Computing.Net > Forums > Windows XP > csrss.-smss.exe worm

Computer Problems? Computing.Net has over 1,000,000 posts about all things technology related! Over 90% answered within 24 hours! Click here to start participating now! Also, be sure to check out the New User Guide.

csrss.-smss.exe worm

Reply to Message Icon

Name: chunko
Date: December 17, 2002 at 00:34:15 Pacific
OS: windows xp home
CPU/Ram: Pentium2.4/256ddr333
Comment:

Does anybody know how to get rid of this worm? -And Im not talking abuot the system 32 application-



Sponsored Link
Ads by Google

Response Number 1
Name: Ubbe
Date: December 17, 2002 at 00:49:39 Pacific
Reply:

Hey.
Try this one.

http://securityresponse.symantec.com/avcenter/venc/data/w32.dalbug.worm.html


0

Response Number 2
Name: chunko
Date: December 17, 2002 at 00:58:53 Pacific
Reply:

please dont refer me to any sites! I have gone everywhere! I need someone who actually knows how to get rid of this.


0

Response Number 3
Name: Brian Rignall
Date: December 17, 2002 at 02:02:28 Pacific
Reply:

This is from Symantec's page: but as you want the instructions here they are: read to the end of this posting.

W32.Dalbug.Worm
Discovered on: July 08, 2002
Last Updated on: July 09, 2002 08:43:25 AM

W32.Dalbug.Worm will only replicate under NT/2000/XP systems. It spreads by attacking computers that have open user accounts and shares, installing itself remotely as a service on the victim's computer.

NOTE: Definitions dated prior to July 9, 2002 will detect this as WNT.YdalBug.Worm.

Type: Worm
Infection Length: 28,672 bytes, 274,432 bytes
Systems Affected: Windows NT, Windows 2000, Windows XP, Microsoft IIS
Systems Not Affected: Windows 3.x, Windows 95, Windows 98, Windows Me, Macintosh, UNIX, Linux

When breaking into a remote computer, W32.Dalbug.Worm attempts to open the computer's Service Control Manager. If successful, it will install itself on the remote computer as a service.

W32.Dalbug.Worm then copies itself as %windir%\System32\lmhsvc.exe, so that the worm is run each time that you restart the computer.

Once it is running, W32.Dalbug.Worm inserts and executes these files:

%windir%\Smss.exe
%windir%\Csrss.exe

NOTE: %windir% is a variable. It is the folder where Windows is installed. By default, this is C:\Winnt on Windows NT/2000 systems or C:\Windows on Windows XP systems.

It also inserts the file %windir%\System32\Lady.exe. This is a non-malicious joke program that is executed by Smss.exe and Csrss.exe once they are running.

NOTE: The files Smss.exe and Csrss.exe have the same file names as two system files that reside in the %windir%\System32 folder. If you delete these files manually, make sure that you delete the copies that are in the home folder and not the ones in the System32 folder.

During execution, the Smss.exe and Csrss.exe files keep the service running, and checking every three seconds to make sure that it is still running. If you attempt to change or disable the service, it will immediately reinstall it. After 5 minutes of execution time, they activate the Lady.exe program , which will display a few flies crawling across the screen.

During its execution W32.Dalbug.Worm will periodically (every 10 seconds) also add the following registry values:

Smss.exe %windir%\smss.exe
Csrss.exe %windir%\csrss.exe

to the registry key

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

In addition, it tries to kill the Regedit.exe process if it is activated.

Smss.exe and Csrss.exe also try to create the these registry values, however if they detect that Regedit.exe is running, they will delete them (instead of creating them).

Finally, Smss.exe and Csrss.exe will also copy the worm to the following files:

%windir%\inf\Cdrom.sys
%windir%\Fonts\Dosoem.fon
%windir%\Help\Dosapp.hlp

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.

If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.

Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.

Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.

Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.

Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.

Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.


NOTE: These instructions are for all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

Due to the low timer intervals, it is extremely difficult to shut down this worm. However, you must end the processes that are started by the worm before you can remove it. Once the processes have been disabled, update the virus definitions, run a full system scan, and delete all files that are detected as W32.Dalbug.Worm. For details on how to do this, read the following instructions.

To scan for and delete the infected files:

1. End the processes that were started by the worm.
2. Obtain the most recent virus definitions. There are two ways to do this:
Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions have undergone full quality assurance testing by Symantec Security Response. They are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.

Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.

3. Start your Symantec antivirus software and make sure that it is configured to scan all files.
Norton AntiVirus Consumer products: Read the document How to configure Norton AntiVirus to scan all files.
Symantec Enterprise antivirus products: Read the document How to verify a Symantec Corporate antivirus product is set to scan All Files.
4. Run a full system scan.
5. If any files are detected as infected by W32.Dalbug.Worm, click Delete.




0

Sponsored Link
Ads by Google
Reply to Message Icon

Related Posts

See More







Post Locked

This post is quite old and has been locked from receiving new replies. Please create a new posting instead.


Go to Windows XP Forum Home


Sponsored links

Ads by Google


Results for: csrss.-smss.exe worm

2 smss.exe www.computing.net/answers/windows-xp/2-smssexe/92437.html

Smss.exe take high cpu when offline www.computing.net/answers/windows-xp/smssexe-take-high-cpu-when-offline/88677.html

SMSS.exe What is this? www.computing.net/answers/windows-xp/smssexe-what-is-this/51746.html