How to uninstall Trojans distributed via SolarSys framework?

Also Known As: SolarSys Trojan distribution framework
Type: Trojan
Distribution: Low
Damage level: Severe

SolarSys banking Trojan removal guide

What is SolarSys banking Trojan?

SolarSys is the name of the Trojan distribution network composed of various JavaScript backdoors, mail worms and spying modules. It is known that cyber criminals behind this framework distribute Trojans via fake MSI installers (also known as Windows and Microsoft installers) for Java, Microsoft HTML Help and other programs. This framework is mainly active it Brazil, although, cyber criminals may target other countries as well. Research shows that SolarSys is used to steal sensitive information either through browsers or via phishing emails.

SolarSys banking Trojan malware

As mentioned in the introduction, cyber criminals behind SolarSys use fake Windows installers to distribute malware. After being launched, they execute a backdoor in memory which runs malicious JavaScript scripts that are designed to send phishing emails from victim's computer. Typically, such emails are used to trick recipients into providing some sensitive information like usernames, passwords and credit card details directly through them or fake, deceptive websites. Furthermore, the aforementioned backdoor launches an information stealing module (banking Trojan) which targets login credentials, browsing history and some other data. It attempts to steal information by displaying fake online banking login interfaces where users are asked to provide login credentials. Research shows that this banking Trojan mimicks login pages of banks such as Bradesco, Banco do Nordeste, Banco Mercantil, CrediSIS, Banrisul, Safra, Banpará, Banco do Brasil, Banco Itaú, Santander, Sicoob, Banestes, and some other banks in Brazil. Basically, cyber criminals behind SolarSys framework attempt to gain sensitive information that could be misused to steal accounts, identities, make fraudulent purchases, transactions and/or for other malicious purposes.

Threat Summary:
Name SolarSys Trojan distribution framework
Threat Type Trojan, password-stealing virus, banking malware, spyware.
Detection Names (78c9e.msi) Avast (Win32:Trojan-gen), BitDefender (Trojan.GenericKD.44068249), ESET-NOD32 (A Variant Of Win32/Injector.ENOO), Kaspersky (Trojan.Win32.Agentb.kanp), Full List (VirusTotal)
Payload Mail worms, spyware modules
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 Fake Windows (MSI) installers, infected email attachments, malicious online advertisements, social engineering, software 'cracks'.
Damage Stolen passwords and banking information, identity theft, monetary loss
Malware Removal (Windows)

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A couple of examples of other Trojans that are designed to steal sensitive information are Covid, QNodeService, RedLine Stealer and Babax. It is common that users who get their computers infected with banking Trojans, spyware, and/or other malicious programs of this kind become victims of identity theft, lose access to personal accounts, suffer monetary loss and other serious issues. If there is a reason to believe that such malware is installed on the operating system, them it should be eliminated as soon as possible.

How did SolarSys banking Trojan infiltrate my computer?

As mentioned in the previous paragraphs, cyber criminals behind SolarSys distribute JavaScript backdoors, mail worms and spying modules via fake MSI installers (also known as Windows, Microsoft) installers for Java, Microsoft HTML Help and some other programs. It is worthwhile to mention that fake installers can be used to distribute not only Trojans but also ransomware-type programs, cryptocurrency miners, adware and other unwanted, malicious programs. Typically, such installers are distributed via unofficial websites, also, they may be available for download on various Peer-to-Peer networks (e.g., torrent clients, eMule), free file hosting pages, and other unreliable software download sources.

How to avoid installation of malware?

Installed software has to be activated and/or updated (if it is necessary) with tools that are designed/provided by official developers, none of the other (unofficial, third party) tools are trustworthy. Also, it is not legal to use unofficial activation tools to activate licensed software, or use installers for pirated software. Irrelevant emails that have attachments, website links in them and are received from unknown, suspicious addresses should not be trusted. It is advised not to open files and/or links in such emails without being sure that it is completely safe. Files and programs should not be downloaded and/or or installed through third party downloaders, installers, from unofficial pages and other sources of this kind. It is advised to do that using only official websites and direct download links. Additionally, a computer should be scanned with a reputable antivirus or anti-spyware suite regularly. If you believe that your computer is already infected, we recommend running a scan with Malwarebytes for Windows to automatically eliminate infiltrated malware.

Fake MSI installer ("Microsoft HTML Help") used to distribute SolarSys banking Trojan:

solarsys banking trojan installer

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes 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 Malwarebytes 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 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 Malwarebytes for Windows.

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 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.

QR Code
SolarSys Trojan distribution framework QR code
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