WORM_DIPLE.CCL

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.

It does not have any downloading capability.

It does not have any information-stealing capability.

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%\Microsoft-Driver-1-82-3875-8725-4265\winsvn.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 drops the following non-malicious file:

• %User Profile%\Application Data\msnsvconfig.txt

(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%\Microsoft-Driver-1-82-3875-8725-4265

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

• 8v6szc7cj7du86f

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
MicrosoftServiceUpdates = "%User Profile%\Microsoft-Driver-1-82-3875-8725-4265\winsvn.exe\winsvn.exe"

Other System Modifications

This worm adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Microsoft-Driver-1-82-3875-8725-4265\winsvn.exe\winsvn.exe = "%User Profile%\Microsoft-Driver-1-82-3875-8725-4265\winsvn.exe\winsvn.exe:*:Enabled:MicrosoftServiceUpdates"

Propagation

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

• winrsrvdr32.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]
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shellexecute=winrsrvdr32.exe
UseAutoPlay=1

Backdoor Routine

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

• {BLOCKED}500.net
• {BLOCKED}00.com

It executes the following commands from a remote malicious user:

• Download and execute files
• Perform SYN flood
• Remove itself
• Spread itself via ICQ

Download Routine

This worm does not have any downloading capability.

Information Theft

This worm does not have any information-stealing capability.

NOTES:

It creates the following folder in removable drives:

• {Removable Drive}:\951360278

It then searches for folders in removable drives then drop copies of itself as {folder name}.exe inside {Removable Drive}:\951360278. It then sets the attribute of the original folder to Read-Only, Hidden and System. It then creates an .LNK file as {folder name}.lnk that points to the malware copy to trick users into thinking that they are opening the legitimate folder.

It terminates itself if any of the following conditions are satisfied:

• If it is running under virtual machine. It checks if disk peripheral contains any of the following strings:
  • qemu
  • virtual
  • vmware
• If any of the following files exists on the affected system:
  • SbieDll.dll
  • SbieDllX.dll

It does not exploit any vulnerability.