIP, RAR, etc.), executables (.exe, .run, etc.), JavaScript, and so forth.

When the files are executed, run, or otherwise opened - the infection process (i.e., malware download/installation) is triggered. For example, Microsoft Office documents cause infections by executing malicious macro commands. This process is automatic in Microsoft Office versions released prior to 2010.

Newer Microsoft Office versions have "Protected View" mode that prevents immediate execution of macros. Instead, users can manually enable editing/content (i.e., macro commands), and they are warned of the potential risks.

How to avoid installation of malware?

To avoid infecting the system through spam mail, it is strongly advised against opening suspicious and irrelevant emails - especially any attachments or links present in them. Additionally, it is recommended to use Microsoft Office versions released after 2010.

Aside from spam campaigns, malware is also proliferated via dubious download channels (e.g., Peer-to-Peer sharing networks, unofficial and freeware sites, etc.), illegal activation tools ("cracks"), and fake updates. Therefore, it is important to download only from official/verified sources. Furthermore, all programs must be activated/updated using functions provided by genuine developers.

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

Text presented in the "UAT Feedback" scam email letter:

Subject: ***UNCHECKED*** Feedback IJL23874


Dear co-worker,


I trust this finds you well.


Attached is the copy of the UAT feedback IJL23874 collected ever since we started testing.


Kindly take time to review and update as far as the status section is concerned.


Thank you.


Kind regrds,





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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.

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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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