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How to remove WARNING! MAC OS Is Infected from Mac?

What is WARNING! MAC OS Is Infected?

'WARNING! MAC OS Is Infected' is a fake error similar to Apple Security Alert, Apple Support Center - Attention!!, Apple Warning Alert, and many others. This error is displayed by a malicious website that users often visit inadvertently - they are redirected by various potentially unwanted programs (PUPs). These programs also deliver various 'malvertising' ads (pop-ups, banners, coupons, etc.), record information (mostly, about web browsing habits), and misuse system resources.

This error states that the system has been infected and that the malware must be removed and system repaired immediately. Users are advised that they must not hesitate to call Apple technical support via the telephone number ('1-844-658-5859') provided. Certified technicians then supposedly guide users through the malware removal process. Bear in mind, however, that 'WARNING! MAC OS Is Infected' is a scam. This error is fake and has nothing to do with Apple. In fact, cyber criminals claim to be certified technicians and attempt to monetize their services that are not needed. In addition, these people often trick users into granting remote access to their computers. Once connected, cyber criminals stealthily install malware and/or change system settings. Then they claim to detect additional errors and offer further help for an additional fee. Therefore, we strongly advise you to ignore 'WARNING! MAC OS Is Infected' and to never call the aforementioned telephone number. This error can be removed by closing the web browsing or rebooting the system. Be aware that some malicious websites and PUPs mine cryptocurrency or run other unwanted processes in the background. They misuse system resources without users' consent, thereby significantly diminishing overall computer performance. Potentially unwanted programs are also known to gather various information that might contain personal details. This data is sold to third parties. Furthermore, PUPs often deliver malicious ads using various tools that enable placement of third party graphical content on any site. Therefore, the ads usually conceal underlying content, thereby diminishing the browsing experience. Malicious ads may also lead to rogue websites and/or execute scripts that download and install malware. Therefore, even accidental clicks can result in high-risk computer infections. For these reasons, we advise you to uninstall all potentially unwanted programs immediately.

Threat Summary:
Name'WARNING! MAC OS Is Infected' virus
Threat TypeMac malware, Mac virus
SymptomsYour Mac became slower than normal, you see unwanted pop-up ads, you get redirected to shady websites.
Distribution methodsDeceptive pop-up ads, free software installers (bundling), fake flash player installers, torrent file downloads.
DamageInternet browsing tracking (potential privacy issues), displaying of unwanted ads, redirects to shady websites, loss of private information.
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 three days free trial available.

As mentioned above, 'WARNING! MAC OS Is Infected' shares many similarities with dozens of other fake errors. Each and each one claims that the system is damaged , however, these false claims are merely attempts to extort money from unsuspecting users. Potentially unwanted programs are also very similar. By offering various 'useful features', PUPs trick users into believing that these programs are legitimate and useful, however, that all potentially unwanted programs only generate revenue for the developers. Therefore, only very few give real value for regular users. Most merely promote rogue websites (unwanted redirects), deliver malicious ads, gather information, and misuse system resources. These programs pose a direct threat to your privacy and Internet browsing safety.

How did potentially unwanted programs install on my computer?

Research shows that some PUPs have official download websites, however, most are distributed using a deceptive marketing method called 'bundling', and via the aforementioned malicious ads. Therefore, users often install PUPs inadvertently or PUPs stealthily infiltrate their systems without permission. Bundling is stealth installation of third party software together with regular apps. Developers hide bundled programs within the 'Custom/Advanced' settings or other sections of the download/installation processes. Many users are careless during download and installation - they rush and skip steps. In addition, many users click various ads. This behavior often leads to inadvertent installation of potentially unwanted programs.

How to avoid installation of potentially unwanted applications?

The key to computer safety is caution. Therefore, pay close attention when downloading/installing software and browsing the Internet in general. If possible, select the 'Custom/Advanced' settings, carefully analyze each window of the download/installation dialogues, and decline offers to download/install third party programs. Bear in mind that third party download/installation tools are monetized by promoting dubious programs (the 'bundling' method). Therefore, we recommend that you avoid using such tools - your software should be downloaded from official sources only, using a direct download link. Most malicious ads appear legitimate, as developers invest a great deal of time and money into their design, however, these ads are distinguishable for their redirects - most lead to survey, adult dating, pornography, and other similar sites. Therefore, if you encounter this type of ad or website, immediately remove all suspicious apps and browser plug-ins.

Text presented within 'WARNING! MAC OS Is Infected' pop-up scam:

WARNING!
MAC OS is infected with Viruses and other malicious applications. Viruses must be removed and system damage repaired. It is necessary to Call Apple Support 1-844-658-5859 and follow Virus removal procedure immediately, please proceed.
** If you leave this site your Mac OS will remain damaged and vulnerable **

Appearance of 'WARNING! MAC OS Is Infected' scam (GIF):

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 MacBy 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:

  • STEP 1. Remove PUP related files and folders from OSX.
  • STEP 2. Remove rogue extensions from Safari.
  • STEP 3. Remove rogue add-ons from Google Chrome.
  • STEP 4. Remove potentially unwanted plug-ins from Mozilla Firefox.

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

Potentially unwanted programs removal:

Remove PUP-related potentially unwanted applications from your '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.

Combo Cleaner checks if your computer is infected with malware. To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.

Remove 'warning! mac os is infected' virus related files and folders:

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

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

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


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.

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

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


In the “Application Support” folder, look for any recently-added suspicious folders. For example, “MplayerX” or “NicePlayer”, and move these folders to the Trash.

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


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

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.

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


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


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.

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.

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.

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

'WARNING! MAC OS Is Infected' virus removal from Internet browsers:

Remove malicious extensions from Safari:

Remove 'warning! mac os is infected' virus related Safari extensions:

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

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.

Remove malicious plug-ins from Mozilla Firefox:

Remove 'warning! mac os is infected' virus related 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'.

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.

Remove malicious extensions from Google Chrome:

Remove 'warning! mac os is infected' virus related Google Chrome add-ons:

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'.

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.

You are viewing the Status LED and Device Modes for the Photon. To view the documentation for other devices, use the blue device selector below the Particle logo on the left side of the page.

Standard Modes

These modes are the typical behaviors you will see from your device on a regular basis. They are the light patterns of a healthy device.

Here's the typical pattern of after power up.

Connected

When it is breathing cyan, your device is happily connected to the Internet. When it is in this mode, you can call functions and flash code.

OTA Firmware Update

If your device is blinking magenta (red and blue at the same time), it is currently loading an app or updating its firmware. This state is triggered by a firmware update or by flashing code from the Web IDE, CLI, or Workbench. You might see this mode when you connect your device to the cloud for the first time.

Note that, if you enter this mode by holding SETUP on boot, blinking magenta indicates that letting go of the SETUP button will enter safe mode to connect to the cloud and not run application firmware.

Looking For Internet

If your device is blinking green, it is trying to connect to Wi-Fi.

More information

Connecting to the Cloud

When the device is in the process of connecting to the cloud, it will rapidly blink cyan. You often see this mode when you first connect your device to a network, after it has just blinked green.

Listening Mode

When your device is in Listening Mode, it is waiting for your input to connect to Wi-Fi. Your device needs to be in Listening Mode in order to begin connecting with the Mobile App or over USB.

To put your device in Listening Mode, hold the SETUP button for three seconds, until the RGB LED begins blinking blue.

You can also use particle usb start-listening to enter listening mode.

Wi-Fi Network Reset

To erase the stored Wi-Fi networks on your device, hold the SETUP button blinks dark blue, then continue to hold it down for about ten seconds longer, until the RGB LED blinks blue rapidly, then release.

Wi-Fi Off

If your device is breathing white, the Wi-Fi module is off. You might see this mode if:

  • You have set your module to MANUAL or SEMI_AUTOMATIC in your user firmware
  • You have called Cellular.off() or WiFi.off() in your user firmware

Safe Mode

Safe mode, breathing magenta (red and blue at the same time), connects the device to the cloud, but does not run any application firmware. This mode is one of the most useful fordevelopment or for troubleshooting. If something goes wrong with the appyou loaded onto your device, you can set your device to Safe Mode. Thisruns the Device OS but doesn't execute any application code, which can be useful if the application code contains bugs that stop the device from connecting to the cloud.

The device indicates that it is in Safe Mode with the LED breathing magenta.

To put your device in Safe Mode:

  1. Hold down BOTH buttons
  2. Release only the RESET button, while holding down the SETUP button.
  3. Wait for the LED to start blinking magenta
  4. Release the SETUP button

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Before entering safe mode, the device will proceed through the normal steps of connecting to the cloud; blinking green, blinking cyan, and fast blinking cyan. If you're unable to connect to the cloud, you won't actually end up with breathing magenta, but execution of application firmware will still be blocked - so you are in a 'sort-of safe mode' (e.g. to enter 'Safe Listening Mode').

The device will itself automatically enter safe mode if there is no application code flashed to the device or when the application is not valid.

You can also use the particle usb safe-mode command to enter safe mode.

DFU Mode (Device Firmware Upgrade)

If you wish to program your device with a custom firmware via USB, you'll need to use this mode. This mode triggers the on-board bootloader that accepts firmware binary files via dfu-util

Installation tutorial can be found here.

And a usage guide here.

To enter DFU Mode:

  1. Hold down BOTH buttons
  2. Release only the RESET button, while holding down the SETUP button.
  3. Wait for the LED to start flashing yellow (it will flash magenta first)
  4. Release the SETUP button

The device now is in the DFU mode.

DFU mode requires device drivers under Windows. These should automatically be installed by the Particle CLI installer, but if you think you are having driver issues, there are additional DFU troubleshooting tips here.

Some users have reported issues with dfu-util on a USB3 ports (typically the blue ones). Use a USB2 port if the USB3 port doesn't work.

You can also use the particle usb dfu command to enter DFU mode.

Firmware Reset

Firmware reset is not available on the device, but not to worry! If you are experiencing problems with your application firmware, you can use Safe Mode to recover.

The Particle CLI can also restore the default Tinker firmware by entering DFU mode by holding down both the RESET and SETUP buttons, releasing RESET and continuing to hold down SETUP until it blinks yellow then entering the command:

Troubleshooting Modes

These modes let you know about more atypical issues your device might be exhibiting. Use this section to troubleshoot strange colors you might see from your device.

Wi-Fi Module Not Connected

If the Wi-Fi module is on but not connected to a network, your device will be breathing blue. Note that this will be dark blue and not cyan.

Cloud Not Connected

When your device is connected to Wi-Fi but not to the cloud, it will be breathing green.

More information

Rainbows/Nyan

Using the Signal option in the Web IDE, or the particle cloud nyan CLI command, you can have a device's status LED display a rainbow pattern. This is handy if you have multiple devices nearby and are not sure which one is which.

Red Blink Basic Errors

Blinking red indicates various errors.

While connecting to the Cloud, the RGB LED will be blinking cyan followed by:

  • 1 orange blink: Decryption error.
  • 2 orange blinks: Could not reach the internet.
  • 3 orange blinks: Connected to the internet, but could not reach the Particle Device Cloud. This sometimes is seen as yellow or red and indicates bad server keys.
  • 1 magenta blink: Authentication error.
  • 1 red blink: Generic handshake error. The device could have the wrong keys or has just encountered a generic error in the handshake process.

Repair instructions

Red Flash SOS

Is your device blinking red? Oh no!

Pls

A pattern of more than 10 red blinks is caused by the firmware crashing. The pattern is 3 short blinks, 3 long blinks, 3 short blinks (SOS pattern), followed by a number of blinks that depend on the error, then the SOS pattern again.

Enter safe mode, tweak your firmware and try again!

You can also reset your device to a known state by following these instructions.

There are a number of other red blink codes that may be expressed after the SOS blinks:

  1. Hard fault
  2. Non-maskable interrupt fault
  3. Memory Manager fault
  4. Bus fault
  5. Usage fault
  6. Invalid length
  7. Exit
  8. Out of heap memory
  9. SPI over-run
  10. Assertion failure
  11. Invalid case
  12. Pure virtual call
  13. Stack overflow
  14. Heap error

The two most common ones are:

Hard Fault (1 blink between 2 SOS patterns)

Some causes of hard fault include:

  • Using an invalid pointer.
  • Memory corruption caused by freeing memory twice, overwriting the end of a block of memory, etc.
  • Making Wire (I2C) calls without calling Wire.begin().

Out of heap memory (8 blinks between 2 SOS patterns)

If your device crashes repeatedly with an SOS code, first try recovering with Safe Mode and flashing Tinker with the CLI to see if it was something recently added in your user application.

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If it's not possible to enter Safe Mode, your Device OS may be corrupted. Use the Device Doctor feature of the CLI to put your device into a healthy state.

Some tips for reducing the memory used by your firmware can be found here.

Stack overflow (13 blinks between 2 SOS patterns)

Stack overflow occurs when you try to store too much data on the stack. The size is quite limited, and storing large temporary objects on the stack can cause problems.

  • Main loop thread: 6144 bytes
  • Software timer callbacks: 1024 bytes

Heap error (14 blinks between 2 SOS patterns)

SOS+14 signifies:

  • Semaphore lock timeout
  • Since 0.8.0 60 seconds expired while trying to acquire a semaphore lock, likely due to dynamic memory allocation
  • Since 1.2.0 Other heap-related error, such as allocating memory from an ISR

Prior to 1.2.0, attempting to allocate memory from an interrupt service routine would sometimes work, and sometimes corrupt the heap causing the software to crash sometime later, while doing something completely different. Since this is very difficult to debug, now a SOS+14 is thrown immediately.

Some locations that are interrupt service routines:

  • ISRs attached using attachInterrupt
  • System event button handlers (just button_status, button_click, and button_final_click handlers, not all system events)
  • SPI transaction callbacks
  • SparkIntervalTimer library timer callbacks

Things you should not do from an ISR:

  • Any memory allocation or free: new, delete, malloc, free, strdup, etc.
  • Any Particle class function like Particle.publish, Particle.subscribe, etc.
  • Most API functions, with the exception of pinSetFast, pinResetFast, and analogRead.
  • delay or other functions that block
  • Log.info, Log.error, etc.
  • sprintf, Serial.printlnf, etc. with a %f (float) value.

Solid colors

Solid colors are rare. There only expected situation is:

  • Solid magenta if you are loading code in ymodem serial mode.

In most cases, solid colors are the side effect of a bug. If code crashes or infinitely loops with interrupts disabled, it's possible that the LED animation will stop. The color of the LED is the color it last was before failure. So for example, it could be solid cyan if it was previously breathing cyan, or solid red if it was trying to output an SOS pattern.

No status LED

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If you power up your device and the status LED never comes on and the small blue led next to pin D7 is on dimly, you have a missing or corrupted bootloader.

This can be corrected using a JTAG/SWD programmer if you have one. Otherwise, you should contact support.