Understanding Web Shell Attacks

Web shell attacks are a common technique used by attackers to maintain control of compromised web servers. While many vulnerabilities focus on initial access , web shells are typically used after the breach to establish persistent control. For developers and system administrators, understanding how web shells work is essential for detecting and preventing long-term server compromise. In this article, we'll cover: What a web shell is How web shell attacks work Common web shell examples How attackers use compromised servers How to defend against web shell attacks What Is a Web Shell? A web shell is a malicious script uploaded to a web server that allows attackers to control the server remotely through a web browser. :contentReference[oaicite:0]{index=0} Once installed, it acts like a backdoor that lets attackers execute commands, manipulate files, and interact with the system as if they had shell access. :contentReference[oaicite:1]{index=1} Typical characteristics: Uploaded to the web s