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WORM_NETSPREE.C

Malware type: Worm

Aliases: Backdoor.Win32.Subus.a (Kaspersky), W32/Netspree.worm (McAfee), W32.Netspree.Worm (Symantec), BDS/Subus.A (Avira), Mal/Behav-167 (Sophos), Backdoor:Win32/Subus (Microsoft)

In the wild: No

Destructive: No

Language: English

Platform: Windows 95, 98, ME, NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

This worm propagates via network shares, specifically the Interprocess Communication Share, or IPC$. It accesses this share by using a list of user name and password combinations found in one of its components, named RUN32.BAT.

To drop a copy of itself on a remote machine, it uses a legitimate application named PSEXEC.EXE, which is a tool used for remote execution of applications.

This malware also has backdoor capabilities, which enables it to connect to a remote machine via port 6667, and listen for commands from a remote user.

It runs on Windows 95, 98, ME, NT, 2000 and XP.

For additional information about this threat, see:

Description created: Apr. 8, 2004 5:27:54 PM GMT -0800
Description updated: Dec. 4, 2004 5:12:23 AM GMT -0800


Minimum scan engine version needed: 6.500

Pattern file needed: 2.282.02

Pattern release date: Apr 8, 2004


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Identifying the Malware Program

Before proceeding to remove this malware, first identify the malware program.

Scan your system with Trend Micro antivirus and NOTE all files detected as WORM_NETSPREE.C. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro's free online virus scanner.

Terminating the Malware Program

This procedure terminates the running malware process from memory. You will need the name(s) of the file(s) detected earlier.

  1. Open Windows Task Manager.
    On Windows 95/98/ME systems, press
    CTRL+ALT+DELETE
    On Windows NT/2000/XP systems, press
    CTRL+SHIFT+ESC, then click the Processes tab.
  2. In the list of running programs*, locate the malware file or files detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. Do the same for all detected malware files in the list of running processes.
  5. To check if the malware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

*NOTE: On systems running Windows 95/98/ME, Task Manager may not show certain processes. You may use a third party process viewer to terminate the malware process. Otherwise, continue with the next procedure, noting additional instructions.

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing during startup.

  1. Open Registry Editor. To do this, click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry or entries:
    Windows Subsys="%System%\winload.exe"
    rundll32.dll,loadsubsys,loadwin32,loadsys,win32
    Note: %System% is the Windows system directory, which is usually C:\Windows\System or C:\WINNT\System32.
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>RunServices
  5. In the right panel, locate and delete the entry or entries:
    Windows Subsys="%System%\winload.exe"
    rundll32.dll,loadsubsys,loadwin32,loadsys,win32
  6. Close Registry Editor.

NOTE: If you were not able to terminate the malware process from memory as described in the previous procedure, restart your system.

Additional Windows ME/XP Cleaning Instructions

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_NETSPREE.C. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micros free online virus scanner.


Trend Micro offers best-of-breed antivirus and content-security solutions for your corporate network, small and medium business, mobile device or home PC.