The Russia-based antivirus software may be now banned in the United States, but it hasn't left without a trace.

Customers of Kaspersky antivirus in the United States found out in the last few days that their cybersecurity software was automatically replaced with a new one called UltraAV, according to several customers who posted on social media.

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 has unexpectedly deleted its anti-malware software from U.S. customers' computers and installed UltraAV without warning..