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 removal tool for win32.Randex.d

 http://securityresponse.symantec.com/avcenter/venc/data/w32.randex.d.html

W32.Randex.D  
Discovered on: June 27, 2003  
Last Updated on: August 08, 2003 04:24:50 PM

 
 

   
 

W32.Randex.D is a network-aware worm that will copy itself to the following paths on computers with weak administrator passwords:

\Admin$\system32\msmsgri32.exe
\c$\winnt\system32\msmsgri32.exe


The worm will also drop a Backdoor Trojan detected as Backdoor.Roxy, which will listen on the following TCP ports:
3330
3331
3332
3361


NOTE:
The virus definitions dated prior to July 31, 2003 detect the dropped file as Backdoor.Trojan.
The detection for W32.Randex.D was updated in virus definitions dated August 6, 2003 to account for the discovery of a minor variant. This file exhibited the same characteristics as previous samples.


Also Known As:  W32/Slanper.worm [McAfee], W32/Slanper-A [Sophos], Worm.Win32.Randex.d [KAV]
 
Type:  Worm
Infection Length:  32,256 bytes, 13,824 bytes
 
 
 
Systems Affected:  Windows NT, Windows 2000, Windows XP
Systems Not Affected:  Macintosh, OS/2, UNIX, Linux
 
 
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http://securityresponse.symantec.com/avcenter/venc/data/w32.randex.d.html#removalinstructions

W32.Randex.D  
Discovered on: June 27, 2003  
Last Updated on: August 08, 2003 04:24:50 PM

 
 

   
 

W32.Randex.D is a network-aware worm that will copy itself to the following paths on computers with weak administrator passwords:

\Admin$\system32\msmsgri32.exe
\c$\winnt\system32\msmsgri32.exe


The worm will also drop a Backdoor Trojan detected as Backdoor.Roxy, which will listen on the following TCP ports:
3330
3331
3332
3361


NOTE:
The virus definitions dated prior to July 31, 2003 detect the dropped file as Backdoor.Trojan.
The detection for W32.Randex.D was updated in virus definitions dated August 6, 2003 to account for the discovery of a minor variant. This file exhibited the same characteristics as previous samples.


Also Known As:  W32/Slanper.worm [McAfee], W32/Slanper-A [Sophos], Worm.Win32.Randex.d [KAV]
 
Type:  Worm
Infection Length:  32,256 bytes, 13,824 bytes
 
 
 
Systems Affected:  Windows NT, Windows 2000, Windows XP
Systems Not Affected:  Macintosh, OS/2, UNIX, Linux
 
 
 


 
Virus Definitions (Intelligent Updater) *
 June 28, 2003
 
 
Virus Definitions (LiveUpdate™) **
 June 28, 2003
 
 
*
 Intelligent Updater definitions are released daily, but require manual download and installation.
Click here to download manually.
 
**
 LiveUpdate virus definitions are usually released every Wednesday.
Click here for instructions on using LiveUpdate.
 
 
 




Wild:

Number of infections: 50 - 999
Number of sites: More than 10
Geographical distribution: Low
Threat containment: Easy
Removal: Moderate
 Threat Metrics
 
         
Wild:
Low
 Damage:
Medium
 Distribution:
Medium
 
 

Damage

Payload:
Compromises security settings: Allows unauthorized remote access.
Distribution

Ports: TCP 3330, 3331, 3332, 3361
Shared drives: Attempts to copy itself to administrative shares with weak passwords.


When W32.Randex.D is executed, it does the following:


Attempts to authenticate itself to randomly generated IP addresses. The user account list for that remote machine is enumerated, using the NetUserEnum() API. It will try connecting as everyone in the list of users that exist on the remote machine, until it connects successfully or runs out of accounts. It attempts this using one of the following passwords:
<blank>
admin
root
1
111
123
1234
123456
654321
!@#$
asdf
asdfgh
!@#$%
!@#$%^
!@#$%^&
!@#$%^&*
server

This may result in accounts being locked out due to unsuccessful login attempts.


Copies itself to computers, with weak administrator passwords, as the following:
\\<authenticated IP>\Admin$\system32\msmsgri32.exe
\\<authenticated IP>\c$\winnt\system32\msmsgri32.exe


Schedules a network job to run the worm.


Adds the value:

"mssyslanhelper"="msmsgri32.exe"

or

"mslanhelper"="msmsgri32.exe"

to the registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

so that the worm runs when you start Windows.


Creates and runs Backdoor.Roxy as Payload.dat. The Backdoor Trojan adds the value:

"System Initialization"="payload.dat"

to the registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

so that the Backdoor.Trojan runs when you start Windows.


The Backdoor.Trojan sends a notification to a hard-coded IP address, indicating that it is running.


The Backdoor.Trojan listens on the following TCP ports for remote instructions:
port 3330
port 3331
port 3332






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.



The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.


Disable System Restore (Windows Me/XP).
Update the virus definitions.
Run a full system scan and delete all the files detected as W32.Randex.D.
Delete the value that was added to the registry.

For specific details on each of these steps, read the following instructions.

1. Disabling System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
"How to disable or enable Windows Me System Restore"
"How to turn off or turn on Windows XP System Restore"