Threat Scorecard

Threat Level: 80 % (High)
Infected Computers: 8
First Seen: March 31, 2021
Last Seen: March 19, 2023
OS(es) Affected: Windows

Vigua.a, or more precisely PUA:Win32/Vigua.A, is a generic detection used by the Microsoft Defender (formerly the Windows Defender). This is the main anti-malware component of the Windows OS and this detection denotes an item that it has found to have suspicious or unwanted characteristics or capabilities. In most cases, users that see a security alert about a file flagged as Vigua.a likely have a PUP (Potentially Unwanted Program) installed on their computers.

PUPs can be equipped with various, intrusive and unwanted capabilities and can fall into different categories - adware, browser hijackers, etc. Adware applications are predominantly focused on the delivery of annoying advertisements to the user's device. The advertisements may take different forms - pop-ups, banners, notifications and more. These advertisements are likely to promote untrustworthy or even unsafe destinations or software products. Users may see advertisements for phishing schemes, technical support frauds, free giveaways, shady adult sites, etc.

Browser hijackers, on the other hand, are focused on taking control of several important browser settings. They modify the homepage, new tab page, and the default search engine to now open a promoted Web address, usually belonging to a fake search engine. It must be noted that most PUPs have data-harvesting capabilities and can collect various data from the system. They may continuously capture and exfiltrate browsing-related data, device details, or even sensitive account information, banking details and payment data.

It must be noted that the Vigua.a detection doesn't necessarily mean that the flagged item is a PUP. It is quite common for generic detections to incorrectly label legitimate files and applications, meaning that the security alert could be a false positive.


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