Executive Summary
Windows Subsystem for Linux (WSL2) introduces significant detection gaps by running a full Linux kernel inside a lightweight Hyper-V virtual machine. Because the VM has its own network stack and process table, traditional Windows security tools (like Sysmon) cannot see network connections initiated from within WSL2 or attribute file-write operations to the originating Linux process.
Technically, when a process inside WSL2 writes to the Windows filesystem (via /mnt/c/), the operation is proxied through a Windows COM surrogate process, DllHost.exe. This creates a scenario of 'indirect command execution' where malicious payloads appear to be created by a legitimate, signed Microsoft process, severing the causal link between the attacker's downloader and the staged file on disk. Defenders must pivot from monitoring process identity to monitoring file creation outcomes in high-risk directories.