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

Customers in the US using antivirus software from the Moscow-based cybersecurity company Kaspersky are finding that the software has been deleted and replaced by antivirus protection from a different company,

After U.S. ban, Kaspersky's American customers were automatically migrated to UltraAV antivirus, in some cases without the customers' knowledge.

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.

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

Kaspersky antivirus software automatically deletes itself from U.S. users' computers and installs UltraAV without warning.

Last week, users of Kaspersky anti-virus software found that the software had been uninstalled from their computers and that UltraAV's anti-virus had been installed in its place. The users had not consented to or initiated any of it.