Breaking Protections in .NET

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The return value from this function can be fed into the following code:
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char name[256]; char fsname[256]; DWORD complength; DWORD VolumeSerialNumber; GetVolumeInformation( C:\\ , name, sizeof(name), &VolumeSerialNumber, &complength, 0, fsname, sizeof(fsname)); printf ( Volume serial number is: 0x%08x\n , VolumeSerialNumber); printf ( Computing serial for name: %s\n , argv[1]); WCHAR wszName[256]; mbstowcs(wszName, argv[1], 256); unsigned __int64 Name = NameToInt64(wszName); ULONG FirstNum = (ULONG) Name * VolumeSerialNumber; unsigned __int64 Result = FirstNum - (ULONG) 0xb14ac01a; printf ( Name number is: %08x%08x\n , (ULONG) (Name >> 32), (ULONG) Name); printf ( Name * VolumeSerialNumber is: %08x\n , FirstNum); printf ( Serial number is: %08x%08x\n , (ULONG) (Result >> 32), (ULONG) Result);
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This is the code for the keygen program. When you run it with the name John Doe, you get the following output.
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Volume serial number is: 0x6c69e863 Computing serial for name: John Doe Name number is: 000000212ccaf4a0 Name * VolumeSerialNumber is: 15cd99e0 Serial number is: 000000006482d9c6
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Naturally, you ll see different values because your volume serial number is different. The final number is what you have to feed into Defender. Let s see if it works! You type John Doe and 000000006482D9C6 (or whatever your serial number is) as the command-line parameters and launch Defender. No luck. You re still getting the Sorry message. Looks like you re going to have to step into that encrypted function and see what it does. The encrypted function starts with a NtDelayExecution and proceeds to call the inverse twin of that 64-bit left-shifter function you ran into earlier. This one does the same thing only with right shifts (32 of them to be exact). Defender is doing something you ve seen it do before: It s computing LOW PART(NameSerial) * VolumeSerial HIGHPART(TypedSerial). It then does something that signals some more bad news: It returns the result from the preceding calculation to the caller. This is bad news because, as you probably remember, this function s return value is used for decrypting the function that called it. It looks like the high part of the typed serial is also somehow taking part in the decryption process.
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You re going to have to brute-force the calling function as well it s the only way to find this key. In this function, the encrypted code starts at 401FED and ends at 40207F. In looking at the encryption/decryption local variable, you can see that it s at the same offset [EBP-4] as in the previous function. This is good because it means that you ll be looking for the same byte sequence:
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unsigned char Sequence[] = {0xC7, 0x45, 0xFC, 0x00, 0x00, 0x00, 0x00 };
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Of course, the data is different because it s a different function, so you copy the new function s data over into the brute-forcer program and let it run. Sure enough, after about 10 minutes or so you get the answer:
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Found our sequence! Key is 0x8ed105c2.
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Let s immediately fix the keygen to correctly compute the high-order word of the serial number and try it out. Here s the corrected keygen code.
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unsigned __int64 Name = NameToInt64(wszName); ULONG FirstNum = (ULONG) Name * VolumeSerialNumber; unsigned __int64 Result = FirstNum - (ULONG) 0xb14ac01a; Result |= (unsigned __int64) (FirstNum - 0x8ed105c2) << 32; printf ( Name number is: %08x%08x\n , (ULONG) (Name >> 32), (ULONG) Name); printf ( Name * VolumeSerialNumber is: %08x\n , FirstNum); printf ( Serial number is: %08x%08x\n , (ULONG) (Result >> 32), (ULONG) Result);
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Running this corrected keygen with John Doe as the username, you get the following output:
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Volume serial number is: 0x6c69e863 Computing serial for name: John Doe Name number is: 000000212ccaf4a0 Name * VolumeSerialNumber is: 15cd99e0 Serial number is: 86fc941e6482d9c6
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As expected, the low-order word of the serial number is identical, but you now have a full result, including the high-order word. You immediately try and run this data by Defender: Defender John Doe 86fc941e6482d9c6 (again, this number will vary depending on the volume serial number). Here s Defender s output:
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Defender Version 1.0 - Written by Eldad Eilam That is correct! Way to go!
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