Remove Joker malware and cancel paid subscriptions The malware also steals all text messages from the victim’s phone as well as the whole address book and sends them to the C&C server.
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Since the Android virus contains a phone notification checker, it quickly observes incoming SMS and extracts the required confirmation code to purchase premium services on behalf of the victim. As a result, it opens premium offer URLs and injects JavaScript commands, waiting for the authorization SMS to arrive. The main task of Joker is to simulate victim’s clicks on advertisements. The malware continuously communicates with the C&C server to receive new tasks and report results.
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It is clear that the malware is created by professionals who want and know how to operate silently without being noticed (at least not until the victim notices payments in the bank account). The main part of Joker Android virus is coded to be as little, as functional, and as silent on the compromised device as possible.
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The Loader is set to download the DEX file and deobfuscates it for further use, proceeding to the core malware functionality. The world map of countries that the virus targets. The Android virus targets a total of 37 countries:Īustralia, Austria, Belgium, Brazil, China, Cyprus, Egypt, France, Germany, Ghana, Greece, Honduras, India, Indonesia, Ireland, Italy, Kuwait, Malaysia, Myanmar, Norway, Netherlands, Poland, Portugal, Qatar, Republic of Argentina, Singapore, Serbia, Slovenia, Spain, Sweden, Switzerland, Thailand, Turkey, Ukraine, United Arab Emirates, United States and United Kingdom. Interestingly, the vast majority of 24 apps have been configured to check whether the victim is from US or Canada, and terminate the malware in case of positive return. Most of the infected apps targeted Asian and European Union countries, although some of them were set to target victims worldwide. Listen to phone notifications and send the required components to the Core Joker malware component.īefore attacking the Android device, Joker virus checks whether the victim is using a SIM card from one of Mobile Country Codes (MCC).Decrypt and load second stage component which comes in a form of a DEX file.Communicate with Command & Control server (C&C).The loader is set to carry out the following tasks: The Joker Android virus lurks in advertisement frameworks used by the above-mentioned applications, delivering an initialization component (Loader) to the victim’s device. Details on how the Android virus operates Please use the free instructions at the end of this article. If you have been using one or several of these apps, make sure you remove Joker virus from your Android device completely. Since the discovery of malicious software, Google Play has removed these 24 apps from the store, however, users who installed the compromised apps MUST remove them from their devices manually to secure their privacy and bank accounts.Īndroid users who have one of the following apps on their devices must uninstall them IMMEDIATELY to remove Joker malware completely: Android OS remains the primary target to various malware variants.
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