How to avoid installation of GMERA

Also Known As: GMERA malware
Type: Mac Virus
Distribution: Low
Damage level: Severe

How to remove Gmera from Mac computers

What is Gmera?

GMERA (also known as Kassi trojan) is malicious software that disguises itself as Stockfolio, a legitimate trading app created for Mac users. Research shows that there are two variants of this malware, one detected as Trojan.MacOS.GMERA.A and the other as Trojan.MacOS.GMERA.B. Cyber criminals proliferate GMERA to steal various information and upload it to a website under their control. To avoid damage caused by this malware, remove GMERA immediately.

Gmera scam

The Trojan.MacOS.GMERA.A sample collects user information such as username, IP address, applications within the "Applications" folder and files in the "~/Documents" and "~/Desktop" directories. It also collects details such as OS installation date, graphic and/or display information, wireless network information, and can be used to obtain screenshots. It sends the details to a server controlled by cyber criminals. Stolen data/details might include sensitive information that could be misused to generate revenue in various ways. In any case, having personal information stolen can lead to problems with privacy, identity theft, financial loss, and other issues. The Trojan.MacOS.GMERA.B version collects details such as the victim's username and IP address, and stores a number of additional files. One operates as a 'persistence mechanism', which allows GMERA to stay active even after system restarts, reboots, log-offs, etc. If you believe that software such as GMERA hides behind the legitimate Stockfolio trading app and runs in the background after launch, take immediate action and remove the malware immediately.

Threat Summary:
Name GMERA malware
Threat Type Trojan, Information Stealer.
Detection Names ALYac (Trojan.MacOS.GMERA), Ikarus (PUA.OSX.Adware), Full List (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.
Distribution methods Malicious variant of legitimate Stockfolio app, infected email attachments, malicious online advertisements, social engineering, software 'cracks'.
Damage Stolen information, documents, screenshots, and other files.
Malware Removal (Mac)

To eliminate possible malware infections, scan your Mac with legitimate antivirus software. Our security researchers recommend using Combo Cleaner.
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There are many other 'information stealers' online. Some examples are Amadey, Krypton Stealer, and Stalk. Typically, cyber criminals proliferate malware of this type to steal personal, sensitive details, which are misused to generate revenue in various ways. Remove all malware immediately.

How did potentially unwanted applications install on my computer?

To distribute malicious programs, cyber criminals use spam campaigns/emails, untrustworthy file or software download sources, fake software updating tools, unofficial activation tools, and Trojans. They often try to infect computers through malicious files that they attach to emails. They send these emails to many people and hope that at least some open the attached file, which then installs ransomware or other malware. Typically, they send files such as Microsoft Office or PDF documents, JavaScript files, archives including ZIP, RAR, executable files (.exe), and so on. Malware is also spread using dubious file or software download channels. Typically, cyber criminals distribute malicious software through unofficial web pages, free file hosting or freeware download websites, Peer-to-Peer networks such as torrent clients, eMule, and so on. People who download files or programs through these sources risk downloading a malicious file that, if opened, will install malware. Typically, malicious files are disguised as regular, harmless. Systems can also be infected through fake updating tools. These infect computers by exploiting bugs/flaws of outdated software installed on a the computer, or by installing malicious software rather than updates. Unofficial activation tools ('cracks') supposedly activate paid software free of charge, however, cyber criminals often design them to install malicious software. Trojans are malicious programs that cause installation of additional malware. If a system is infected with a trojan, it will be probably also be infected with other malware (these programs usually cause chain infections).

How to avoid installation of potentially unwanted applications

Links or files that are attached to irrelevant emails should not be opened, especially when they are not expected and received from unknown, suspicious addresses. Files and software should be downloaded from official websites. No other sources/tools (mentioned above) can be trusted, since cyber criminals use them to proliferate malware. Installed programs must be updated using tools or implemented functions designed by official developers. The same applies to activation of licensed programs. It is illegal to use unofficial tools to activate software. Furthermore, they often distribute malicious software. To keep your computer safe from malware attacks, regularly scan the system with reputable-anti virus or anti-spyware software and keep it up-to-date. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them .

Download website of the legitimate Stockfolio app:

Stockfolio trading app official website

Instant automatic Mac 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 Mac malware. Download it by clicking the button below:
▼ DOWNLOAD Combo Cleaner for Mac By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.

Quick menu:

Video showing how to remove adware and browser hijackers from a Mac computer:

Potentially unwanted applications removal:

Remove potentially unwanted applications from your "Applications" folder:

mac browser hijacker removal from applications folder

Click the Finder icon. In the Finder window, select "Applications". In the applications folder, look for "MPlayerX", "NicePlayer", or other suspicious applications and drag them to the Trash. After removing the potentially unwanted application(s) that cause online ads, scan your Mac for any remaining unwanted components.

Remove gmera malware related files and folders:

Finder go to folder command

Click the Finder icon, from the menu bar. Choose Go, and click Go to Folder...

step1Check for adware-generated files in the /Library/LaunchAgents folder:

removing adware from launch agents folder step 1

In the Go to Folder... bar, type: /Library/LaunchAgents

removing adware from launch agents folder step 2
In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.

step2Check for adware generated files in the /Library/Application Support folder:

removing adware from application support folder step 1

In the Go to Folder... bar, type: /Library/Application Support

removing adware from application support folder step 2
In the “Application Support” folder, look for any recently-added suspicious folders. For example, “MplayerX” or “NicePlayer”, and move these folders to the Trash.

step3Check for adware-generated files in the ~/Library/LaunchAgents folder:

removing adware from ~launch agents folder step 1


In the Go to Folder bar, type: ~/Library/LaunchAgents

removing adware from ~launch agents folder step 2

In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.

step4Check for adware-generated files in the /Library/LaunchDaemons folder:

removing adware from launch daemons folder step 1
In the Go to Folder... bar, type: /Library/LaunchDaemons

removing adware from launch daemons folder step 2
In the “LaunchDaemons” folder, look for recently-added suspicious files. For example “com.aoudad.net-preferences.plist”, “com.myppes.net-preferences.plist”, "com.kuklorest.net-preferences.plist”, “com.avickUpd.plist”, etc., and move them to the Trash.

step 5 Scan your Mac with Combo Cleaner:

If you have followed all the steps in the correct order you Mac should be clean of infections. To be sure your system is not infected run a scan with Combo Cleaner Antivirus. Download it HERE. After downloading the file double click combocleaner.dmg installer, in the opened window drag and drop Combo Cleaner icon on top of the Applications icon. Now open your launchpad and click on the Combo Cleaner icon. Wait until Combo Cleaner updates it's virus definition database and click "Start Combo Scan" button.

scan-with-combo-cleaner-1

Combo Cleaner will scan your Mac for malware infections. If the antivirus scan displays "no threats found" - this means that you can continue with the removal guide, otherwise it's recommended to remove any found infections before continuing.

scan-with-combo-cleaner-2

After removing files and folders generated by the adware, continue to remove rogue extensions from your Internet browsers.

GMERA malware removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove gmera malware related Safari extensions:

safari browser preferences

Open Safari browser, from the menu bar, select "Safari" and click "Preferences...".

safari extensions window

In the preferences window, select "Extensions" and look for any recently-installed suspicious extensions. When located, click the "Uninstall" button next to it/them. Note that you can safely uninstall all extensions from your Safari browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Safari.

firefox browser iconRemove malicious plug-ins from Mozilla Firefox:

Remove gmera malware related Mozilla Firefox add-ons:

accessing mozilla firefox add-ons

Open your Mozilla Firefox browser. At the top right corner of the screen, click the "Open Menu" (three horizontal lines) button. From the opened menu, choose "Add-ons".

removing malicious add-ons from mozilla firefox

Choose the "Extensions" tab and look for any recently-installed suspicious add-ons. When located, click the "Remove" button next to it/them. Note that you can safely uninstall all extensions from your Mozilla Firefox browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Mozilla Firefox.

chrome-browser-iconRemove malicious extensions from Google Chrome:

Remove gmera malware related Google Chrome add-ons:

removing malicious google chrome extensions step 1

Open Google Chrome and click the "Chrome menu" (three horizontal lines) button located in the top-right corner of the browser window. From the drop-down menu, choose "More Tools" and select "Extensions".

removing malicious Google Chrome extensions step 2

In the "Extensions" window, look for any recently-installed suspicious add-ons. When located, click the "Trash" button next to it/them. Note that you can safely uninstall all extensions from your Google Chrome browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Google Chrome.

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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Removal Instructions in other languages
Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
GMERA malware QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of GMERA malware on your mobile device.
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