The iframe.htm page is called from the iframe tag (see code below) in the grc.com\intro.htm page, I thought that DrWeb was now scanning deeper.
<iframe id="zerosize" src="/iframe.htm" scrolling="no"></iframe>
The above doesn't seem very dangerous, however the code in the iframe page, has yet another iframe tag and that calls another page, http :// www . grctech.com/_c5mctohclsuvh_/iframe1.htm. So this circular calling may be suspicious. Note the total content of the called pages is just an iframe tag. To all intents and purposes they appear benign, but I gave up after the 4th page, but I can imagine it goes on for some time. Why is the 64,000 dollar question.
<iframe src="http://www.grctech.com/_c5mctohclsuvh_/iframe1.htm" width=0 height=0 frameborder=0 marginwidth=0 marginheight=0 scrolling="no"></iframe>
Which calls yet another page from an iframe tag
<iframe src="http://www.grc.com/iframe2.htm" width=0 height=0 frameborder=0 marginwidth=0 marginheight=0 scrolling="no"></iframe>
Which calls yet another page from an iframe tag
<iframe src="http://www.grctech.com/_3mg42bcq3evok_/iframe3.htm" width=0 height=0 frameborder=0 marginwidth=0 marginheight=0 scrolling="no"></iframe>
This page call seems to end the cycle as the only code on the called page is:
<html></html>
I don't know what is going on but it is strange to say the least, but appears benign.