Python实例分享:快速查找出被挂马的文件

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

__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()

脚本执行结果