19、计算机取证实用脚本与案例分析

计算机取证实用脚本与案例分析

在计算机取证领域,脚本的运用能够极大地提高工作效率,帮助专家更高效地获取和分析相关信息。以下将介绍一些实用脚本以及相关案例分析。

1. 实用脚本介绍
1.1 MAC 和 Linux 系统基本信息捕获脚本

该脚本用于从运行中的 MAC 或 Linux 系统收集计算机时间设置和 IP 配置等基本信息。

#!/usr/bin/perl
use warnings;
use strict;
#Script that gathers computer time setting and IP-configuration from running MAC/Linux system
#NOTE: Designed and tested for MAC OS X
print "NOTE! Run the script with elevated permissions if possible (i.e as root of with sudo)\n"; 
print "chose name of output file (Will be stored in the location the script is ran from)\n"; 
my $outputname=<>;
chomp($outputname); 
open(OUT, ">>" ,"$outputname\.txt") or die "Cant open output file";
print "do you want to add case data to outputfile? (yes/no)\n"; 
my $i=<>;
chomp ($i);
if($i=~/yes/){
print OUT "----Case data----\n\n"; 
print "submit case number:";
my $casenumber=<>;
print OUT "CASE: $casenumber";
print "\nsubmit evidence number:";
my $evidence=<>;
print OUT "EVIDENCE: $evidence";
print "\nsubmit examiner name:";
my $name=<>;
print OUT "EXAMINER: $name";
print "\nsubmit current date and time (Fröken UR):";
my $realtime=<>;
print OUT "Time of examination: $realtime";
print OUT "\n\n----Gathered data presented below----\n"; 
} 
print "\nGathering date and time.......\n"; 
use POSIX qw(strftime);
my $date = strftime "%Y%m%d_%H%M", localtime;
print OUT "####System date and time###\n $date\n\n"; 
print "Gathering system hostname......\n";
my $hostname=`hostname`;
print OUT "####System hostname (including domain information if present)####\n $hostname\n"; 
print "Gathering system IP-configuration......\n"; 
my $IPinfo=`ifconfig`;
print OUT "####System ip configuration####\n $IPinfo\n\n"; 
print "Gathering list of open connecƟons (UDP/TCP)......\n"; 
my $OC=`netstat -ant`;
my @OC=split(/AcƟve LOCAL/,$OC);
print OUT "####List of open connecƟons####\n $OC[0]\n\n"; 
print "Gathering list of running processes......\n"; 
my $processes=`ps -ef`;
print OUT "####List of running processes####\n $processes\n\n"; 
print "Gathering list of mounted drives/shares......\n"; 
my $mounts=`mount`;
print OUT "####List of mounted drives/shares####\n $mounts\n\n";
print "Gathering list of system users......\n"; 
print OUT "####InformaƟon about system users####\n ";
my @users=`dscl \. list /Users | grep -v ^_\.\*`;
foreach (@users) {
my $info=`id $_`;
chomp($_);
print OUT "\n---InformaƟon about the user $_ ---\n"; 
print OUT $info;
} 
close (OUT);

操作步骤如下:
1. 以提升的权限运行脚本(如以 root 身份或使用 sudo)。
2. 输入输出文件的名称,该文件将存储在脚本运行的位置。
3. 选择是否添加案例数据到输出文件,如果选择“yes”,则依次输入案例编号、证据编号、 examiner 姓名和当前日期时间。
4. 脚本将自动收集系统的日期时间、主机名、IP 配置、开放连接列表、运行进程列表、挂载的驱动器/共享列表以及系统用户信息,并将这些信息保存到输出文件中。

1.2 Windows 系统基本信息捕获脚本

此脚本用于从运行中的 Windows 系统收集计算机时间设置和 IP 配置等基本信息,并且设计为最小化内存使用。

$outpath = Read-host -Prompt 'This script gather basic computer information. Input 
full path to the output file: '
[Datetime]::Now | Out-File -Append $outpath
Get-WmiObject Win32_Computersystem | Out-File -Append $outpath
get-wmiobject win32_networkadapterconfiguration -filter "ipenabled=true" | Out-File -
Append $outpath
netstat -aonp TCP| Out-File -Append $outpath
Get-Process| Out-File -Append $outpath
gwmi -Class Win32_LogicalDisk| Out-File -Append $outpath
Get-WmiObject -Class Win32_UserAccount -Filter  "LocalAccount='True'"| Out-File -
Append $outpath

操作步骤如下:
1. 运行脚本后,输入输出文件的完整路径。
2. 脚本将自动收集当前日期时间、计算机系统信息、网络适配器配置、TCP 开放连接列表、运行进程列表、逻辑磁盘信息和本地用户账户信息,并将这些信息追加到输出文件中。

1.3 将 Autopsy 文本索引转换为可用的密码破解字典脚本

该脚本用于将 Autopsy 文本索引转换为可用的密码破解字典。

$filepath = Read-Host -Prompt "Enter full path to input file" 
$outpath = Read-Host -Prompt "Enter full path to output file"
#Read input file and split it so that every METADATA entry get its own array element
[string]$data = get-content -Path $filepath
[array]$new_data = $data.Split("------------------------------METADATA----------------
--------------")
#FOREACH for parsing and extracting text
foreach ($element in $new_data){
#Skip the parsing for the first element since it contains unwanted data
if($element -match "Lucene41PostingsWriter"){continue}
#Slipt the datablob on whitespace and some special characters. Hypens, dot etc, 
will be kept
[array]$words = $element -split "[^\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}\p{P}]+"
#controlfulction to only extract words containing actual non-whitepsace characters 
and that 
#are at least 4 characters long. Modify the three to change the lenght treshhold
foreach($word in $words){
if($word -match "\w" -and $word.Length -gt 3) {
#Append selected words to a file containing one word per row      
Out-File -FilePath $outpath -InputObject $word -Append
} 
} 
} 

操作步骤如下:
1. 运行脚本后,依次输入输入文件的完整路径和输出文件的完整路径。
2. 脚本将读取输入文件,将其按“METADATA”分割成数组元素。
3. 跳过第一个包含无用数据的元素,对其余元素进行处理。
4. 将每个元素按空格和一些特殊字符分割成单词数组。
5. 筛选出包含实际非空白字符且长度至少为 4 的单词,并将这些单词追加到输出文件中,每个单词占一行。

1.4 解析 Jitsi 聊天记录脚本

该脚本用于解析 Jitsi 聊天记录并以良好的格式输出。

#Script that parses jitsi chat logs and prints in a nice format.
#Note <msg> section needs to be cleaned to only include <msg> MESSAGE </msg> before 
usnig the script
#This can be done using serach and replace in some text editor
#Promt for input and output file paths and username of the local and remote char 
accounts
$path = Read-Host "Enter path to source file: "
$outpath = Read-Host "Enter path, including filename, to output file: "
$local = Read-Host "Enter the local username: "
$remote = Read-Host "Enter remote username: "
#Initiate arrays used later
$messages = @()
$messages_tidy = @()
#Import chat log content into a XML object, then slelect specific obejcts of interest
[xml]$chatlog = Get-Content $path
$chatlog.history.record | %{$messages += $_.dir + ";" + $_.msg + ";" +  $_.timestamp}
#Replace in and out keywords width actual usernames
foreach($index in $messages){
if($index -like "out*"){
[regex]$pattern = "out"
$messages_tidy += $pattern.replace($index,$local, 1) 
} 
elseif($index -like "in*"){
[regex]$pattern = "in"
$messages_tidy += $pattern.replace($index, $remote, 1)
} 
} 
#Ensure that no messages gets lost in the process...
if($messages.Length -ne $messages_tidy.Length){
echo "Some message seems missing, exiting now......"
break;
} 
#Write a headerrow and then output chat messaged to the outputfile.
$header = "Sender;Message;Timestamp"
Out-File -FilePath $outpath -InputObject $header
foreach($message in $messages_tidy){
Out-File -FilePath $outpath -InputObject $message -Append
}

操作步骤如下:
1. 在使用脚本之前,使用文本编辑器的搜索和替换功能清理 <msg> 部分,使其只包含 <msg> MESSAGE </msg>
2. 运行脚本后,依次输入源文件的路径、输出文件的路径(包括文件名)、本地用户名和远程用户名。
3. 脚本将导入聊天记录内容到 XML 对象中,提取感兴趣的信息并存储在 $messages 数组中。
4. 将 $messages 数组中的“in”和“out”关键字替换为实际的用户名,存储在 $messages_tidy 数组中。
5. 检查是否有消息丢失,如果有则退出脚本。
6. 向输出文件写入标题行“Sender;Message;Timestamp”,然后将 $messages_tidy 数组中的消息逐行追加到输出文件中。

2. 计算机取证案例分析
2.1 案例背景

本次案例的目的是确定在线欺诈广告中使用的图片是否存在于目标计算机中,并分析这些图片是如何被使用的以及是否可以与嫌疑人关联起来。

2.2 案例信息
  • 请求方 :Peregrin Took
  • 首席法医调查员 :Joakim Kävrestad
  • 调查原因 :识别欺诈广告中的图片是否与计算机和/或嫌疑人相关联
  • 调查时间 :2018 年 5 月 14 日至 2018 年 5 月 17 日
  • 额外信息 :嫌疑人声称广告中的图片可能是由于他使用计算机浏览这些广告而存在于计算机中的
2.3 调查结果
  • 图片存在情况 :通过哈希查找,发现广告中使用的所有图片都存在于计算机的“C:\PICS”文件夹中,图片名称包括“Jacket.jpg”、“Shoes.jpg”和“Merrys awesome sword.jpg”。这些图片被提取并通过 DVD 交付给调查员。
  • EXIF 数据 :从找到的图片中提取的 EXIF 数据显示,所有图片都是使用 iPhone X 拍摄的,并且拍摄地点的 GPS 坐标与嫌疑人的家庭地址相近。具体的 GPS 坐标为:
  • 纬度:68.27211388888889
  • 经度:23.715005555555555
  • 海拔:168.26573426573427
  • Windows 注册表 :对 Windows 注册表的检查显示,计算机曾用于打开这些图片,具体的注册表项为“Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\jpg”。
2.4 结论
  • 图片存在性 :分析表明,广告中的图片确实存在于计算机中。
  • 嫌疑人说法的合理性 :嫌疑人声称图片是由于浏览广告而存储在计算机中的,但“C:\PICS”不是浏览器下载图片通常存储的临时文件夹,并且注册表分析显示图片曾被打开过,因此嫌疑人的说法无法解释图片是如何被放置在计算机中的。
  • 图片来源 :EXIF 数据显示图片拍摄地点与嫌疑人家庭地址相近,并且使用的相机型号与嫌疑人的手机相同,这表明图片很可能是嫌疑人使用自己的手机拍摄的。
3. 时间区域列表

以下是常见的时间区域列表:
| 时间区域名称 | 时间 |
| — | — |
| Dateline Standard Time | (GMT−12:00) International Date Line West |
| Samoa Standard Time | (GMT−11:00) Midway Island, Samoa |
| Hawaiian Standard Time | (GMT−10:00) Hawaii |
| Alaskan Standard Time | (GMT−09:00) Alaska |
| Pacific Standard Time | (GMT−08:00) Pacific Time (USA and Canada); Tijuana |
| Mountain Standard Time | (GMT−07:00) Mountain Time (USA and Canada) |
| Mexico Standard Time 2 | (GMT−07:00) Chihuahua, La Paz, Mazatlan |
| US Mountain Standard Time | (GMT−07:00) Arizona |
| Central Standard Time | (GMT−06:00) Central Time (USA and Canada) |
| Canada Central Standard Time | (GMT−06:00) Saskatchewan |
| Mexico Standard Time | (GMT−06:00) Guadalajara, Mexico City, Monterrey |
| Central America Standard Time | (GMT−06:00) Central America |
| Eastern Standard Time | (GMT−05:00) Eastern Time (USA and Canada) |
| US Eastern Standard Time | (GMT−05:00) Indiana (East) |
| S.A. Pacific Standard Time | (GMT−05:00) Bogota, Lima, Quito |
| Atlantic Standard Time | (GMT−04:00) Atlantic Time (Canada) |
| S.A. Western Standard Time | (GMT−04:00) Caracas, La Paz |
| Pacific S.A. Standard Time | (GMT−04:00) Santiago |
| Newfoundland and Labrador Standard Time | (GMT−03:30) Newfoundland and Labrador |
| E. South America Standard Time | (GMT−03:00) Brasilia |
| S.A. Eastern Standard Time | (GMT−03:00) Buenos Aires, Georgetown |
| Greenland Standard Time | (GMT−03:00) Greenland |
| Mid-Atlantic Standard Time | (GMT−02:00) Mid-Atlantic |
| Azores Standard Time | (GMT−01:00) Azores |
| Cape Verde Standard Time | (GMT−01:00) Cape Verde Islands |
| GMT Standard Time | (GMT) Greenwich Mean Time: Dublin, Edinburgh, Lisbon, London |
| Greenwich Standard Time | (GMT) Casablanca, Monrovia |
| Central Europe Standard Time | (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague |
| Central European Standard Time | (GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb |
| Romance Standard Time | (GMT+01:00) Brussels, Copenhagen, Madrid, Paris |
| W. Europe Standard Time | (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna |
| W. Central Africa Standard Time | (GMT+01:00) West Central Africa |
| E. Europe Standard Time | (GMT+02:00) Bucharest |
| Egypt Standard Time | (GMT+02:00) Cairo |
| FLE Standard Time | (GMT+02:00) Helsinki, Kiev, Riga, Sofia, Tallinn, Vilnius |
| GTB Standard Time | (GMT+02:00) Athens, Istanbul, Minsk |
| Israel Standard Time | (GMT+02:00) Jerusalem |
| South Africa Standard Time | (GMT+02:00) Harare, Pretoria |
| Russian Standard Time | (GMT+03:00) Moscow, St. Petersburg, Volgograd |
| Arab Standard Time | (GMT+03:00) Kuwait, Riyadh |
| E. Africa Standard Time | (GMT+03:00) Nairobi |
| Arabic Standard Time | (GMT+03:00) Baghdad |
| Iran Standard Time | (GMT+03:30) Tehran |
| Arabian Standard Time | (GMT+04:00) Abu Dhabi, Muscat |
| Caucasus Standard Time | (GMT+04:00) Baku, Tbilisi, Yerevan |
| Transitional Islamic State of Afghanistan Standard Time | (GMT+04:30) Kabul |
| Ekaterinburg Standard Time | (GMT+05:00) Ekaterinburg |
| West Asia Standard Time | (GMT+05:00) Islamabad, Karachi, Tashkent |
| India Standard Time | (GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi |
| Nepal Standard Time | (GMT+05:45) Kathmandu |
| Central Asia Standard Time | (GMT+06:00) Astana, Dhaka |
| Sri Lanka Standard Time | (GMT+06:00) Sri Jayawardenepura |
| N. Central Asia Standard Time | (GMT+06:00) Almaty, Novosibirsk |
| Myanmar Standard Time | (GMT+06:30) Yangon Rangoon |
| S.E. Asia Standard Time | (GMT+07:00) Bangkok, Hanoi, Jakarta |
| North Asia Standard Time | (GMT+07:00) Krasnoyarsk |
| China Standard Time | (GMT+08:00) Beijing, Chongqing, Hong Kong SAR, Urumqi |
| Singapore Standard Time | (GMT+08:00) Kuala Lumpur, Singapore |
| Taipei Standard Time | (GMT+08:00) Taipei |
| W. Australia Standard Time | (GMT+08:00) Perth |
| North Asia East Standard Time | (GMT+08:00) Irkutsk, Ulaanbaatar |
| Korea Standard Time | (GMT+09:00) Seoul |
| Tokyo Standard Time | (GMT+09:00) Osaka, Sapporo, Tokyo |
| Yakutsk Standard Time | (GMT+09:00) Yakutsk |
| A.U.S. Central Standard Time | (GMT+09:30) Darwin |
| Cen. Australia Standard Time | (GMT+09:30) Adelaide |
| A.U.S. Eastern Standard Time | (GMT+10:00) Canberra, Melbourne, Sydney |
| E. Australia Standard Time | (GMT+10:00) Brisbane |
| Tasmania Standard Time | (GMT+10:00) Hobart |
| Vladivostok Standard Time | (GMT+10:00) Vladivostok |
| West Pacific Standard Time | (GMT+10:00) Guam, Port Moresby |
| Central Pacific Standard Time | (GMT+11:00) Magadan, Solomon Islands, New Caledonia |
| Fiji Islands Standard Time | (GMT+12:00) Fiji Islands, Kamchatka, Marshall Islands |
| New Zealand Standard Time | (GMT+12:00) Auckland, Wellington |
| Tonga Standard Time | (GMT+13:00) Nuku’alofa |

4. 完整的 Jitsi 聊天记录示例

以下是一个完整的 Jitsi 聊天记录示例:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<history>
<record timestamp="2017-06-27T13:16:07.826+0200">
<dir>in</dir>
<msg><![CDATA[zup_]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149856217370418137890</uid>
<receivedTimestamp>2017-06-27T13:16:07.260+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-27T13:16:21.179+0200">
<dir>out</dir>
<msg><![CDATA[kollar lite affärer….sj?]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149856218114519064878</uid>
<receivedTimestamp>2017-06-27T13:16:21.149+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-27T13:16:42.293+0200">
<dir>in</dir>
<msg><![CDATA[samma, lurar p[ vad som ar vart att salja..]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149856220870413141993</uid>
<receivedTimestamp>2017-06-27T13:16:42.259+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-27T13:16:52.792+0200">
<dir>out</dir>
<msg><![CDATA[hur säkrar du?]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149856221278425383895</uid>
<receivedTimestamp>2017-06-27T13:16:52.785+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-27T13:17:20.785+0200">
<dir>in</dir>
<msg><![CDATA[kor engelsk dator, svart lista ut vart jag ar!]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149856224722021689995</uid>
<receivedTimestamp>2017-06-27T13:17:20.774+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-27T13:17:30.963+0200">
<dir>out</dir>
<msg><![CDATA[tror inte det funkar, ,lira tor!]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149856225095331490715</uid>
<receivedTimestamp>2017-06-27T13:17:30.955+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-27T13:17:46.289+0200">
<dir>in</dir>
<msg><![CDATA[har kollat pa det, vet inte, krangligt!]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>14985622727203437744</uid>
<receivedTimestamp>2017-06-27T13:17:46.272+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-27T13:18:16.749+0200">
<dir>out</dir>
<msg><![CDATA[vi får se…., ska ut o köra nu]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>14985622967401999847</uid>
<receivedTimestamp>2017-06-27T13:18:16.741+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-27T13:18:22.691+0200">
<dir>in</dir>
<msg><![CDATA[k thx bye]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>14985623091289998450</uid>
<receivedTimestamp>2017-06-27T13:18:22.680+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T09:25:10.619+0200">
<dir>in</dir>
<msg><![CDATA[hade din konakt winky eller?]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872111183323157419</uid>
<receivedTimestamp>2017-06-29T09:25:10.584+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T09:25:16.007+0200">
<dir>out</dir>
<msg><![CDATA[ring]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>14987211160015132863</uid>
<receivedTimestamp>2017-06-29T09:25:16.003+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:28:56.442+0200">
<dir>in</dir>
<msg><![CDATA[lol,
din
gubbe
ville
att
jag
ska
be-
tala till polen, tror du detta funkar för att göra bakkoton?]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872852804633135586</uid>
<receivedTimestamp>2017-06-29T11:29:00.000+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:29:19.585+0200">
<dir>out</dir>
<msg><![CDATA[hallå SKICKA INTE SÅNT!]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872855956733289131</uid>
<receivedTimestamp>2017-06-29T11:29:19.576+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:29:28.633+0200">
<dir>out</dir>
<msg><![CDATA[men ja…..idiot!]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872856862214632876</uid>
<receivedTimestamp>2017-06-29T11:29:28.625+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:29:38.044+0200">
<dir>out</dir>
<msg><![CDATA[lugn, jag shreddar den]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>14987285780318102467</uid>
<receivedTimestamp>2017-06-29T11:29:38.034+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:30:13.642+0200">
<dir>in</dir>
<msg><![CDATA[rätt najs väder hos hemma!]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872861126430554666</uid>
<receivedTimestamp>2017-06-29T11:30:13.633+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:31:09.292+0200">
<dir>out</dir>
<msg><![CDATA[gött, ordning på saker?]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>14987286692808427856</uid>
<receivedTimestamp>2017-06-29T11:31:09.284+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:31:18.105+0200">
<dir>in</dir>
<msg><![CDATA[visst, rullar på karnekegränd!]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872867571729818420</uid>
<receivedTimestamp>2017-06-29T11:31:18.096+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:31:28.658+0200">
<dir>out</dir>
<msg><![CDATA[kasnke vi ska slå samman?]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872868864331461466</uid>
<receivedTimestamp>2017-06-29T11:31:28.648+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:31:40.794+0200">
<dir>in</dir>
<msg><![CDATA[får se, bra o ha ensam buisness]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>14987286984212875993</uid>
<receivedTimestamp>2017-06-29T11:31:40.786+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:43:25.330+0200">
<dir>in</dir>
<msg><![CDATA[lol på bilerna på dig me mina saker…ser ganster ut]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872940290527785517</uid>
<receivedTimestamp>2017-06-29T11:43:25.322+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:43:45.855+0200">
<dir>out</dir>
<msg><![CDATA[haha idd, du hade av metadata på kameran va?]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872942584328989997</uid>
<receivedTimestamp>2017-06-29T11:43:45.847+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-29T11:43:55.456+0200">
<dir>in</dir>
<msg><![CDATA[lol ja e la inte dum eller, altid AV1]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149872943303024228041</uid>
<receivedTimestamp>2017-06-29T11:43:55.448+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-30T10:07:32.788+0200">
<dir>in</dir>
<msg><![CDATA[fixa mer winks]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149881004661110933177</uid>
<receivedTimestamp>2017-06-30T10:07:32.777+0200</receivedTimestamp>
</record>
<record timestamp="2017-06-30T10:07:38.409+0200">
<dir>out</dir>
<msg><![CDATA[kom fort]]></msg>
<msgTyp>text/plain</msgTyp>
<enc>UTF-8</enc>
<uid>149881005839726360958</uid>
<receivedTimestamp>2017-06-30T10:07:38.398+0200</receivedTimestamp>
</record>
</history>

通过以上脚本和案例分析,我们可以看到在计算机取证过程中,脚本的使用能够帮助我们更高效地获取和分析相关信息,为案件的侦破提供有力的支持。同时,对案例的详细分析也有助于我们更好地理解如何运用这些技术手段来解决实际问题。在实际应用中,我们可以根据具体的需求选择合适的脚本,并结合相关的工具和技术进行深入的调查和分析。

计算机取证实用脚本与案例分析

5. 脚本使用流程总结

为了更清晰地展示各个脚本的使用流程,下面用 mermaid 流程图来呈现:

graph LR
    classDef startend fill:#F5EBFF,stroke:#BE8FED,stroke-width:2px
    classDef process fill:#E5F6FF,stroke:#73A6FF,stroke-width:2px
    classDef decision fill:#FFF6CC,stroke:#FFBC52,stroke-width:2px

    A([开始]):::startend --> B{选择脚本类型}:::decision
    B -->|MAC 和 Linux 系统基本信息捕获脚本| C(以提升权限运行脚本):::process
    C --> D(输入输出文件名):::process
    D --> E{是否添加案例数据?}:::decision
    E -->|是| F(输入案例编号、证据编号等):::process
    E -->|否| G(脚本自动收集信息并保存到输出文件):::process
    F --> G
    B -->|Windows 系统基本信息捕获脚本| H(运行脚本,输入输出文件完整路径):::process
    H --> I(脚本自动收集信息并追加到输出文件):::process
    B -->|将 Autopsy 文本索引转换为可用的密码破解字典脚本| J(运行脚本,输入输入文件和输出文件完整路径):::process
    J --> K(脚本读取输入文件并处理):::process
    K --> L(筛选单词并追加到输出文件):::process
    B -->|解析 Jitsi 聊天记录脚本| M(清理 <msg> 部分):::process
    M --> N(运行脚本,输入源文件路径、输出文件路径等):::process
    N --> O(脚本导入聊天记录到 XML 对象):::process
    O --> P(替换关键字,检查消息是否丢失):::process
    P -->|无丢失| Q(写入标题行并追加消息到输出文件):::process
    P -->|有丢失| R([退出脚本]):::startend
    Q --> S([结束]):::startend
    G --> S
    I --> S
    L --> S

这个流程图清晰地展示了不同脚本的使用步骤和流程,方便在实际操作中参考。

6. 计算机取证的重要性和挑战
6.1 重要性

计算机取证在当今数字化时代具有极其重要的意义。随着信息技术的飞速发展,越来越多的犯罪活动涉及到计算机和网络,如网络诈骗、数据泄露、知识产权侵权等。计算机取证能够帮助执法机构和调查人员获取关键的电子证据,还原事件的真相,为案件的侦破和定罪提供有力的支持。例如,在上述案例中,通过对计算机中图片的取证分析,确定了图片与嫌疑人的关联,为案件的调查提供了重要线索。

6.2 挑战

然而,计算机取证也面临着诸多挑战。首先,数据的海量性和复杂性使得取证工作变得困难。现代计算机系统中存储着大量的数据,如何从这些数据中筛选出与案件相关的信息是一个巨大的挑战。其次,犯罪分子可能会采取各种手段来销毁或篡改电子证据,如加密、删除文件等,这增加了取证的难度和成本。此外,不同操作系统和软件的差异性也给取证工作带来了一定的困难,需要取证人员具备丰富的知识和经验。

7. 应对挑战的策略
7.1 数据筛选和分析

为了应对数据的海量性和复杂性,可以采用数据筛选和分析工具。例如,使用哈希查找技术可以快速定位特定的文件,减少不必要的数据处理。同时,利用数据挖掘和机器学习算法可以对数据进行分类和分析,提高取证的效率和准确性。

7.2 证据保护和恢复

为了防止证据被销毁或篡改,在取证过程中需要采取严格的证据保护措施。例如,对计算机系统进行镜像备份,确保原始数据的完整性。此外,还可以使用数据恢复工具来恢复被删除或损坏的文件,尽可能获取更多的证据。

7.3 技术培训和知识更新

由于计算机技术的不断发展,取证人员需要不断更新自己的知识和技能。可以通过参加专业培训课程、研讨会和阅读相关文献等方式,了解最新的取证技术和方法,提高自己的专业水平。

8. 总结与展望

通过对上述实用脚本和案例的分析,我们可以看到计算机取证在解决实际问题中发挥着重要的作用。这些脚本能够帮助取证人员更高效地获取和分析电子证据,为案件的侦破提供有力的支持。同时,我们也认识到计算机取证面临着诸多挑战,需要采取相应的策略来应对。

未来,随着信息技术的不断发展,计算机取证技术也将不断创新和完善。例如,人工智能和大数据技术的应用将使得取证工作更加智能化和高效化。同时,随着物联网和云计算的普及,计算机取证的范围也将不断扩大,涉及到更多的设备和数据。我们需要不断关注这些发展趋势,积极探索新的取证技术和方法,以适应不断变化的取证需求。

在实际应用中,我们应该根据具体的案件情况选择合适的脚本和技术手段,结合专业的知识和经验,进行全面、深入的调查和分析。同时,要严格遵守相关的法律法规和取证程序,确保证据的合法性和有效性。相信在不断的努力和探索下,计算机取证技术将为维护社会的公平正义和安全稳定做出更大的贡献。

评论
成就一亿技术人!
拼手气红包6.0元
还能输入1000个字符  | 博主筛选后可见
 
红包 添加红包
表情包 插入表情
 条评论被折叠 查看
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值