All Questions
31 questions
0
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35
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How could a CRC-15 CAN be transformed into 8 bytes in an embedded system?
I am analyzing calibration binary files of an embedded system (BMS) that likely uses a CRC-15 CAN checksum.
From my firmware and bootloader file analysis, I have found a PECLookup table, which ...
- 1
0
votes
1
answer
69
views
Offset addressing
I’m writing a C-SKY (CK803S) processor module for IDA Pro, and a question arose about offsets in transitions, small ones are fine, but long ones lead to nowhere, from the documentation:
in code I ...
- 13
2
votes
1
answer
270
views
What are the prerequisite knowledge needed to start solving crackmes?
I started by reading a book on C language and then moved on to "Programming From Ground Up," which teaches basic programming in x86.
School just ended, I'm working on cracking a game called ...
1
vote
0
answers
36
views
Tuning motor temperature
I have a DC motor, running in two modes, slow and fast. I will need to run the motor in FAST mode only. The motor is already running for 10 years. The motor experiences variable load.
According to the ...
- 11
0
votes
1
answer
367
views
Hex editing an IP address of a different length
I am performing some Windows malware research on a rogue AV software called SpySheriff (password: infected). I want to edit the IP address within the PE (.exe) file to change it to my honeypot IP ...
- 195
1
vote
0
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127
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Which encryption returns 192 hash value it means 96 in bytes?
I am reversing an APK and there is a signature that needs to be found.
The function from where the signature is generated is present in the .so file.
I did small debugging. While doing it, the ...
- 11
3
votes
1
answer
874
views
How to resolve illegal instruction for this ARM stack exploitation?
Summary
I am trying to write a stack overflow exploit for ARM Cortex-A72 running
Raspberry Pi OS (32-bit). Because of my choice of OS, I am restricted to
the ARMv7 (32-bit) instruction set.
I have ...
1
vote
1
answer
390
views
How To Access Predefined Class Attributes From IDA Pro After Loading The Binary Without Debugger Attached To Process [closed]
I have this class with constructor offsets and attributes:
public class example
{
// Fields
public float Attribute_1 = 1.5f; // 0x8
public int Attribute_2 = 102 ; // 0xC
// RVA: ...
- 21
2
votes
2
answers
551
views
Changing value of parameter with gdb
I have a file named exploit.c inside which:
#include <stdbool.h>
#include <stdio.h>
const char y1 = 'a';
const char y2 = 'b';
const char y3 = 'x';
const char y4 = 'y';
const char y5 = 'i';...
- 121
2
votes
1
answer
996
views
GDB inserting breakpoint cause Segmentation Fault
I was trying to play around with gdb, and I'm especially interest in seeing how the Procedural Linkage Table(PLT) and the Global Offset Table (GOT) interact with each other. So I set some breakpoints ...
- 21
0
votes
1
answer
92
views
Why compiler is doing this?
While I was disassembling my own C code for practice I saw an interesting point which I want to share with you guys and needs to know the answer as I always get from here. Now, the interesting point ...
- 323
1
vote
2
answers
186
views
Why eax is assigned to 'variable looked' like addresses
#include <stdio.h>
int main() {
int number1, number2, sum;
printf("Enter two integers: ");
scanf("%d %d", &number1, &number2);
sum = number1 + ...
- 323
2
votes
2
answers
443
views
How to test and debug x86 Assembly exceptions in NASM?
I have seen all the exception "IDs" in the Intel Manuals, and just came across sandpile's exception guide, which actually shows some hexcodes. For example, "divide by zero error":
...
- 153
0
votes
1
answer
180
views
How can I modify these?
So I'm onto something interesting, I asked the less direct way but failed to meet the requirements in terms of explanation
So here it is, how would I go about editing these the same way I would go ...
0
votes
0
answers
156
views
Change value of memory in a debugger?
So I got this app loaded in x64, there is a function, let's say
"HeatGainedPerShot", which is basically the value which an object gains everytime it fires,
Such a value would normally exist ...