Title:Special File Creation via Mknod Syscall Status:experimental Description:Detects usage of the `mknod` syscall to create special files (e.g., character or block devices).
Attackers or malware might use `mknod` to create fake devices, interact with kernel interfaces,
or establish covert channels in Linux systems.
Monitoring the use of `mknod` is important because this syscall is rarely used by legitimate applications,
and it can be abused to bypass file system restrictions or create backdoors.
References: -https://man7.org/linux/man-pages/man2/mknod.2.html -https://hopeness.medium.com/master-the-linux-mknod-command-a-comprehensive-guide-1c150a546aa8 Author: Milad Cheraghi Date: 2025-05-31 modified:None Tags:
-'attack.persistence'
-'attack.t1543.003'
Logsource:
product: linux
service: auditd
Detection: selection: type:
'SYSCALL' syscall:
'mknod' condition:selection Falsepositives:
-Device creation by legitimate scripts or init systems (udevadm, MAKEDEV)
-Container runtimes or security tools during initialization Level:low
