WORM_RIMECUD.FU

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

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%\wfvy.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = "%Application Data%\wfvy.exe"

Propagation

This worm drops copies of itself in removable drives. These dropped copies use the names of the folders located on the said drives for their file names.

Dropping Routine

This worm drops the following files:

• {Removable Drive Letter}:\autorun.inf

Other Details

This worm connects to the following possibly malicious URL:

• http://tep.{BLOCKED}mod.com
• http://{BLOCKED}i.{BLOCKED}mod.com
• http://{BLOCKED}i.{BLOCKED}ol400.com