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JAVA program anti-obfuscation method and terminal

A program and index technology, applied in the field of anti-obfuscation, can solve problems such as analysis obstacles, logical errors, and a lot of time and energy, and achieve the effect of promoting development and reducing costs

Active Publication Date: 2018-06-12
XIAMEN MEIYA PICO INFORMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the reverse analysis industry, the obfuscated byte code has caused great obstacles to the analysis, resulting in the need to invest a lot of time and energy in the analysis, so an anti-obfuscation technology is needed to help reverse analysts to reduce the workload
[0006] Most of the existing Java decompilation tools on the Internet fail to compile when dealing with obfuscated JAR packages. The main reason is that the obfuscator uses some invalid codes to confuse the stack of the program, and the decompiler follows the normal code. Analysis will lead to logic errors, so the decompilation fails

Method used

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  • JAVA program anti-obfuscation method and terminal

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Please refer to figure 1 , Embodiment 1 of the present invention is:

[0077] A kind of JAVA program anti-obfuscation method provided by the present invention comprises the following steps:

[0078] S1: Obtain the first index corresponding to the call instruction according to the call instruction in the bytecode corresponding to the JAVA program; rename the package name in the JAVA program according to the first index and the preset second index set , class name, interface name and member variables, to obtain the first JAVA program; the second index set includes indexes corresponding to package name, class name, interface name and member variables in the JAVA program;

[0079] The S1 is specifically:

[0080] Obtain the JAVA program and the bytecode corresponding to the JAVA program according to the preset JAR package;

[0081] According to the obfuscation rules of the JAVA program, rename the package name, class name, interface name and member variables in the JAVA ...

Embodiment 2

[0108] Please refer to figure 2 , the second embodiment of the present invention is:

[0109] A JAVA program anti-obfuscation terminal provided by the present invention includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the following steps when executing the program:

[0110] S1: Obtain the first index corresponding to the call instruction according to the call instruction in the bytecode corresponding to the JAVA program; rename the package name in the JAVA program according to the first index and the preset second index set , class name, interface name and member variables, to obtain the first JAVA program; the second index set includes indexes corresponding to package name, class name, interface name and member variables in the JAVA program;

[0111] The S1 is specifically:

[0112] Obtain the JAVA program and the bytecode corresponding to the JAVA program according to the preset JAR p...

Embodiment 3

[0133] The symbols in this embodiment refer to: package name / class name / interface name / member variable;

[0134] The anti-obfuscation scheme of the present invention is analyzed on the basis of Java bytecode. The tool javap provided by the JDK used will decompile the java bytecode into JVM instructions similar to assembly instructions.

[0135] Renaming includes static renaming and dynamic renaming.

[0136] Static renaming refers to analyzing JVM instructions without running them. Mainly by analyzing the class name, interface, and method used in the instruction, a call index is initially established for each class, and then all objects referenced to the symbol are replaced according to the records of the index when renaming.

[0137] Dynamic renaming refers to executing Java bytecode in a customized JVM virtual machine, and improving the call index generated in static analysis through reflection and call stack. According to the execution process in the JVM to simplify and ...

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Abstract

The invention provides a JAVA program anti-obfuscation method and a terminal. According to a first index and a preset second index set, a package name, a class name, an interface name and member variables are renamed to obtain a first JAVA program, execution information when a Java virtual machine executes a bytecode is recorded through OpenJDK, the uncalled member variables of the first JAVA program and a function are deleted to obtain a second JAVA program, according to a statement execution process in the execution information, the unexecuted statemenTS in the second JAVA program are deleted to obtain an optimized JAVA program. According to the method, the problem is solved that in the original confused Jar package, the package name, class name, method in the JAVA program are replaced with meaningless names, much confusion can be produced when the meaningless names are viewed in reverse analysis, resulting in that the reverse analysis process is very time-consuming.

Description

technical field [0001] The invention relates to the field of anti-obfuscation technology, in particular to a JAVA program anti-obfuscation method and a terminal. Background technique [0002] Software obfuscation is a "mathematical puzzle" encryption software system jointly designed by researchers at UCLA and IBM. This system allows users to use it as a program while preventing any hidden deciphering. In the process of program development in the computer field, the simplest obfuscation is name obfuscation, and the more intensive process obfuscation makes people unable to understand the principles of software programming and prevents those who want to obtain the source code to protect the source code. [0003] At present, the Java language generally uses ProGuard as a compression, optimization and obfuscation tool. ProGuard is an open source and free Java bytecode compression, optimization, and obfuscator, which is widely used in Java application development and Android deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F8/20G06F8/53
CPCG06F8/24G06F8/53
Inventor 张涛苏再添吴少华
Owner XIAMEN MEIYA PICO INFORMATION
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