/lib/udev/rules.d/60-open-vm-tools.rules is in open-vm-tools 2:10.2.0-3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # VMWare Virtual Sockets permissions
#
# after loading the vsock module, a block device /dev/vsock will be created with permission 0600
# This rule changes permission to 0666 to allow users access to the virtual sockets
KERNEL=="vsock", MODE="0666"
|