Shellcode

Shellcode refers to small, specialized pieces of code that attackers inject into a vulnerable program during an exploit. It’s usually crafted to perform specific actions, like opening a shell or exfiltrating data.

Key Characteristics of Shellcode:

1. Small Size: Shellcode is designed to be compact and efficient so it can easily fit into small parts of a program’s memory. It is typically just a few hundred bytes in size.
2. Executable Code: It is executable machine code, which means it is directly understood and executed by the system’s processor (CPU).
3. Payload: Shellcode is often used as a payload in an exploit. Once an attacker successfully exploits a vulnerability in a program, they inject shellcode into the system to carry out malicious actions (e.g., open a backdoor, execute commands, or steal data).
4. Platform-Specific: Shellcode is often platform-specific, meaning that it’s written to exploit a specific operating system (e.g., Windows, Linux) or architecture (e.g., x86, x64). A shellcode for one operating system may not work on another without modification.