Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.
Programs classified as Trojan-Downloader download and install new versions of malicious programs, including Trojans and AdWare, on victim computers. Once downloaded from the Internet, the programs are launched or included on a list of programs which will run automatically when the operating system boots up. Information about the names and locations of the programs which are downloaded are in the Trojan code, or are downloaded by the Trojan from an Internet resource (usually a web page). This type of malicious program is frequently used in the initial infection of visitors to websites which contain exploits.JS
This JS script downloads and runs other malware on the victim computer. The downloaded malware is most often ransomware that encrypts user data.
Geographical distribution of attacks by the Trojan-Downloader.JS.SLoad family
Top 10 countries with most attacked users (% of total attacks)
* Percentage among all unique Kaspersky Lab users worldwide attacked by this malware