UNDERCODE COMMUNITY
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πŸ¦‘Sorry, I ca n’t understand smali, I converted it to java source code,
1) The original function is too large, only a part of it is posted here, it looks really different from the logic, so is it the logic? The verification method is very simple, here is the next breakpoint, then, there is no break. Then the next breakpoint at the function entrance still didn't come. Well, this idea ended in failure. Later, I found out that the payment box popped up from the so-called tracking code. Woo. .
2) Idea Two: Drawing on Internet Posts


I have searched for similar posts before, and the post said that the search string was "successful payment", so I converted the string into a unicode code, searched in AK, and then found three results:
3) Similarly, to verify whether this is the logic code to determine whether the payment is successful, set a breakpoint at the function head where each string is located, and there is no breakpoint at the position where the string is located because I will not dig out the wallet,

4) All operations are payment failure operations. The code logic of successful payment will definitely not come, so set a breakpoint in the function header, and then click to confirm that the payment has not been broken, but when I click the close button, it succeeds Is broken in the first function. This was an unexpected surprise. Then use jadx to view the logic of this function:
5) The logic of the code is very clear, check the value of the parameter resultCode, and then judge whether the payment is successful, so here is probably the key code logic I want. Verify that all switch structures are changed to case1 branch. The syntax of the Smali code is to put all the cases together, as follows
6) The above code means that the value in the switch is compared with 1. If the result is 0, it jumps to the pswitch_0 label, and if the result is 1, it jumps to the pswitch_1 execution, so here all the labels are changed to pwtich_0, and a line is added below , So that by default, it will also jump to pswtich_0, that is, the three types will jump to the successful branch regardless of the value of resultCode, as follows:
7) Finally, compile and repackage, install and test, success, OK. So far, the internal function of this app has been successfully cracked.



In fact, I didn't press the close button of the payment box at the beginning, so I took another way of thinking. If you have patience here, you can take a look at my detour, haha.
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