FacebookTwitterLinkedIn

How to remove the SysJoker malware from your operating system

Also Known As: SysJoker virus
Type: Mac Virus
Damage level: Severe

What is SysJoker?

SysJoker is a backdoor-type malicious program. It operates by injecting compromised systems with other malware. SysJoker is also a cross-platform program; hence, in addition to macOS, it also targets Windows and Linux operating systems.

SysJoker malware detections on VirusTotal

SysJoker overview

At the time of writing, SysJoker's capabilities were the same regardless of the infected platform. As mentioned in the introduction, this malicious program is designed to cause chain infections (i.e., download/install additional malware).

To expand upon the most common malicious software, "trojan" is a term that defines an incredibly varied type of malware. Trojans may be able to exfiltrate content (files and data) from the system, extract information from browsers and other installed applications, record keystrokes (keylogging), record/livestream the desktop or audio/video via microphones and cameras, enable remote control over devices (RATs - Remote Access Trojans), and so on.

Ransomware encrypts data and demands ransoms for the decryption (screenlocker types may not encrypt files and instead just lock the screen for the same purpose). Cryptominers are malicious programs that abuse system resources (potentially to the point of system failure) to generate cryptocurrency.

To summarize, infections with malware like SysJoker, can lead to data loss, hardware damage, serious privacy issues, financial losses, and identity theft.

Threat Summary:
Name SysJoker virus
Threat Type Mac malware, Mac virus, Trojan, password-stealing virus, spyware.
Detection Names Avast (MacOS:Joker-A [Trj]), Combo Cleaner (Trojan.GenericKD.47868192), ESET-NOD32 (OSX/SysJoker.A), Kaspersky (HEUR:Backdoor.OSX.SysJoker.gen), Full List Of Detections (VirusTotal)
Symptoms Trojans-type malware is 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, fake Adobe Flash Player installers, malicious online advertisements, social engineering, software 'cracks'.
Damage Data and financial losses, loss of access to personal accounts, problems with browsing safety, online privacy issues.
Malware Removal (Mac)

To eliminate possible malware infections, scan your Mac with legitimate antivirus software. Our security researchers recommend using Combo Cleaner.
▼ Download Combo Cleaner for Mac
To use full-featured product, you have to purchase a license for Combo Cleaner. Limited seven days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.

Mac malware examples

macOS.Macma and OceanLotus are a couple examples of programs similar to SysJoker. Theoretically, backdoor malware can infect devices with any type of malware. However, they may have certain limitations or be designed to inject specific programs into systems. UpdateAgentSilver SparrowTarmac, and OSAMiner are a few other Mac-specific malicious programs.

How did SysJoker infiltrate my computer?

Malware is spread using phishing and social engineering methods. To elaborate, spam campaigns are commonly used for this purpose. Spam emails can have malicious files attached to and/or linked inside them. Virulent files can be executables, archives, PDF and Microsoft Office documents, JavaScript, etc. Malicious software download/installation is jumpstarted - once these files are opened.

Malware is also proliferated through untrustworthy download channels, e.g., unofficial and free file-hosting websites, Peer-to-Peer (P2P) sharing networks, and other third-party downloaders.

Illegal activation ("cracking") tools and fake updates are used in distribution as well. "Cracks" can cause infections instead of activating licensed products. Fraudulent updaters infect systems by abusing outdated software weaknesses and/or by installing malicious programs.

How to avoid installation of malware?

The attachments and links found in suspicious and irrelevant emails - must not be opened, as they are potential sources of infection. It is advised to always download from official and verified sources. Additionally, all programs must be activated and updated with tools/functions provided by legitimate developers.

It is paramount to have a reputable anti-virus installed and kept updated. This software has to be used to run regular system scans and to remove detected threats. If your computer is already infected with malware, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.

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 seven days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.

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 sysjoker virus 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.

SysJoker virus removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove sysjoker virus 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 sysjoker virus 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 sysjoker virus 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.

Frequently Asked Questions (FAQ)

My computer is infected with SysJoker malware, should I format my storage device to get rid of it?

No, such drastic measures are not required for SysJoker's removal.

What are the biggest issues that SysJoker malware can cause?

What danger a piece of malicious software poses - depends on its features and the cyber criminals' modus operandi. SysJoker is designed to cause chain infections; hence, its infections can lead to diminished system performance, data loss, hardware damage, serious privacy issues, financial losses, and identity theft.

What is the purpose of SysJoker malware?

In nearly all cases, malware only aims to generate revenue at its victims' expense. Other potential reasons for the release of malicious programs include: political/geopolitical motivations, personal reasons (e.g., vendettas against certain individuals, etc.), disruption of specific processes (e.g., websites, services, companies, organizations, etc.), or simply the cyber criminals' amusement.

How did SysJoker malware infiltrate my computer?

Malicious software is distributed using phishing and social engineering. It is spread via drive-by (deceptive and stealthy) downloads, online scams, unofficial and freeware download sites, Peer-to-Peer sharing networks (Torrent clients, eMule, etc.), spam mail, illegal program activation tools ("cracks"), fake updates, and so forth. Some harmful programs are capable of self-proliferating through local networks and removable storage devices (e.g., external hard drives, USB flash drives, and similar).

Will Combo Cleaner protect me from malware?

Yes, Combo Cleaner can detect and eliminate most of the known malware infections. However, performing a full system scan is crucial - since sophisticated malicious programs tend to hide deep within systems.

▼ Show Discussion

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.

Our malware removal guides are free. However, if you want to support us you can send us a donation.

About PCrisk

PCrisk logo

PCrisk is a cyber security portal, informing Internet users about the latest digital threats. Our content is provided by security experts and professional malware researchers. Read more about us.

Malware activity

Global malware activity level today:

Medium threat activity

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

QR Code
SysJoker virus QR code
Scan this QR code to have an easy access removal guide of SysJoker virus on your mobile device.
We Recommend:

Get rid of Mac malware infections today:

▼ REMOVE IT NOW
Download Combo Cleaner for Mac

Platform: macOS

Editors' Rating for Combo Cleaner:
Editors ratingOutstanding!

[Back to Top]

To use full-featured product, you have to purchase a license for Combo Cleaner. Limited seven days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.