Threat Description

SQLSpida

Details

Aliases:SQLSpida, Worm.SQLSpida, SQLsnake, Digispid
Category:Malware
Type:Worm
Platform:W32

Summary



SQLSpida is a worm that spreads among machines running Microsoft SQL Server. The worm uses the default SQL Server system administrator account ("sa") with an empty password to infect the system.Note: Change the password on your SA account to a strong one and block access to your SQL server from the public internet.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You also may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details




Variant:SQLSpida.A

SQLSpida.A attempts to find machines running SQL Server with an empty "sa" account, by scanning port 1433 from random IP address ranges. It does not scan private Class A networks (10, 127, 172 and 192).If a vulnerable machine is found, the worm will change both "sqlagentcmdexec" and "sa" user passwords to same, random four character password. "sqlagentcmdexec" user is also added to both local Administrators and Domain Admins groups.The worm also collects information about the machine, such as a dump of password hashes from the system, and sends them via email, propably to the virus writer.It copies following files to Windows' System32 directory on the host that it infects:

  sqlexec.exe
 clemail.exe
 sqlprocess.js
 sqlinstall.bat
 sqldir.js
 run.js
 timer.dll
 samdump.dll
 pwdump2.exe

and the following file to Windows' System32\drivers directory:

  services.exe

Next the worm starts scanning random Class C networks. The worm will scan until it has infected ten machines and it removes itself from the host.


Variant:SQLSpida.B

SQLSpida.B is similar to .A variant.Instead of using "sqlagentcmdexec" account, this variant enables the "guest" account, sets its password and adds this account to both local Administrators and Domain Admins groups. After the system has been infected, the guest account is disabled and removed from administative groups in order to hide traces of the worm.The file "sqlexec.exe" has been replaced with a JavaScript file "sqlexec.js".This variant also sets the following registry key so, that it will be executed in the system restart:

  HKLM\System\CurrentControlSet\Services\NetDDE\ImagePath


Detection


F-Secure Anti-Virus detects SQLSpida worm with the updates published on May 22th, 2002:
Database: 2002-05-22_01



Technical Details: Katrin Tocheva, Gergely Erdelyi, Mikko Hypponen and Sami Rautiainen, F-Secure Corp.; May 22nd, 2002


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