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This view immediately tells you the Key4.exe is a lone gunner, apparently with no extra DLLs other than the system DLLs. You know this because other than the Key4.exe module, the rest of the modules are all operating system components. This is easy to tell because they are all in the C:\WINDOWS\ SYSTEM32 directory, and also because at some point you just learn to recognize the names of the popular operating system components. Of course, if you re not sure it s always possible to just look up a binary executable s properties in Windows and obtain some details on it such as who created it and the like. For example, if you re not sure what lpk.dll is, just go to C:\WINDOWS\SYSTEM32 and look up its properties. In the Version tab you can see its version resource information, which gives you some basic details on the executable (assuming such details were put in place by the module s author). Figure 11.4 shows the Version tab for lpk. from Windows XP Service Pack 2, and it is quite clearly an operating system component. You can proceed to examine which APIs are directly called by Key4.exe by clicking View Names on Key4.exe in the Executable Modules window. This brings you to the list of functions imported and exported from Key4.exe. This screen is shown in Figure 11.5.

Find a buoy. Start as close as you can, either with the mark to windward or leeward, and hold position for as long as possible. Buoy to Windward: Start right next to the buoy; the boat will slowly drift to leeward (the exact speed depending upon the conditions). When you are two boat lengths from the buoy, put in two tacks and start again (if the buoy is to windward). To tack without going over the line, sheet in as little as possible to get the boat moving, overemphasise the steering and, if possible, back the main by pushing the boom out. When you pass, head to wind. (This will stop you going forwards, as well as helping you turn.) To get the bow down, back the jib by pulling in the wrong sheet. With a self-tacking jib, literally pull it to windward.

(19.6)

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Figure 11.5 Imports and exports for Key4 (from OllyDbg).

At the moment, you re interested in the Import entry titled USER32. MessageBoxA, because that could well be the call that generates the message box from Figure 11.2. OllyDbg lets you do several things with such an import entry, but my favorite feature, especially for a small program such as a crackme, is to just have Olly show all code references to the imported function. This provides an excellent way to find the call to the failure message box, and hopefully also to the success message box. You can select the MessageBoxA entry, click the right mouse button, and select Find References to get into the References to MessageBoxA dialog box. This dialog box is shown in Figure 11.6. Here, you have all code references in Key4.exe to the MessageBoxA API. Notice that the last entry references the API with a JMP instruction instead of a CALL instruction. This is just the import entry for the API, and essentially all the other calls also go through this one. It is not relevant in the current discussion. You end up with four other calls that use the CALL instruction. Selecting any of the entries and pressing Enter shows you a disassembly of the code that calls the API. Here, you can also see which parameters were passed into the API, so you can quickly tell if you ve found the right spot.

(19.7)

11

The first entry brings you to the About message box (from looking at the message text in OllyDbg). The second brings you to a parameter validation message box that says Please Fill In 1 Char to Continue!! The third entry brings you to what seems to be what you re looking for. Here s the code OllyDbg shows for the third MessageBoxA reference.

They further show that the spectral density function of the one-dimensional process, S1 ( ), is related to the radial spectral density function by S1 ( ) = 2 f ( ) 2 (19.8)

Buoy to Leeward: Start two boat lengths from the buoy and stay on the line for as long as possible. Once you get to the point where you could no longer sail over the line (DO NOT HIT THE

0040133F 00401341 00401343 00401345 0040134A CMP EAX,ESI JNZ SHORT Key4.00401358 PUSH 0 PUSH Key4.0040348C PUSH Key4.004034DD

zi ( ) = 2

PUSH 0 CALL <JMP.&USER32.MessageBoxA> JMP SHORT Key4.0040136B PUSH 0 PUSH Key4.0040348C PUSH Key4.004034AA

; ASCII KeygenMe #3 ; Text = Great, You are ranked as Level-3 at Keygening now ; hOwner = NULL ; MessageBoxA ; Style = MB_OK|MB_APPLMODAL ; Title = KeygenMe #3 ; Text = You Have Entered A Wrong Serial, Please Try Again ; hOwner = NULL ; MessageBoxA

[S1 ( k ) ]1/2 cos( k + k )

00401364 00401366 0040136B

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