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findhash's Introduction

findhash

在哈希算法上,比Findcrypt更好的检测工具,同时生成Frida hook代码。 image

使用方法

  • 把findhash.xml和findhash.py扔到ida plugins目录下
  • ida -edit-plugin-findhash

试图解决的问题

  • 哈希函数的初始化魔数被修改
  • 想快速验证所分析的函数中是否使用了MD5,SHA1、SHA2这些哈希算法。
  • Findcrypt/Signsrch没找出来

可以应对如下各种findcrypt找不到或者哈希函数被魔改的情况 image

image

image

image

原理

通过正则表达式匹配伪C代码中的初始化魔数代码以及哈希运算函数,很粗鲁暴力,所以运行时间会比较长,因为要反编译所有函数,但对哈希算法的检测上效果非常nice。

TODO

  • 适配arm64
  • 增加对特征常量立即数的搜索
  • 增加对一个函数汇编中的位运算比例的计算,以及循环的识别。根据相关理论,高占比的位运算指令以及循环,是加解密算法难以抹去的结构特征。

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findhash's Issues

IDA7.0报错

请问下这个使用对于IDA有什么版本要求吗?
C:\self-program\IDA_Pro_v7.0_Portable\plugins\findhash.py: invalid syntax (C:/self-program/IDA_Pro_v7.0_Portable/plugins/findhash.py, line 109)
Traceback (most recent call last):
File "C:\self-program\IDA_Pro_v7.0_Portable\python\ida_idaapi.py", line 553, in IDAPython_ExecScript
execfile(script, g)
File "C:/self-program/IDA_Pro_v7.0_Portable/plugins/findhash.py", line 109
value["describe"] = f"函数{value['funcName']}疑似哈希函数主体,包含初始化常数以及运算部分。"
^
SyntaxError: invalid syntax

你好,能开发个ida 7.0版本的吗

修改了部分报错后在ida7.0执行有出结果,mac上,但感觉和一篇博客上的输出信息不对,ida7.5虚拟机装了后选项里没有插件

请问ida 7.0支持嘛?

我这边按操作将两个文件放入plugins后,导航栏里的 edit,plugins里面并没有显示出findhash。

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