Guess it should be the method to be executed when the message 'Withdrawal message' is received, so let's try it. Then I noticed that there is a method in MessageService : - (void)onRevokeMsg:(id)arg1 Search, the target instantly shrunk to single digits. Since it is a withdrawal message, the method name should include 'Withdraw'. Then use class-dump first to export the WeChat header file.Īfter taking a look, the 40+M binary file actually contains 2000+ header files. This time our goal is to disable the other party's withdrawal function, that is, even if the other party withdraws the message, we can still see the other party's message. In view of the relatively simple reverse engineering of WeChat on the Mac side, let's start with this this time. Due to the prerequisites, I won't talk about it this time. If you have a jailbroken device, you also need to 'knock the shell' on the application with dumpdecrypted. To realize the reverse engineering of Mac-based (macOS, iOS) Apps, you first need the assistance of some tools: Since all my iOS devices are above 9.3.5 (manually cover my face), the prerequisite for this reverse engineering is to run on a non-jailbroken device. Therefore, this article is not intended to crack any software, just take some commonly used apps as examples to explain the reverse knowledge from a technical point of view. Of course, software rights should be protected, and reverse technology should not be used illegally. Through this reverse, I finally realized the iOS end micro-channel message anti withdraw and amend the number of motion steps and anti withdraw Mac end micro-channel messages and Thunder-free landing members to use free offline download function. The first time I set foot in reverse engineering, I was only planning to understand the knowledge of reverse engineering, and then realized that reverse engineering can be used to do something interesting, so I recorded it after finishing it~ Practice results Taking advantage of the New Year's Day holiday, I spent a day learning about the reverse technology of iOS and Mac App.

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