WORM_PUSHBOT.BY

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.

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:

• %User Profile%\Application Data\E-73473-3674-74335\msnlgrsm.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It creates the following folders:

• %User Profile%\Application Data\E-73473-3674-74335

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It terminates the execution of the copy it initially executed and executes the copy it drops instead.

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
Essentials Messengers = "%User Profile%\Application Data\E-73473-3674-74335\msnlgrsm.exe"

Other System Modifications

This worm adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Application Data\E-73473-3674-74335\msnlgrsm.exe\E-73473-3674-74335\msnlgrsm.exe = "%User Profile%\Application Data\E-73473-3674-74335\msnlgrsm.exe\E-73473-3674-74335\msnlgrsm.exe"

Propagation

This worm creates the following folders in all removable drives:

• 8585485

Other Details

This worm connects to the following possibly malicious URL:

• {BLOCKED}elindo.com

NOTES:

It searches for folders in all removable drives then drops copies of itself as 8585485\{folder name}.exe.

It drops shortcut files pointing to the copy of itself in removable drives. These dropped LNK files use the names of the folders plus "s" located on the said drives for their file names (e.g. New Folders.lnk).

It then sets the attributes of the original folders to Hidden to trick the user into clicking the LNK files.