What is shellcode and how is it used?

Shellcode is a set of instructions that executes a command in software to take control of or exploit a compromised machine. Read up on the malware term and how to mitigate the risk.

Shellcode is sequence of machine code, or executable instructions, that is injected into a computer's memory with the intent to take control of a running program. In such an attack, one of the steps is to to gain control of the program counter, which identifies the next instruction to be executed. Program flow can then be redirected to the inserted code. The intrusive machine code is called the payload of the attack and is the element commonly referred to by the term shellcode. This method has often been used to grant an attacker access by opening an operation system command shell, so code injection attacks in general have come to be known as shellcode.

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