![]() Both types of Trojan can be remotely updated in secret by the programmers responsible, for example so that virus scanners cannot detect them with new definitions. Droppers themselves already contain the other malicious components in the program package. Droppers are therefore similar to downloader Trojans, the difference being that downloaders need a network resource to pull malware from the network. Instead, it brings other malware with it, for example the banking Trojan Trickbot and the ransomware Ryuk. One of the best-known dropper Trojans is the Emotet malware, which has now been rendered harmless but which, in contrast to a backdoor Trojan, cannot execute any code on the PC itself. Often their main purpose is to prevent malicious programs being detected, in order to extend the period in which the programs can run on an infected computer. Rootkits are designed to conceal certain objects or activities in your system. ExploitĮxploits are programs that contain data or code that take advantage of a vulnerability within an application on your computer. Furthermore, backdoors can allow code and commands to be executed on your device or monitor your web traffic. Without your knowledge, your computer becomes part of a zombie network that is used for attacks. A backdoor is often used to set up botnets. This is because they can either load all sorts of malware onto your system in their role as a gateway, or at least ensure that your computer is vulnerable to attack. They are one of the simplest but potentially most dangerous types of Trojan. Unlike computer viruses and worms, Trojans are not able to self-replicate.
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