WORM_NGRBOT.VFF

This worm arrives via removable drives. 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 deletes the initially executed copy of itself.

Arrival Details

This worm arrives via removable drives.

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:

• %Application Data%\{random file name}
• %Application Data%\Update\Explorer.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
Windows Explorer Manager = "%Application Data%\Update\Explorer.exe"

Propagation

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

• {Removable Drive Letter}:\{random filename}.exe

It sets the attributes of the following items to Hidden to trick the user into clicking the .LNK files:

• {Removable Drive Letter}:\{Folder Name}

Other Details

This worm connects to the following possibly malicious URL:

• http://api.{BLOCKED}ia.com/

It deletes the initially executed copy of itself

NOTES:

It drops the following LNK files disguised as folders to trick the user into clicking them to execute the dropped copy of the worm:

• {Drive Letter}:\{Folder Name}.lnk