Some years later, professor Thorsten Schneider (aka Zero), along with other great reversers like +Q and Daemon, created REA, the reverse engineering academy that was actually a contest of incredible crackmes and reversemes that crackers would solve to gain points in a hall of fame system. Luckily, you can still find the incredibly knowledge of the +Fravia’s website as a mirror, courtesy of Woodmann. After some years of worldwide success, one of the contributors and creators of this community, +ORC, vanished from the scene and +Fravia froze his website and created a new one about online searching techniques. He created what was the greatest reverse engineering website with tons of information about reverse engineering and really transformed this trade to an art. In case you don’t know about it, +Fravia was one of the most important figures in the reverse engineering world (sadly he died some months ago). At that time, the scene was pretty much scarce due to the fact that the awesome +Fravia website has been frozen. I started learning reverse engineering about 10 years ago. For starters, though, i want to make a short introduction to the history of this fascinating scene and then i will describe the tools needed in order to crack efficiently and also what knowledge you would need to obtain to do so.Ī brief History About Reverse Engineering on My Time In the next posts to come at this blog, i will also be taking some hands on approach, showing you how to crack real protections. In this little post, i will be explaining some of the important aspects of the trade. The days when i would go about opening up hiew editor in order to change that little 74 opcode to 90 seem hilarious at the time of writing this text, but i can understand all those people who just begin learning more about software cracking. For example: 32 3,637,393,034,313,330 36, then, PLC password is: 2679041306.Introduction to Reverse Engineering and Software CrackingReverse Engineering has actually been the main reason why i first began learning more about computers. Found adjacent rows of 3 consecutive 2-digit prefix. ![]() Switch to the serial monitoring software, you can see line by line monitoring data. When prompted for a password, enter 10 for the random number, and then determine, PLC Password prompt to return an error, this time, once again repeated. With the PLC in use RSLINK establish communication, the start serial monitoring software, and then start RSLOGIX500 to connect with the PLC, I use the serial monitoring software, but software can not occupy the port to be monitored. PLC, if the password wrong, will not be able to access PLC. Set the password for the program as well.Ģ, declassified for the PLC KEY: When you use RSLOGIX500 and PLC to establish communication, the prompt for a password before you visit ![]() You can use RSLOGIX500 write a program or did not set a password to open procedure and saved after the password is set, then use Notepad to open and find your own set of passwords. ![]() (Sorry for my bad english, isn't my native language)ĪB RSLogix 500 SLC500 decryptionPLC experience cracking password summarized as follows, for all to share.ġ, the password for the existing procedures : use Notepad to open, the file can be found in the latter part of the password for the consecutive number. If you just want to check if this method works, try to clear your own project's password with this number. Go to the "Controller Properties" > "Passwords". Number 2: I also found a master password that I use to clear the protection. If a had some more time I'll try to port this patch to other versions of RSLogix. Save this file with a new name like, rs500_nopw.exe and try. We replace some instruction by nops and it's done. (My patch is for RSLogix 500 Version 8.10.00 (CPR 9) Build 18 Number 1: You can just patch some bytes and bypass the password check to upload(plc->pc) a program. Now it's simple, after some hours debugging the rslogix I found some interesting things inside this software. In return I wanto to share my private solution for this problem and for all the rslogix 500 compatibles plcs (tested for real with micrologix 1100,1200,1400 Serial and ethernet comms). ![]() Hi, I'm new here, and first want to thanks you people for share the tools to our work.
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