Ssh Uname Machine Architecture With Fallback Echo

Identifies an SSH session where the attacker executes uname -m to retrieve the system’s machine architecture, suppressing errors via 2>/dev/null and falling back to echo unknown if the command fails. This pattern is commonly used in automated post-compromise reconnaissance to determine CPU architecture (e.g., x86, x86_64, arm, mips) for selecting an appropriate malware payload binary.