After that, we can upload the already unpacked application to IDA Pro and restore the assembler code. We upload our application to IDA Pro once more, and when the system asks us whether to upload symbols from the server, we agree. Here is the result of application analysis in IDA Pro:.
You can see in Screenshot 17 that we now have some readable code, more detected functions, and an import table Screenshot At this point, we can run the application and debug it in IDA Pro. After that, we receive the following warning message:. Our tested application detected that it was debugged. To continue with our analysis, we need to disable debugger detection first.
At once, we can notice the NtQueryInformationProcess function. After clicking on it, we get the following list of xref functions:. The third parameter is an output parameter. After a function call, the result of the function is checked test eax, eax.
This value contains the result from al lower bytes. Before that, the esi result is written to eax , and 1 is written to esi. To do so, press N or right-click on the function and select Rename. Place the cursor over it and click X , or right-click and select Jump to xref to operand :. We already know the first four places where this variable is used, but not the last one. Gladly, this verification can be removed. Press F5 and set the address this way:.
Now we can replace this code with, say, jmp to a specific address so that this condition will never be satisfied in real applications, it can be an exception to immediately close the application. Press F3 and then F2 to switch to the Edit mode. Enter the address of the next command after if.
After editing, our modified command is highlighted in yellow. Press F9 to update and save the application. When looking at the assembler code, we see that the new jmp will result in calling esi further down the code, and esi will contain garbage instead of the MessageBox function address. Thus esi will not be initialized, and the application will crash at Now, we should set the relative address in jmp to 14, but no longer to 1E, because the command has become closer to the command we are going to.
Now, to make jmp , we need to save the MessageBox address to esi. In Screenshot 35, you can see that there is an unconditional jump. If we run the application via the debugger, the application will crash because the previous command contains an absolute address, and after the application starts, the loader passes the relocation table and adds delta to each value to make all addresses valid.
What we need to do now is remove this value from the relocation table. Thus, we have to remove the A value from the relocation table. To do so, we need to open the current version of our test application with Relocation Section Editor.
CFF Explorer can help us fix this issue. We have found the value — — on which delta for MessageBox used to be added. You can also add your own functions to API Monitor and use this tool to monitor network function calls and research passed parameters of course, if traffic is not encrypted. So we select only them in User After running our process, we see the list of called functions. Also, we can set different breakpoints for a function:. Read also: Reverse Engineer Software.
But before exploring a binary, we need to determine its type with a hex editor. In our example, we use WinHex. The MZ signature at the zero offset corresponds to PE format files executables or shared libraries , so this is an exe file or dll. Most file formats have unique signatures.
Instead, we'll dump its memory and try to run it. To do that, we open the packed executable file in IDA Pro. How to reverse audio with our app? Drag the file into the online audio reverser. Reverse Audio alters the file automatically and provides you with a download link in a matter of seconds. Audio Reverser is a free online app that allows you to modify audio files to make them play backward.
With this app, you can download the altered file without quality deterioration and play audio in reverse in less than a minute. Our online audio reverser supports all popular file formats and works with files up to 6 GB. And the best part — you can alter your files in just a few clicks. Help Privacy Pricing Contact Us. Select Language. Contact Us. Please use this form to get in touch with us, report a bug, or suggest a feature. Send message. NET programs , then this course is for you.
In this course, I will introduce you to the exciting world of reversing and in particular, reverse engineering. NET programs. In this course, you will learn how to use dnSpy, de4dot and UnconfuserEx tools to reverse engineer. You will learn all about debugging and dumping memory and also how to reverse jumps and modify instructions. This course is backed by a day money back guarantee. So you have nothing to lose. Click on the "Import" option to select a video.
Step 2. Right-click on the selected video and select the "Add to Project" option from the context menu. Step 3. Double click the video from the track and select the "Reverse" option. Wait for the process to finish. Step 4. Click on the Export option, and select the media format or platform in which you want to export the video. Make sure to choose the quality of output, video encoder, frame rate, and bitrate.
If you are a Mac user, you must hear about iMovie. This software is popular among the macOS users, who like to use it to edit videos, share movies, and play video. Using this program, users can add transitions, backgrounds, titles, change video size, and other more functions. Especial this program has a video reverse function, and you can use it to create a wonderful reverse video. Video Reverse tools available online are quite popular as they are widely used for fun purposes as well as professional usage.
These tools are interesting as they reverse video from the end frame to the beginning.
0コメント