Method

to put the file into the picture is best to have basic DOS command line knowledge. But it doesn't matter, follow the steps below.

Preparation: 1. A picture; 2. A txt file to be tested; 3. WinRAR.

Steps:

1: Prepare a picture, such as w.jpg. Prepare the target file, such as test.txt . We have to hide the test.txt in the picture.

2: The file to be hidden test.txt is compressed with WinRAR. Generate a test.rar archive.

3: Open the command line prompt: Click "Start → Run" and enter "cmd".

4: We assume that both files are stored under "D:". Enter the command: copy /b D:w.jpg + D:test.rar D:w.jpg.

5: ok, try to open the generated image w.jpg, yes, it is indeed the original picture.

6: How to open that txt file? Open WinRAR, click "File → Open (shortcut Ctrl + O)", then select the file type as "all files", find w.jpg, choose to open it, is there a txt file?

I wonder if some hackers are also using these add-on Trojans? When you download pictures, you must pay attention to safety.