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Doctor Web has announced the massive spread of a dangerous network worm Win32.HLLW.Shadow.based, which uses several alternative methods of infecting computers, one of which is the exploitation of vulnerabilities in operating systems from Windows 2000 to the beta of Windows 7. To package your Win32 files.HLLW.Shadow.based uses a polymorphic (constantly changing) packer, which makes it difficult to detect using conventional methods.

Distribution methods

Win32 network worm.HLLW.Shadow.based (some samples of which can also be detected by Dr.Web as Win32.HLLW.Autorunner.5555), uses several methods for its distribution at once. First of all, through the built-in operating system autorun mechanism for removable media and network drives. In this case, the name of the malicious file is pseudo-random, and it itself is contained in a folder like "RECYCLER \\ S-x-x-xx-xxxxxxxxxx-xxxxxxxxxx-xxxxxxxxx-xxxx". The same folder structure is used in Windows to store deleted objects, which allows the virus to remain invisible to the user for a long time.

In addition, the worm can spread over a network using the SMB protocol, which is standard for Windows networks. At the same time, to organize remote access to a Win32 computer.HLLW.Shadow.based enumerates the most common ways to set a password, as well as options from its dictionary. In case of a positive result, the worm copies itself to the system folder of the victim computer and creates a task to launch after a certain period of time.

Another option for a virus to spread over the network is to exploit a vulnerability eliminated by the critical Microsoft update MS08-067. A specially crafted request is sent to the target computer resulting in a system buffer overflow. As a result of these actions, the victim computer downloads a malicious file via the HTTP protocol.

Actions to be taken after the virus is launched

After starting Win32.HLLW.Shadow.based checks what process it is in. If it is a rundll32 process.exe, then the virus code is injected into the system processes svchost.exe and explorer.exe. Then the worm opens the current folder in Explorer and terminates its work.

If Win32.HLLW.Shadow.based defines what is not in rundll32 process.exe, then it creates a copy of itself with a random name and registers it as a Windows service, makes changes to the registry to ensure that it starts automatically after restarting the computer, and also stops the Windows update service. Next, you install your own HTTP server, with which the further spread of the infection over the network begins.

If a virus detects what is in the svchost process.exe running as a DNS client, then it injects its code into the DNS functions on the computer, thereby blocking access to the websites of many antivirus companies.

Included in Win32.HLLW.Shadow.based includes a driver that modifies the tcpip system file in memory.sys in order to remove the standard system restrictions on the number of simultaneous network connections.

Win32 Purpose.HLLW.Shadow.based

This malicious program was created with the aim of forming another botnet. During the operation of the virus, requests are made to download executable files from special servers, install and run these programs on computers of the botnet. The goal of criminals can be either to independently extract profit from the built botnet, or to sell it. Unfortunately, there is currently no shortage of demand for such working networks.

The procedure for treating the system from Win32.HLLW.Shadow.based and measures to prevent such infection methods

  • Download the current version of the Dr utility.Web CureIt! from an uninfected computer and scan all disks, thereby curing the system.
  • Disconnect the infected computer from the local network and from the Internet. If all PCs are on the same local network, then the disinfected computer must be reconnected only after all infected stations have been disinfected.
  • Install the patches identified in the following Microsoft newsletters:
    • MS08-067
    • MS08-068
    • MS09-001

    To prevent the spread of viruses, it is recommended to disable the autorun of programs from removable media on computers, use automatic Windows updates, and do not use simple passwords to log on to the system.

    Dr Antivirus Features.Web to counter Win32.HLLW.Shadow.based

    Since the Win32 network worm.HLLW.Shadow.based sets security attributes on its files and registry branches using Windows tools in such a way that it becomes impossible to read them by standard means, then the system can be cured of this virus only with the Dr scanner.Web for Windows with GUI version 4 or higher.44. In these versions of the Dr.Web anti-rootkit module Dr.Web Shield, which allows you to get unlimited access to protected files and registry branches.

    SpIDer Guard file monitor included in Dr antivirus.Web for Windows version 4.44 and 5.0, when using the latest virus database updates, successfully counteracts all attempts by Win32.HLLW.Shadow.based to penetrate the system.

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