What is Android Calendar virus

Often mistaken by a separate virus, messages spamming Google Calendar events are actually related to a malicious/unwanted app that might be running on your Android device. Many victims complain that messages usually appear all over the calendar and attempt to persuade users into clicking on deceptive links. It is likely that after an unwanted application was installed, users experiencing spam at the moment granted access to certain features including permissions to modify Google Calendar events. The links may therefore lead to external websites designed to install malware and other types of infections. In fact, whatever information claimed by them (“severe virus detected”; “virus alert”; “clear your device”, etc.) is most likely fake and has nothing to do with reality. In order to fix this and prevent your calendar from being cluttered with such spam messages, it is important to find and remove an application causing the issue and reset the calendar to clean up unwanted events.

android calendar virus

How Android Calendar virus infected your computer

When it comes to infecting Android-based devices, many viruses and dubious features are promoted by unwanted/malicious apps. Such apps may be available even on legitimate app store platforms like Google Play, Samsung Galaxy Store, and so forth. Although these platforms host generally reliable software, there are yet some crooks managing to sneak-post their software and harm a decent number of users until it gets banned. In addition to this, it is also possible that you could download a suspicious app while following ads, which, in turn, lead to third-party websites and recommend to download some ostensibly useful software. Beware of them and download only trusted and time-tested applications, even on platforms like Google Play.

1. Download Anti-malware software

The best and most effective way to detect and remove malicious software is to use a specially-educated program like antivirus. High-quality and trusted anti-malware software wields constantly updating databases of malware to find it and neutralize quickly. Manual removal may not be as effective as using anti-malware software. The virus may show reluctance to the deletion or otherwise leave redundant traces. Our strong recommendation is Malwarebytes which has been providing thorough protection and removal of various threats across desktop and smartphone operating systems. You can download it from Google Play for Android and run malware removal for free.

Download Malwarebytes

2. Manual removal

If you do not have any of the above-listed applications installed, but still experience the same symptoms of Android Calendar virus, use these instructions to find the culprit. There are two traditional ways to do it. Both include checking the amount of battery and data resources demanded by the app. If there is a malicious program installed on your device, you will see excessively high resource demand by the malware. The steps listed below are similar on all Android-based smartphones.

Clear Android Calendar storage

  1. Open the Android system settings of your smartphone and go to Apps or Applications.
  2. Filter the results, by choosing All at the top, scroll down to Calendar Storage and tap on it.
  3. Tap the button Clear Data and the Android calendar storage is cleared.

Clear Google Calendar storage

If you use Google Calendar the instructions will be slightly different:

  1. Open the Settings app on your smartphone.
  2. Tap the Apps or Apps & notifications section, depending on your version of Android.
  3. Tap App info to view the list of all apps.
  4. Select Calendar. Tap Storage -> Clear data.
  5. If you see Calendar Storage in the list, do the same.

Methods to detect and stop malicious activity on Android

To check Battery resources:

  1. Find and open Settings on your device.
  2. Among the list of settings, choose Battery.
  3. Then tap on Battery Usage and check which application consumes the most (on top of the list).

To check data usage:

  1. Open Settings as we did above.
  2. Then choose something related to the network. Usually, it is called Connections.
  3. Find and tap on Data Usage or similar. On some devices, you will see the overall usage of traffic immediately. If not, you have to choose WiFi and Mobile data usage separately.

After identifying which app causes the most resource consumption, you can navigate to Settings > Applications, find and delete the application you found. Before doing so, it higly-recommended to remove Administrative Privileges for the malicious app:

  1. Go to Settings and find the Lock Screen and Security configuration.
  2. Most smartphones have Advanced or Other security settings to open.
  3. Then you should select something called Device Admin Apps.
  4. Once done, find the malicious application you found before and Deactivate it.

If you are still unable to delete the stubborn app, we advise you to do it in Safe Mode. It ensures your smartphone is launched using only in-built and native features, which helps work around restrictions imposed by malicious software. Of course, Android Calendar virus could block it as long as it has privileged rights, but still, give it a try if you have not done it yet. Here is how:

  1. Push and hold the Power button until it opens the list of reboot options.
  2. Then tap on and hold the Power off icon for a couple of seconds.
  3. A new message will pop asking to boot in Safe Mode.
  4. Confirm it and boot up your smartphone to affect the above steps in Safe Mode.

Once the deletion steps have been performed, you should no longer encounter the symptoms of the malicious Android Calendar virus. We recommend you scout the list of installed applications for other suspicious presence that you do not remember installing. There is a chance Android Calendar virus could install it upon.

3. Reset browser settings

After removing the application completely, it is important to clear your browser from malicious settings that could be installed by Android Calendar virus. You will have to perform a couple of steps comprising full restoration of browser settings. Besides infecting your device, the virus could also crawl into your browser to impose various changes. For instance, content like push notifications and other types of banners popping right on the screen might come from your browser. You can run a step-by-step cleaning for each browser segment (browsing history, push-notifications, permissions. etc.) to remove any malware traces. However, rolling browser configuration back to factory settings is better because it wipes out everything accumulated inside of a browser making sure no unwanted content dwells around your smartphone. We will show you both step-by-step clean-ups and full factory reset for the most popular browsers including Google Chrome, Mozilla Firefox, and Opera.

Google Chrome:

At first, let’s clear browsing data.

  1. Open Chrome browser and tap on Menu (3-dot icon in the top right corner).
  2. Then go to History and choose Clear browsing data….
  3. In the Advanced tab check all boxes and tap Clear data.

Then, we should disable push notifications.

  1. Open the same Menu and choose Settings.
  2. Then find and open Site Settings.
  3. Scroll down a bit until you find Notifications.
  4. Locate websites under Allowed, tap on them, and choose Clear & Reset.
  5. You can also disable the Notifications feature to prevent websites from asking for permission completely.

As mentioned, you can also reset your browser to default settings so that you have it from scratch. This means that all of the data stored within the browser will be deleted and rolled back to the default configuration. Since we are dealing with malicious behavior, it is good to perform such steps to make sure nothing harmful persists inside of your browser. It is more robust and quicker than running each step like above.

  1. Find and open Settings on your screen.
  2. Go to Applications and search for Chrome.
  3. Once found, tap on it and navigate to Storage > Manage Storage.
  4. Finally, tap on Clear All Data and wait until the process is done.

Mozilla Firefox:

The process looks almost identical, only slightly different in the names of the steps. Nevertheless, we will show you how it looks like on Firefox as well. To clear browsing data:

  1. Open Firefox and navigate to Menu likewise in Chrome.
  2. Choose History and tap on Clear private data.
  3. Select all of the entries and tap Clear Data.

To disable push notifications, follow these steps.

  1. Open Firefox again.
  2. Open Menu (either on top or below) and choose Settings.
  3. Then, go to Site permissions > Notification.
  4. Choose Blocked to not see notifications at all.

Up next is resetting browsing settings completely. To do this, simply follow all of the steps mentioned for Chrome above.

Opera:

Clearing browsing data in Opera looks like this:

  1. Open Opera and tap on the browser logo below on the right.
  2. Choose Settings, scroll down the list, and tap on Clear browsing data….
  3. Click Advanced, check all of the boxes listed, and choose Clear Data.

In order to disable notifications in Opera:

  1. Open Opera and tap on the browser logo below on the right.
  2. Choose Settings and scroll down until you find Site Settings.
  3. Click on it and choose Notifications.
  4. Tap Block to remove all Notification permission.

Performing full Opera reset equals to what we mentioned in instructions for Chrome.

4. Perform a Factory Reset

If you continue to stumble upon weird smartphone behavior and suspect the virus is not deleted, the best solution is resetting the device itself. This step will remove all the data stored on your system and roll all configuration settings back to the default state. In other words, you will reinstall your system from scratch. This will delete the virus and clean your smartphone from other unnecessary stuff in case you have not cleaned it for a very long time. Before doing so, make sure there is no important data to lose. It is also worth jotting the names of Google accounts and other services because most people tend to forget them throughout their usage. After performing the Factory Reset, you will have to log in to all of your user accounts once more. Now you are ready to dive into resetting your device.

  1. Open Settings and go to About phone.
  2. Right there, you will see information about Android and UI versions, your CPU, RAM, Memory, and more.
  3. Somewhere at the bottom, you will see the Reset button. Click on it and choose Factory Reset to erase all data and get your smartphone back to default settings.
  4. Agree with everything promoted and wait until your device completes the reset. It might take 30 minutes or close.
  5. Also, if you do not have the same location of settings and unable to find some of these steps, you can type Reset being in Settings and open it up.

In fact, you can find any setting you need using the search. It is our responsibility to provide detailed instructions so you have a full picture of the entire process.

Summary

We hope the instructions above were helpful, and you were able to eliminate all traces of Android Calendar virus from your Android device and secure it. The provided tutorial is general and based on common malware detection and removal techniques. If you have any questions or additional information on the topic, please, share your thoughts in the comment section below.

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