思路

需要实现准备一份未受感染的源代码和一份可能受感染的源代码，然后运行以下脚本，就能找出到底哪些文件被挂马了。

其中，主要是根据比对2份文件的md5值来过滤可能被挂马的文件（确切的说应该是被修改过的文件）

Python脚本

复制代码 代码如下:

author = 'Flying'

coding:utf-8

Date:2014.6.5

检测修改过的文件

import os,sys,hashlib,datetime
global_DirOld = ""
global_DirNew = ""
global_FilesList = []

输入要比对的文件路径

def InputDirPath():
global global_DirOld,global_DirNew
global_DirOld = unicode(raw_input("请输入备份文件所在目录："),"utf-8")
while not os.path.exists(global_DirOld):
print u"指定的路径不存在，请重新输入"
global_DirOld = unicode(raw_input("请输入备份文件所在目录："),"utf-8")
global_DirNew = unicode(raw_input("请输入要检测文件的目录："),"utf-8")
while not os.path.exists(global_DirNew):
print u"指定的路径不存在，请重新输入"
global_DirNew = unicode(raw_input("请输入要检测文件的目录："),"utf-8")

将数据保存到文件中

def SaveToFile(filePath,content):
try:
f = open(filePath,"a+")
f.write(content.encode("utf-8") + "\n")
f.close()
except Exception,ex:
print "Error:" + str(ex)

计算文件的MD5值

def CalcMD5(filepath):
try:

以二进制的形式打开

    with open(filepath,'rb') as f:  
        md5obj = hashlib.md5()  
        md5obj.update(f.read())  
        hash = md5obj.hexdigest()  
        return hash  
except Exception,ex:  
    print "Error:" + str(ex)  
    return None

遍历目录下的所有文件

def GetAllSubFiles():
global global_FilesList
for dir in os.walk(global_DirNew):
for file in dir[2]:
filePath = dir[0] + os.sep + file
global_FilesList.append(filePath[len(global_DirNew)+1:])

列出新增文件和变动的文件

def ListChangedFiles():
global global_DirOld,global_DirNew,global_FilesList
print u"变动或新增的文件："
for file in global_FilesList:
filePathOld = global_DirOld + os.sep + file
filePathNew = global_DirNew + os.sep + file
if not os.path.exists(filePathOld) or CalcMD5(filePathOld)!=CalcMD5(filePathNew):
content = "[" + datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')+ "]" + filePathNew
print content
SaveToFile("ChangedFiles.txt",content)

if name=="main":
InputDirPath()
GetAllSubFiles()
ListChangedFiles()