/lib/systemd/system/vboxdrv.service

[Unit]
SourcePath=/usr/lib/virtualbox/vboxdrv.sh
Description=VirtualBox Linux kernel module
Before=runlevel2.target runlevel3.target runlevel4.target runlevel5.target shut$
After=$syslog.service
Conflicts=shutdown.target

[Service]
Type=forking
Restart=no
TimeoutSec=5min
IgnoreSIGPIPE=no
KillMode=process
GuessMainPID=no
RemainAfterExit=yes
ExecStart=/usr/lib/virtualbox/vboxdrv.sh start
ExecStop=/usr/lib/virtualbox/vboxdrv.sh stop

[Install]