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Running Windows Malware in Linux

Monday, February 23, 2009 at 1:52pm by Archive
Archive

For the unaware, Wine is an application that enables users to run Windows applications on Unix-like computers. Like many users, I use Wine on my Linux machine to run a couple of Windows applications I cannot do without. I could run these applications on a virtual machine, or even dual-boot with Windows and Linux, but running them in Wine is just easier.

Although running Windows applications in Wine has its advantages, it also comes at a price: bringing Windows malware into Linux. I’m aware that it isn’t Wine’s responsibility to distinguish between a malicious and a nonmalicious file, and that Wine shouldn’t have any problem running a malicious file; however, I had this morbid curiosity to see how well today’s malware would fare running on Wine, and so began an experiment using the following setup:

  • Ubuntu Linux 8.04 [comes with Gnome desktop environment]
  • Wine 1.0 [run as a nonroot user with default settings]

I decided to choose samples that displayed a cocktail of malicious behavior, and so I chose the following:

File Infectors

W32/Philis is a file infector that apart from appending its code to other executables downloads and drops other malware.

This malware ran without throwing any errors in Wine. It immediately dropped files in the “Windows” and “Windows\System32″ folders and executed these dropped files. It then attempted to connect to a preconfigured site, and downloaded more malware successfully. It also began infecting executables in the Wine directory and created a registry run key for the malicious file.

The screenshot below shows the clean “CProcess.ori,” the original file 35KB in size, and “CProcess.vir,” the infected file 131KB in size.

It’s worth mentioning that the autostart registry key the file infector created will not work under Wine, so applications will not be able to autostart when the Linux machine is booted up. Also, this file infector didn’t seem to infect ELF files. But I’m guessing that a file infector that blindly appends/prepends its code to other files shouldn’t have any problem corrupting ELF files.

Autorun Malware

W32/Autorun.Worm.CP is an autorun worm, which drops autorun.inf in the root of removable drives.

This malware also ran without any errors. It dropped both the malicious files and the associated autorun.inf file in the C:\ drive and attached removable devices, and created a registry run key.

The screenshot below shows the created Autorun.inf file, along with the malicious files that were created in the root of the removable device.

The registry run key created by the malware won’t work in Wine, however. As long as the malicious file is running, any new removable devices connected to the machine will get infected, thus making a Linux machine the origin of an infection.

Although it is difficult for malware to autostart in Wine, it is not impossible. Malware can be written to find out if it is running in Wine. It can then either download a Linux binary onto the machine and/or simply add an autostart entry for itself in the Linux desktop environment’s common autostart locations, using the nonroot user’s credentials.

IRC Trojans

IRC/Contact malware drops files and connects to a preconfigured IRC server. This IRC Trojan, when ran in Wine, connected to the preconfigured IRC server. From the IRC server I was able to connect to the bot, and control it. Though the control was limited, I was still able to list the files under the Wine directory, get system information, download files to the Linux machine remotely, etc.

The screen shot below shows my logging into the infected Linux machine and issuing commands:

Click here for larger version of the image.

The screen shot below shows the infected machine responding to the “getinfo” command issued from the IRC channel:

Click here for a larger version of the image.

This IRC Trojan was very simple in features, but I’m guessing that with a complex one, an attacker shouldn’t have any problem scanning the subnet for an exploit and sending a payload to infect Windows machines.

Keyloggers/Password Stealers

Apart from this, I tried running a couple of password stealers and keyloggers, but I couldn’t find one that worked well. I’m guessing they couldn’t get a hook to the keyboard.

Although stealing information using a Windows malware in Wine is difficult, an infected Linux machine can still contribute to a DOS attack or be the origin of an infection as suggested earlier.

Scareware

This class of malware displays falsely exaggerated scan reports and tricks users into buying them. They utilize extreme social-engineering tactics combined with obfuscated Java scripts that check for exploits on the machine.

Although I didn’t run the Scareware installer in Wine, I did browse through a site that ran a JavaScript to pop up a window informing me that my “Windows” machine was infected, and requested that I install the malicious file.

Screen shots below:

Click here for a larger screen shot.

It is important to note that if the user had set the file association for Windows executables with Wine, then simply double-clicking the downloaded file would run the malware.

Mitigation Techniques

  • Never run Wine applications as root.
  • Wine maps the root directory, the user’s home directory, CD ROMs and removable devices found, and these mappings are listed in “~/.wine/dosdevices/”. Consider deleting these except the link to your drive_c.
  • Do not set the file association for Windows executables with Wine. This would enable the running of Windows executables in Wine by simply double-clicking them.
  • Administrators should think twice before installing Wine on a Linux server. These machines are seldom turned off, and so the problem that a malware faces in Wine with respect to autostarting its code when the machine boots up, I mentioned this earlier, would become void.
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