WORM_IRCBOT.DFW

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

It deletes the initially executed copy of itself.

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%\svchost.exe

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

It injects threads into the following normal process(es):

• Explorer.exe

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
svchost.exe = ""%Application Data%\svchost.exe""

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
yfrsuifvtcgkcigkctyik = ""%Application Data%\svchost.exe""

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
svchost.exe = ""%Application Data%\svchost.exe""

Backdoor Routine

This worm opens the following port(s) where it listens for remote commands:

• TCP 6667

It connects to any of the following IRC server(s):

• {BLOCKED}c.{BLOCKED}s.com

It joins any of the following IRC channel(s):

• #|TrIxz|#

It executes the following commands from a remote malicious user:

• Terminate/Kill Bot
• Delete files
• Visit URLs
• Update itself
• Download files
• Perform UDP Flood
• Infect Removable drive with .LNK and Autorun.inf files

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

• {BLOCKED}ablecoolx.info

Other Details

This worm connects to the following URL(s) to get the affected system's IP address:

• http://api.wipmania.com/

It deletes the initially executed copy of itself