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#Online email obfuscator rot13 32 bitI noticed a trend: they are set to the value of the last 4 bytes of the UEME_CTLSESSION, and these 4 bytes appear to be a 32 bit counter that increases each time the user logs on (only after a reboot?). Hence it definitely was a timestamp, I tried to convert the 8 last bytes to a timestamp with the C# method DateTime.FromFileTime, and Bingo!, I got the date and time when I last ran notepad. ![]() I ran notepad, noted the value of the 8 bytes, ran notepad exactly one minute later and noted the new value of the 8 bytes. I hypothesized that the remaining 8 bytes are a timestamp. The remaining 8 bytes changed apparently at random each time I ran the corresponding program, but in fact only the least significant bytes changed. This was also the case when I deleted the entry and ran the program again. When I ran a program the first time, this counter was initialized to the value of 6. a 32 bit integer with value 9 is stored as 09 00 00 00. Data on Intel machines is usually stored in little-endian format, this means that the least significant byte is stored first, e.g. Because the sixth, seventh and eight byte are zero, I surmized that the 4 bytes starting at byte 5 are a 32 bit counter. The first 4 bytes at first always remained zero, and the fifth byte increased with one each time I ran the corresponding program (like notepad.exe). #Online email obfuscator rot13 trialBecause I had no access to the Internet at that time, I had to resort to the good old trial and error technique to discover the meaning of this data (I tested my program on Windows XP SP2).įor all entries starting with UEME_RUN, the binary data is 16 bytes long. While I developed my program, I became intrigued with the binary data. NET 2.0 does not implement the ROT13 cipher, I had to implement my own method. ROT13 is a monoalphabetic substitution cipher, these ciphers are very easy to decrypt, e.g. My program displays the decrypted UserAssist entries as a treeview: NET 2.0 Framework will already be installed). NET Framework 2.0 runtime to run my program (download it only if you have a problem running my program, if you have an up-to-date version of Windows XP, the. ![]() But it’s not needed to run my program, you’ll only need the. I used Microsoft Visual C# 2005 Express Edition because it’s free, so you can examine and modify my program. There is no setup, it’s just one executable. #Online email obfuscator rot13 codeI posted my program (source code and binaries) here on the gotdotnet site.ĭownload the ZIP file, you’ll have to extract UserAssist\UserAssist\bin\Release\UserAssist.exe to get my program. I wanted this program to have a GUI and I didn’t want to spend much time coding low-level details, so I decided to code it with the Microsoft. So I decided to write my own, just for the fun of it. Some of these pages mention programs to decrypt ROT13, but I didn’t find a program to display and manage the UserAssist data. Google for UserAssist and you’ll find several pages where this is explained in detail, like this one. The value names stored in this key are ROT13 encrypted. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\UserAssist\\Count. ![]() It appeared to be true, Windows Explorer will store info about the programs you run in registry key ![]() We where telling “encryption jokes” (like ROT26) at the office, until a colleague mentioned that a part of the Windows Registry is ROT13 encrypted. ![]()
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