You receive an alert for malicious code that exploits Internet Explorer and runs arbitrary code on the site visitor machine. The malicous code is on an external site that is being visited by hosts on

The string 'MSIE 10.0' is the definitive User-Agent token for Microsoft Internet Explorer 10, and 'Trident 6.0' confirms its proprietary rendering engine. Because the malicious code specifically exploits Internet Explorer, any internal host presenting this User-Agent was running the vulnerable browser when visiting the external site. This combination of MSIE and Trident is the key indicator linking that host to the exploitable attack surface.

This User-Agent identifies Mozilla Firefox on Linux using the Gecko engine, which is not Internet Explorer and is not affected by an IE-specific exploit.

This User-Agent represents Mozilla Firefox on Windows using the Gecko engine; despite the Windows platform, it is not Internet Explorer and is not the targeted browser.

This User-Agent identifies the Opera browser on Linux using the Presto rendering engine, which is unrelated to Internet Explorer and unaffected by the reported vulnerability.