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In the Hacking Windows 95, part 1 blog post, we covered that through a nasty bug affecting Windows 95/98/ME, the share password can be guessed in no time. In this article, I'm going to try to use this vulnerability to achieve remote code execution (with the help of publicly available tools only).

The first thing we can do when we have read access to the Windows directory through the share, is to locate all the *.pwl files on the c:\windows directory, copy them to your machine where Cain is installed, switch to Cracker tab, pwl files, load the pwl file, add username based on the filename, and try to crack it. If you can't crack it you might still try to add a .pwl file where you already know the password in the remote windows directory. Although this is a fun post-exploitation task, but still, no remote code execution. These passwords are useless without physical access.

One might think that after having a share password and user password, it is easy to achieve remote code execution. The problem is:

there is no "at" command (available since Windows 95 plus!)
there is no admin share
there is no RPC
there is no named pipes
there is no remote registry
there is no remote service management

If you think about security best practices, disabling unnecessary services is always the first task you should do. Because Windows 95 lacks all of these services, it is pretty much secure!

During my quest for a tool to hack Windows 95, I came across some pretty cool stuff:

Internet periscope

Winfingerprint

LanSpy

But the best of the best is Fluxay, which has been written by chinese hackers. It is the metasploit from the year 2000. A screenshot is worth more than a 1000 words. 4 screenshot > 4 thousand words :)

It is pretty hard to find the installer, but it is still out there!

But at the end, no remote code execution for me.

My idea here was that if I can find a file which executes regularly (on a scheduled basis), I can change that executable to my backdoor and I'm done. Although there is no scheduler in the default Windows 95, I gave it a try.

Let's fire up taskman.exe to get an idea what processes are running:

Looks like we need a more powerful tool here, namely Process Explorer. Let's try to download this from oldapps.com:

LOL, IE3 hangs, can't render the page. Copying files to the Win95 VM is not that simple, because there are no shared folders in Win95 VM. And you can't use pendrives either, Win95 can't handle USB (at least the retail version). After downloading the application with a newer browser from oldapps, let's start Process Explorer on the test Windows 95.

Don't try to download the Winsocks 2 patch from the official MS site, it is not there anymore, but you can download it from other sites.

Now let's look at the processes running:

After staring it for minutes, turned out it is constant, no new processes appeared.
Looking at the next screenshot, one can notice this OS was not running a lot of background processes ...

My current Win7 has 1181 threads and 84 processes running, no wonder it is slow as hell :)

We have at least the following options:

You are lucky and not the plain Windows 95 is installed, but Windows 95 Plus! The main difference here is that Windows 95 Plus! has built-in scheduler, especially the "at" command. Just overwrite a file which is scheduled to execution, and wait. Mission accomplished!
Ping of death - you can crash the machine (no BSOD, just crash) with long (over 65535 bytes) ICMP ping commands, and wait for someone to reboot it. Just don't forget to put your backdoor on the share and add it to autoexec.bat before crashing it.
If your target is a plain Windows 95, I believe you are out of luck. No at command, no named pipes, no admin share, nothing. Meybe you can try to fuzz port 137 138 139, and write an exploit for those. Might be even Ping of Death is exploitable?

Let's do the first option, and hack Windows 95 plus!

Look at the cool features we have by installing Win95 Plus!

Cool new boot splash screen!

But our main interest is the new, scheduled tasks!

Now we can replace diskalm.exe with our backdoor executable, and wait maximum one hour to be scheduled.

Instead of a boring text based tutorial, I created a YouTube video for you. Based on the feedbacks on my previous tutorialz, it turned out I'm way too old, and can't do interesting tutorials. That's why I analyzed the cool skiddie videoz, and found that I have to do the followings so my vidz won't suck anymore:

use cool black windows theme
put meaningless performance monitor gadgets on the sidebar
use a cool background, something related with hacking and skullz
do as many opsec fails as possible
instead of captions, use notepad with spelling errorz
there is only one rule of metal: Play it fuckin' loud!!!!

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Important Run Commands Every Windows User Should Know

1. %temp%

This is the fastest way to clear the temporary files from your computer. It can save a lot of space which was being wasted by temporary files.

2. cmd

This command will open the windows DOS command prompt. Windows command prompt is very useful for performing many tasks which are not possible using graphical user interface.

3. MSConfig

Windows Run Command - MSconfig-compressed

Windows System Configuration

This command will open Windows System Configuration where you can edit different things like the boot options, startup options, services, etc.

4. sysdm.cpl

Windows Run Command - sysdm cpl-compressed

System Properties window

This command will open the System Properties window, Where you can change the system protection and performance related many settings

5. Powershell

Powershell is very similar the command prompt. Just type this command in the Run dialog box, and you will have your PowerShell opened without administrator privileges.

6. perfmon.msc

Windows Run Command - perfmon msc-compressed

Windows System Performance monitor

This command can be used to monitor the performance of your computer. There are plenty of options for monitoring the system performance

7. regedit

Regedit Run command is used to open the Windows Registry. It is a hierarchical database that hosts all the configurations and settings of Windows operating system, it's users and the installed software.

8. \ (Backslash)

This is one of the lesser known Run commands. Just enter the backslash into the Run dialog box and it will open up the C drive. It is one of the quickest ways to access the C drive.

9. . (Dot)

This is yet another lesser known Run command. When executed, it opens the current user's home folder which hosts all the other local folders like the Downloads, Documents, Desktop, Pictures, etc.

10. .. (Double Dots)

When you execute these two dots in the Run dialog box, it will open up the Users folder which is located directly on the C drive

Also Read; Top 10 Great Gifts For Hackers

11. Control

This command will open the control panel. Control panel is used for managing all the system settings and programs

12. hdwwiz.cpl

Windows Device Manager

This command is used to open the Device Manager in Windows. You can manage all the device connected internally or externally to your PC.

13. Notepad

The quickest way to open notepad in Windows. Just type this command in Run Box and hit enter.

14. osk

This command will open On-Screen Keyboard on your display monitor. You can easily touch and type or use your mouse for typing.

15. taskmgr

This command will open task manager where you can manage all the processes and programs running on Windows Operating system.

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2020年8月29日星期六

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