![]() To prevent malware from being automatically downloaded and installed, disable the "auto-run" and "auto-download" features on your computer.įor more information about this FileZilla issue, please review the following forums on the Reddit and FileZilla Project websites.When downloading applications and software, you should always save them to a file on your computer and run your anti-virus application against them to ensure they are free of any malware.If you are using FileZilla, do not click on the pop-up or allow the pop-up to automatically install the "updates" for your FileZilla application.If you have vendors who use FileZilla, request they discontinue use of that application and move to the University's secure VPN.If you must use an application for file transfer for your servers or systems, please work with UMIT to develop a secure and safe procedure for your applications and your data. UMIT recommends that you use Box, Google Drive, or OneDrive.If you need to transfer protected information, please use the University's virtual private network (VPN) or contact UMIT for information and assistance.To protect yourself against this malware, it is best not to use FileZilla.Many of these may not be detected by anti-virus software. The wrapper contains malware such as fusioncore, installcore, Eldorado, PUP, and PUA. The download from this link delivers a malicious bundle installation wrapper, a program used to execute one or more installation program. How does the malware get installed on your computer?Ī pop-up link will alert the user that their FileZilla application is out-of-date and will direct the user to the website for. Notably, StealZilla does not allow itself to be updated.Įmsisoft’s Malware Analysis team will continue to follow StealZilla as it evolves, and will keep readers posted if any significant modifications to this threat occur.Please be advised that FileZilla – a cross-platform graphical FTP, SFTP, and FTPS file management tool for Windows, Linux, Mac OS X, as well as other operating systems – has been flagged for bundling malware in to the installation process. With any application, regular updates are also a key component of comprehensive security. If you use anything else, you are placing yourself at risk. When downloading any open source application it is important to use only official or officially certified websites. (If it thinks it's being analyzed by a security researcher, it acts innocent and doesn't install Spigot.) This is definite shady behavior, so we will continue to block this installer. The 3 known domains are:, , and but the WHOIS info on these domains is anonymous. However, we are still blocking the FileZilla installer, which installs the Spigot adware and displays analysis avoidance behavior. It has been discovered that the program sends stolen FTP credentials to a server in Germany (IP 144.76.120.24) but the domains linked to this IP are hosted by, a Russian registrar long associated with hacking. The is a very subtle method, but Emsisoft Anti-Malware actually recognizes it with its Behavior Blocker.Īs yet, the identities of those behind StealZilla are unknown. ![]() This information is sent only once, but once it is the hackers can then bypass your firewall and perform any number of malicious activities to or with your computer. StealZilla actually contains a hardcoded FTP stealer which sends user FTP connection information to the hackers behind the attack. There are a few dead giveaways going on in the background, however. Upon trying to download the latest version of the filezilla client for windows, I get the following warning:-WARNING: ProxyAV has detected a virus/PUS in this file File has been dropped. Essentially, StealZilla works because it works – and to the average user nothing appears to be wrong. On top of this, StealZilla is fully functional and the application is only slightly smaller than the 6.8 MB FileZilla.exe. To begin, the third-party GUI download sites (right) are almost identical to the official FileZilla one (left). At a glance, StealZilla differs very little from FileZilla. Filezilla was detected as malware (specifically trojans) by multiple virus scanners, including Kaspersky and Microsoft defender. How StealZilla WorksĪs an open-source application, FileZilla has long been vulnerable to fraudulent replication, however StealZilla is currently the largest and most successful attack to date. If you require assistance with comparison, please don’t hesitate to contact Emsisoft Support.
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