Usually hackers upload shell to victim's site using the vulnerability in that website. Shell allows hackers to hack/deface the website. Sometimes hackers left the shell in the vulnerable sites. Here is simple google search allows you to find a shell uploaded by hackers.
Use one of the following google dork to find the shell:
- intitle:index of/sh3llZ
- "Index of /sh3llZ"
- "/sh3llZ/uploadshell/uploadshell.php"
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DevilsCafe
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