contain harmful and misleading instructions. Mobile worms may be transmitted via text messages SMS or MMS and typically do not require user interaction for execution. Trojan: Unlike worms, a Trojan horse always requires user interaction to be activated. This kind of virus is usually inserted into seemingly attractive and non-malicious executable files or applications that are downloaded to the device and executed by the user. Once activated, the malware can cause serious damage by infecting and deactivating other applications or the phone itself, rendering it paralyzed after a certain period of time or a certain number of operations. Usurpation data (spyware) synchronizes with calendars, email accounts, notes, and any other source of information before it is sent to a remote server. Spyware: This malware poses a threat to mobile devices by collecting, using, and spreading a user's personal or sensitive information without the user's consent or knowledge. It is mostly classified into four categories: system monitors, trojans, adware, and tracking cookies. Backdoor: Covert method of bypassing security restrictions to gain unauthorized access to a computer system. In simpler words, a backdoor is a piece of code that allows others to go in and out of a system without being detected. Dropper: A malware designed to install other programs on a device, unbeknownst to the user. These could include other malicious programs or benign applications that the attacker is interested in spreading (often for financial gain in a [malvertising] campaign). Notable mobile malicious programs Autolycos: This is the latest malware family to be discovered that subscribes users against their will and without their knowledge to premium services. Autolycos was identified in July 2022 by malware experts at cybersecurity firm Evina. Joker Malware: This malware infects mobile phones running on Android OS and was first identified in June 2017. When a phone is infected, usually information is stolen by malware makers. Few users have reported of unwanted online subscriptions which is because malware is created to steal otp, make online transactions, etc. Cabir: This malware infects mobile phones running on Symbian OS and was first identified in June 2004. When a phone is infected, the message 'Caribe' is displayed on the phone's screen and is displayed every time the phone is turned on. The worm then attempts to spread to other phones in the area using wireless Bluetooth signals, although the recipient has to confirm this manually. Duts: This parasitic file infector