Trojan:Win32/Powessere.H
This trojan is malicious behavior associated with Kovter and other sophisticated fileless malware.
Microsoft Defender Antivirus detects this trojan whenever a command line designed to launch certain malicious JavaScript or VBScript code is run. Microsoft Defender Antivirus blocks the execution of the malicious script code, curtailing intended fileless attack activity.
TrojanDownloader:Win32/Urausy.J
Windows Defender detects and removes this threat.
This threat can download other malware onto your PC.
It is from a family of ransomware locks your PC and displays a full-screen message (commonly called a "lock screen").
See the Ransom:Win32/Urausy family entry, and our ransomware page for more information.
JS/Fiexp
Microsoft security software detects and removes this family of threats.
This is a family of JavaScript components belonging to an exploit kit called Fiesta. Similar to other exploit kits, such as Blacole, it first checks your browser, version, and installed plugins. It does this to determine which exploit to use on your PC.
Malware in this family can exploit vulnerabilities in Java, Adobe Flash Player, Adobe Acrobat Reader, Microsoft Silverlight, and Internet Explorer.
They can run on your PC when you visit a hacked or malicious website.
HTML/Fiexp
Windows Defender detects and removes this threat.
The threat is a webpage that tries to exploit vulnerabilities in software on your PC. It can then try to download other malware.
It tries to exploit vulnerabilities in the following software:
- Java
- Adobe Flash Player
- Adobe Acrobat Reader
- Microsoft Silverlight
- Internet Explorer.
Members of the Fiexp family belong to the exploit kit called Fiesta.
See the family description for HTML/Fiexp and our page on exploits for more information.
This threat might get into your PC if you visit a hacked or malicious website.