One of the common malicious techniques is to store the malicious code within a file disguised as a picture. This means the file has picture extensions such as .jpg, .png, .gif and others, but there's in fact malicious code stored within. Often, even the fake or real image data are and image file structure are reserved, and the malicious code is just appended or injected into a random place within the file.
Such code is later loaded with some small malicious routine inside regular script files. Generally, any script code inside an image file is highly suspicious and most probably sign of an infection.
Any vulnerable site
Cleanup is done by deleting the malicious code from the file, or replacing it with a fresh version. The infection can be found in your system by searching for the malicious string inside your files.
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