WORM_ZEROLL.AY

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.

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:

• %Application Data%\HEX-5823-6393-6818\jusched.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Java Update Manager = “%Application Data%\HEX-5823-6393-6818\jusched.exe”

Other System Modifications

This worm adds the following registry entries:

HKEY_LOCAL_MACHINE\System\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Application Data%\HEX-5823-6393-6818\jusched.exe = “%Application Data%\HEX-5823-6393-6818\jusched.exe:*: Enabled:Jave Update Manager”

Propagation

This worm creates the following folders in all removable drives:

• {removable drive letter}:\8585485

It drops the following copy(ies) of itself in all removable drives:

• {removable drive letter}:\8585485\{folder name}.exe

Dropping Routine

This worm drops the following files:

• %System%\winrtsnr.txt

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This worm connects to the following possibly malicious URL:

• http://updates.{BLOCKED}ks.co.in