WORM_RIMECUD.XDJ

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 drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

It executes commands from a remote malicious user, effectively compromising the affected system.

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:

• %User Profile%\dbmvlh.exe

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

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• Sp&8+10

It injects itself into the following processes as part of its memory residency routine:

• svchost.exe

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 = "%User Profile%\dbmvlh.exe"

Propagation

This worm creates the following folders in all removable drives:

• laqaok

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

• {Removable Drive}:\laqaok\rubigi.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[autorun]
shell\open\command=laqaok\rubigi.exe
action=Open folder to view files using Windows Explorer
Shell\Open\Command=laqaok\rubigi.exe
shellexecute=laqaok\rubigi.exe
shell\explore\command=laqaok\rubigi.exe
icon=SHELL32.dll,4
open=laqaok\rubigi.exe
USEAUTOPLAY=1

Backdoor Routine

This worm executes the following commands from a remote malicious user:

• Download and execute arbitrary files
• USB Spreader
• Visit a URL / Display pop-up advertisements
• MSN spreader
• P2P Spreader
• DDOS (TCP/UDP Flooding)
• Retrieve Stored Browser Passwords
• Update / Remove self

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• {BLOCKED}t.{BLOCKED}s.su:39888
• {BLOCKED}t.{BLOCKED}e.kz:39888
• {BLOCKED}a.{BLOCKED}e.com:39888
• {BLOCKED}a.{BLOCKED}sk.net:39888
• {BLOCKED}a.{BLOCKED}est.com:39888

Information Theft

This worm gathers the following data:

• IP Address
• Network Setting
• Operation System
• Admin Rights
• Country
• Port Used
• Username / Hostname