Linux process name masquerading is a malware obfuscation technique where a malicious process changes its name as reported by the system to hide its true identity. The process name can be altered in /proc/<pid>/comm using prctl(PR_SET_NAME) and in /proc/<pid>/cmdline by overwriting the argv and environ memory regions, despite argv[0] being a fixed-size buffer. This allows the process to appear under a benign or system-like name, misleading security analysts and some security tools. The technique corresponds to MITRE ATT&CK technique T1036 and has been used by threat actors such as the Velvet Ant group. Detection requires tools that can inspect beyond the standard process name fields, such as eBPF-based monitoring tools like Kunai, which can reveal the actual command line used to launch the process. The threat is specific to Linux systems and does not involve a known exploit or vulnerability but rather an evasion technique.

The impact of this technique is primarily on detection and monitoring capabilities. Malicious processes can evade identification by masquerading as legitimate or system processes, potentially allowing malware to persist undetected on Linux systems. This can hinder incident response and forensic analysis. There is no direct exploitation or system compromise from the technique itself; it is an obfuscation method used by attackers to avoid detection.

No official patch or fix is applicable as this is a technique rather than a software vulnerability. Detection can be improved by using advanced monitoring tools such as Kunai, which leverage eBPF to capture the true command line and process ancestry, helping to identify masqueraded processes. Security analysts should be aware of this technique and consider using tools that do not rely solely on /proc/<pid>/comm or /proc/<pid>/cmdline for process identification. Regular updates to detection tools and threat intelligence are recommended to recognize such evasion methods.