Need help for zencart website that is maliciously redirected

We have a site [url removed, login to view]

Recently some customers called the said that when they entered our url in the browser, they were taken to another website: [url removed, login to view] However, we tried a lots of times on different computers with various IPs, we could not find any problem. But when we check our website on [url removed, login to view], we found the website was indeed 302 redirected to http://www.themagicmoment.co.uk. We have also looked into our access logs and found some of the 302 redirect records that read like:

"GET /bridal-party-dresses-mother-of-the-bride-dresses_c109?gclid=CI_6gu3us7ACFQcrpAodD3KyUw HTTP/1.1" 302 12818 "[url removed, login to view]" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GTB7.3; BTRS123374; SLCC1; .NET CLR [url removed, login to view]; .NET CLR [url removed, login to view]; .NET CLR [url removed, login to view]; msn OptimizedIE8;ENNZ)"

Not sure if the website has been hacked or there is a security problem with zencart that we do not know about?

Thank you for your help!

Kỹ năng: An ninh máy tính, Zen Cart

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