Chthonic virus removal guide
What is Chthonic?
Chthonic is a Trojan-type program that is installed through emails sent from hijacked/stolen PayPal accounts. The program leads to a fake Google Chrome update file that is promoted on the hijacked website. Visitors are informed that their Chrome browser is outdated and needs to be updated by clicking the "Update Chrome" button, which leads to download of a malicious file used to install the Chthonic banking trojan.
|Threat Type||Trojan, password-stealing virus, banking malware, spyware.|
|Detections||Avira (HEUR/Suspar.Gen), F-Secure (Heuristic.HEUR/Suspar.Gen), TrendMicro (HEUR_JSRANSOM.O2).|
|Malicious Process Name(s)||Microsoft ® Windows Based Script Host (generic name of Windows Script Host process name).|
|Symptoms||Trojans are designed to stealthily infiltrate the victim's computer and remain silent. 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 banking information, passwords, identity theft, 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 Malwarebytes.
Other examples of Trojan-type programs are Emotet, LokiBot, and Adwind. There are many others. Most of these programs are designed to steal sensitive data, however, some of these computer infections might spread other viruses such as ransomware. Having programs of this type installed can lead to financial and data loss.
How did Chthonic infiltrate my computer?
How to avoid installation of malware?
To prevent computer infection with Trojans or other malicious programs, browse the internet, download, install and update software with care. Do not open attachments or web links that are included in emails received from unknown or suspicious addresses, or if the emails are irrelevant. Keep installed software updated, however, use implemented, official tools that are provided by official software developers only. Additionally, all software should be downloaded using official websites and direct download links. Do not use third party downloaders (or installers), Peer-to-Peer networks, unofficial/dubious pages, or other similar sources. The same applies to software 'cracking' tools - do not trust them. Using them is a cyber crime and programs of this type often download and install viruses rather than activating any software. Furthermore, have reputable anti-virus or anti-spyware software installed and keep it enabled at all times. These tools detect and remove infections before they can do any damage. If you believe that your computer is already infected, we recommend running a scan with Malwarebytes for Windows to automatically eliminate infiltrated malware.
Hijacked website used to spread the Chthonic banking trojan (by presenting it as a Google Chrome update):
Screenshot of a fake Google Chrome update archive identified as a malicious file:
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:
- What is Chthonic?
- STEP 1. Manual removal of Chthonic malware.
- STEP 2. Check if your computer is clean.
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:
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:
Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:
Restart 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.
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.
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.
Video showing how to start Windows 10 in "Safe Mode with Networking":
Extract the downloaded archive and run the Autoruns.exe file.
In the Autoruns application, click "Options" at the top and uncheck the "Hide Empty Locations" and "Hide Windows Entries" options. After this procedure, click the "Refresh" icon.
Check 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".
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.
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.