WORM_SERVSTART.A

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It uses a list of user names to gain access to password-protected shares.

It connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible. It deletes the initially executed copy of itself.

Arrival Details

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This worm drops the following copies of itself into the affected system:

• %System%\{random file name}.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It then creates the following non-malicious file(s):

• %Temp%\Server.dll

(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)

It drops the following copies of itself into the affected system:

• F:\Server.exe
• E:\Server.exe
• D:\Server.exe
• C:\Server.exe

Autostart Technique

This worm registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
Description = "Providesmid a domain server for NI security."

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
DisplayName = "Nationalyta Instruments Domain Service"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
ImagePath = "%System%\{random file name}.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
Type = "10"

Propagation

This worm searches the network for the following shared networks onto which it attempts to drop copies of itself:

• F$\Server.exe
• E$\Server.exe
• D$\Server.exe
• C$\Server.exe
• admin$\Server.exe

It uses the following list of user names to gain access to password-protected shares:

• woaini
• angel
• asdfgh
• 1314520
• 5201314
• caonima
• 88888
• bbbbbb
• 12345678
• memory
• abc123
• qwerty
• 123456
• password
• enter
• xpuser
• money
• guest
• admin
• administrator
• movie

Other Details

This worm connects to the following website to send and receive information:

• {BLOCKED}156.{BLOCKED}2.org:80

However, as of this writing, the said sites are inaccessible.

It deletes the initially executed copy of itself