WORM_OTORUN.XSF

This worm arrives by connecting affected removable drives to a system. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It creates folders in all physical and removable drives. It drops copies of itself in all drives. These dropped copies use the names of the folders located on the said drives for their file names.

Arrival Details

This worm arrives by connecting affected removable drives to a system.

It 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 and executes them:

• %System%\SYSINF0.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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wnetwiss
ImagePath = "%System%\SYSINF0.exe"

Other System Modifications

This worm adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wnetwiss

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wnetwiss\Security

It adds the following registry entries:

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services
Type = "20"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wnetwiss
Type = "110"

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wnetwiss
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wnetwiss
DisplayName = "Windows netware work information system setup"

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wnetwiss
Description = "Provide security by Windows netware work system information "

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wnetwiss\Security
Security = "{hex values}"

It creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and filename} = "{malware path and filename}:*:Enabled:SYSINF0"

Propagation

This worm creates the following folders in all physical and removable drives:

• No Delete .exe

It drops copies of itself in all drives. These dropped copies use the names of the folders located on the said drives for their file names.