Overview: Memory Injection

Quick Definition

A memory injection is a cyberattack technique where malicious code is inserted directly into a running process's memory space. This method allows attackers to execute harmful code within legitimate processes without writing files to disk, making detection more difficult for traditional antivirus solutions.

Memory injection attacks typically exploit vulnerabilities in how applications manage memory or use legitimate system functions inappropriately. Common techniques include DLL injection, where malicious dynamic link libraries are forced into a process, and process hollowing, where a legitimate process is suspended and its memory replaced with malicious code. Attackers may also use reflective DLL loading to execute code entirely from memory.

These attacks are particularly dangerous because they can bypass file-based detection systems and inherit the privileges of the compromised process. The injected code appears to be running as part of a trusted application, making it difficult for users and security tools to identify malicious activity. Memory injection is frequently used in advanced persistent threats, malware evasion techniques, and post-exploitation activities where attackers need to maintain stealth while executing commands or stealing data from compromised systems.