But programmers get lazy, and systems get complicated. The program should never say, "Hey, Windows, go out and run the first Whizbang you find." Microsoft programming guru David LeBlanc blogged about that years ago. You've been pwned.Ĭompanies that publish big-name programs like Senuti.exe should have their programmers figure out exactly where to find subsidiary programs like Whizbang.dll. The first Whizbang.dll it encounters wins, and it runs. It just looks for a program called Whizbang.dll by scanning through a specific list of locations. Windows doesn't try to authenticate Whizbang.dll. Windows runs the subverted Whizbang.dll file that's inside the folder. sen files, but it doesn't show you DLLs, so the contents of the folder look just fine.
You double-click on the folder - say, on a shared drive or on a USB drive - that contains the. sen file and their own, jiggered Whizbang.dll file in the same folder. It isn't in the system or the Windows folder. It isn't usually in the folder with the Senuti.exe program. They find out that Senuti.exe calls Whizbang.dll and that Whizbang.dll isn't normally located in the high-priority folders. The guys in black hats have been looking at a lot of programs. By default, Windows starts by looking in the folder that contains the Senuti.exe program, then goes to the system folder, then the Windows folder, then the current directory, and so on.
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If the program doesn't tell Windows where to find Whizbang.dll, Windows goes looking for the DLL in a very rigidly defined series of folders (details on the MSDN DLL Search Order page). That's a common (but not recommended) programming practice. Instead, they've discovered that the Senuti program just calls "Whizbang.dll" and lets Windows find it. The guys in black hats also know that the Senuti.exe program doesn't specify exactly where Windows should find Whizbang.dll.
The guys in black hats have been watching Senuti.exe and they know that every time Senuti.exe runs, it fires up a program called, let's say, Whizbang.dll. sen, say, the Senuti.exe program kicks in and loads the. Whenever you double-click on a file with a name that ends in. There's a lot of hand-waving and high-falutin' programming terminology floating around, but at its core the attack goes like this: You have a program called, oh, Senuti.exe and you run it all the time - it's a big-name program from a major manufacturer.
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Known variously as " DLL hijacking," "DLL preloading," or "binary planting" attacks, I tend to think of the approach as a "path exploit." Back in the early days of Windows - and DOS before it - the sequence of DLL search locations was defined by something called a Path variable.
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Rather, they'll rely on how Windows finds and assembles pieces of programs to get their nefarious code to run. Perpetrators - likely to appear in the next few days - won't take on Windows directly. Microsoft just released Security Advisory 2269637, warning of an entire class of new zero-day attacks that take advantage of the way many popular Windows programs are written.
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