Posted 27 July 2013 - 03:13 AM
If you rely on digital signatures for your Windows file system analysis (malware, forensics, ...), there something I found out recently.
On Windows machines prior to Windows 7, you will find .msi packages in folder %windir%\installer with an invalid signature.
These packages got their digital signature invalidated because of a design error in Windows Installer.
This was fixed in Windows Installer 5.0 (released with Windows 7).
SANS ISC Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2018
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