PHP_in_Image: precise downside or false optimistic?

I'm very very new to these items – I'm a entrance finish developer which places me 3,000,000x extra certified than anybody else at my work to cope with this, however that's not saying a lot. I do know sufficient to know the way little I learn about internet sec.

Anyway, this weekend, a scan (ClamAV on a CentOS server) discovered an contaminated file on our server. The ClamAV message included "YARA PHP_in_Image." I remoted the file and I've been making an attempt to determine what occurred ever since.

I googled it and located this:

https://github.com/Yara-Guidelines/guidelines/blob/grasp/Webshells/WShell_PHP_in_images.yar

Which signifies to me (a noob) that the picture file might need a type of strings in it. So I opened the file in Vim and, certainly, I discovered "<?php" buried deep in there. Nonetheless, it was adopted by extra of the everyday gobbledygook that you simply see if you open a picture in a textual content editor – there didn't appear to be any readable php in it.

May the <?php be a random character choice, much like all the remainder of the gobbledygook? Or might the gobbledygook be precise php code? May the gobbledygook be obscuring readable code? The enterprise does giant scale digitization of paper paperwork, so the folder with the contaminated file has someplace round 58,000 recordsdata – and there are lots of folders like this. So now we have a whole lot of pictures – so if now we have an issue, it may be a giant downside.

The core of my query is: do I have to be anxious?

Thanks upfront

submitted by /u/sparkletastic
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