Backdoor:Win32/Berbew.AD is a Trojan that installs silently on your computer. It can capture and send personal information to a Web site. It can also download files from Web sites and run them on your computer. There are no readily apparent indications that your computer is infected with this Trojan.

Exploit:JS/Blacole.AD is a malicious JavaScript that attempts to exploit several vulnerabilities in Adobe Acrobat and Reader. If the exploit is successful in compromising a vulnerable host, it could result in downloading and executing other malware. Exploit:JS/Blacole.AD is a component of an exploit kit that is distributed as the "Blackhole exploit pack".

Worm:Win32/Nuqel.AD is a worm - a self-propagating program that can spread itself from one computer to another. Worms may spread themselves via a variety of different channels in order to compromise new machines. Commonly, worms may spread directly by copying themselves to removable or network drives, or by attempting to exploit particular vulnerabilities on targeted machines. Worms also often attempt to spread via platforms that require user interaction in order to run. They may send themselves as an attachment to an email or an instant message, or send a link to a copy of themselves in the body of a message. In these cases the message needs to be convincing enough to encourage the victim to click on the link or attachment and run or download a copy of the worm.

Win32/Bagle.AD@mm is a minor variant of Win32/Bagle.AA@mm. It is a mass-mailing worm that targets computers running certain versions of Microsoft Windows. The worm sends itself as an attachment to e-mail addresses that it finds on the infected computer. It also spreads through file-sharing networks. The worm opens a backdoor and monitors a TCP port for instructions from remote attackers.

VirTool:Win32/VBInject.gen!AD is a generic detection for malicious files that are obfuscated using particular techniques to protect them from detection or analysis.

VirTool:Win32/VBInject.AD is a generic detection for malicious files that are obfuscated using particular techniques to protect them from detection or analysis.

Trojan:Win32/Qhosts.AD is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.

Win32/Mydoom.AD@mm is a mass-mailing worm that sends itself to e-mail addresses it finds on the infected computer. 

Microsoft Defender Antivirus detects and removes this threat.

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

Learn more about this type of threat: Invisible resource thieves: The increasing threat of cryptocurrency miners

PWS:Win32/Zbot.gen!AD is a password stealer and remote access trojan.

Virus:Win32/Ramnit.AD is a detection for files infected by variants of the Win32/Ramnit malware family. This malware drops and loads other malware, which may be detected as Trojan:Win32/Ramnit.D.

Trojan:Win64/Sirefef.AD is a component of Win64/Sirefef - a multi-component family of malware that moderates your Internet experience by changing search results and generating pay-per-click advertising revenue for its controllers. The family consists of multiple parts that perform different functions, such as downloading updates and additional components, hiding existing components, or performing a payload.

Trojan:JS/Psyme.AD exploits publicly published vulnerabilities via the Web browser Internet Explorer to execute malicious JavaScript. This malicious JavaScript is commonly used to download and execute other malware onto the system. 

VirTool:Win32/CeeInject.AD is a generic detection for malicious files that are obfuscated using particular techniques to protect them from detection or analysis.

TrojanDownloader:Win32/Small.gen!AD is a program that silently downloads and executes arbitrary files without the affected user’s consent. Installation details and the files downloaded and executed may vary from instance to instance of this detection.

Worm:Win32/Slenping.AD is a worm - a self-propagating program that can spread itself from one computer to another. Worms may spread themselves via a variety of different channels in order to compromise new computers. Commonly, worms may spread directly by copying themselves to removable or network drives, or by attempting to exploit particular vulnerabilities on targeted computers. Worms also often attempt to spread via platforms that require user interaction in order to run. They may send themselves as an attachment to an email or an instant message, or send a link to a copy of themselves in the body of a message. In these cases the message needs to be convincing enough to encourage the victim to click on the link or attachment and run or download a copy of the worm.

Backdoor:Win32/Zegost.AD is malware that drops a backdoor trojan in your computer. The backdoor trojan is detected as Backdoor:Win32/Zegost.X.