Trojan:JS/Medfos.A is a malicious JavaScript that redirects search queries when you use search engines. It is installed as a malicious Mozilla Firefox extension.

Windows Defender Antivirus detects and removes this threat. 

This threat can redirect your search engine queries when you use the Mozilla Firefox web browser.  

It can be installed by Trojan:Win32/Medfos.B.

Windows Defender detects and removes this threat.

This threat can perform a number of actions of a malicious hacker's choice on your PC.

Find out ways that malware can get on your PC.

Trojan:Win32/Bube.G is a Trojan that lowers security settings stored in the registry, attempts to download programs from a remote Web site and disables features in the Windows Security Center.

TrojanDropper:Win32/Hupigon is component of Win32/Hupigon. TrojanDropper:Win32/Hupigon copies itself to the system folder and runs itself from there.  It then drops the other Hupigon components, registers the primary Backdoor component as a service, and injects the stealth / password stealer components into other processes using CreateRemoteThread. For more information, see the encyclopedia entry for Win32/Hupigon

TrojanDownloader:Win32/Zirit.A is a trojan that advertises rogue security software suites. It also downloads these packages, and misleads the user into installing them by continuously presenting the user with fake security alerts.

Windows Defender detects and removes this threat.

This ransomware encrypts and deletes important files on your PC. It might also ask you to pay money to a malicious hacker.

Windows 10 protects you from ransomware. Read more:

Windows 10 Creators Update provides next-gen ransomware protection

Our ransomware page has more information on this type of threat.

Find out ways that malware can get on your PC.  

 

 Trojan:Java/Classloader.I loads another malware. It might arrive in your computer if you visit a compromised or malicious website. If you have Java installed in your computer, and the version you have installed is vulnerable to certain exploits, your computer might get infected.

To help make sure that your computer can no longer be infected by this trojan, make sure you update Java to the latest secure version and uninstall older versions.

To remove this trojan from your cache, where it might be stored, it might be necessary for you to delete the contents of the Temporary Internet Files folder.

TrojanDownloader:Win32/Clagger.C!CME-934 is a trojan downloader that downloads a particular file from a specific URL and runs that file. The trojan registers itself as an authorized application with the Windows firewall in order to access the Internet without interference from the firewall.

TrojanDownloader:Win32/Clagger.C is a trojan downloader that downloads a particular file from a specific URL and runs that file. The trojan registers itself as an authorized application with the Windows firewall in order to access the Internet without interference from the firewall.

Exploit:Win32/Siveras.A is detection for specific known malware used to exploit a vulnerability in the Domain Name System (DNS) Server Service. This vulnerability impacts Microsoft Windows 2000 Server Service Pack 4, Windows Server 2003 Service Pack 1, and Windows Server 2003 Service Pack 2. For vulnerability details, workarounds, and patch information, please refer to the Microsoft Security Advisory (935964).

TrojanSpy:Win32/VBStat.E collects details about the system it was executed on and sends those details to a remote IP address hosted in the Netherlands.

Windows Defender detects and removes this threat.

This is a generic detection for specially formed IFrame tags pointing to webpages that have malicious content.

Find out ways that malware can get on your PC.

TrojanDropper:Win32/Conhook.A is a Trojan that drops and installs TrojanDownloader:Win32/Conhook.A.

 

TrojanDownloader:Win32/Conhook.A attempts to download content from a remote Web site. TrojanDownloader:Win32/Conhook.A injects its code into running processes which could, depending on configuration, allow the Trojan to bypass permission-based firewalls in order to gain Internet access.

TrojanDownloader:Win32/Swizzor.gen is a generic detection for a Trojan that downloads files from remote Web sites, delivers pop-up and contextual advertisements and, depending on the variant, may add Web browser bookmarks, toolbars and search buttons in Internet Explorer.

TrojanDownloader:JS/Agent.GG is a JavaScript Trojan that downloads malicious programs. JS/Agent.GG uses obfuscation techniques, sometimes in multiple layers, in order to hide its functionality.

Trojan:Win32/Vundo.gen!C is a generic detection for a multi-component family of programs that deliver 'out of context' pop-up advertisements to the computer on which they are installed and may download and execute arbitrary files. Win32/Vundo.gen!C may exist on a computer as a dynamic link library (DLL) or as an executable. Some variants function as Browser Helper Objects (BHOs). It may also use defensive methods to make itself difficult to remove from the affected machine.

Trojan:Win32.Busky.EC generates 'out of context' pop-up advertisements. It may connect to a remote web server to download updates or other files.