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hunting-web-backdoors

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Hunt planted webshells and backdoors across a web source tree — PHP first (also JSP, ASP, Node) — triaging a directory at scale, statically decoding obfuscation layers without ever executing the payload, finding append-infections and fake plugins, and treating known shell families as leads rather than verdicts. Use when a web server is suspected compromised, cleaning a hacked WordPress/Magento/CMS site, vetting a downloaded PHP codebase or plugin for hidden malicious code, or when a file contains eval on decoded input.

secskills-core/skills/hunting-web-backdoors/SKILL.md

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Last checked
Nov 6, 2026

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Repository last updated
Sep 4, 2026
License
MIT

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# Hunting Web Backdoors

This is not a vulnerability audit. You are looking for code an attacker
**already planted** — a webshell, a one-line eval backdoor, a fake plugin, a
malicious line appended to a legitimate file. The weakness that let them in is
`auditing-php-applications`' job; this skill finds what they left behind.

Two things make it hard. The malicious code is deliberately hidden — obfuscated,
split, or buried in a tree of thousands of legitimate files — so a naive grep
misses it. And the tells (`eval`, `base64_decode`, dynamic calls) appear in
plenty of benign code, so a naive grep also drowns you in false positives. The
work is the discrimination.

## When to Use
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