The vulnerability allows the installation of the DoublePulsar backdoor, which ends up residing only in the kernel memory. How would such malware infect a machine in the first place? One example is where a target machine receives malicious network packets that exploit the EternalBlue vulnerability. This makes it more difficult to detect as there are no stored files for defensive security software to scan, I will work on some samples that give an idea on how fileless malware can execute and stay living in memory, research from Microsoft categorizes them in 3 types:Ī fully fileless malware can be considered one that never requires writing a file on the disk. While processes that are critical to Windows activity are running, this malware distributes and re-injects itself into these processes, making it trickier to detect as these don’t trigger traditional red flags or whitelists.įileless malware exists only in a computer random-access memory (RAM) meaning that nothing is ever written directly to the hard drive. Memeory Injection technique involves hiding malicious code in the memory of a legitimate process.
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