That lack of user interaction — or request for consent — is what confused and concerned some former Kaspersky customers.

US-based Kaspersky security solution users have been facing a unique situation in the past few days as their own antivirus software had been replaced with another one called UltraAV.

Some US Kaspersky security users got a big surprise when their protection was suddenly replaced by UltraAV due to a government ban. But Kaspersky’s demise has been looming for years.

Some US-based users of Kaspersky antivirus products have found their software replaced by product from by a low-profile entity named "UltraAV" – a change they didn't ask for, and which has delivered them untested and largely unknown software from a source with a limited track record.

Kaspersky deleted its anti-malware software from computers across the United States and replaced it with UltraAV's antivirus solution without warning.

"Following the recent decision by the U.S. Department of Commerce that prohibits Kaspersky from selling or updating certain antivirus products in the United States, Kaspersky part

The Russian cybersecurity company says it's been notifying users of the change and is aiming for a smooth transition of software.

Kaspersky's antivirus software deletes itself across the US and installs UltraAV instead without notifying customers. Some are frustrated and struggling to uninstall the new program.