WORM_UTOTI.BQ
Symantec: W32.Changeup!gen9 ; Mcafee: Downloader-CJX.gen.o; Kaspersky: Trojan.Win32.VBKrypt.bfqf
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Propagates via removable drives
It drops .LNK files in all removable drives which are shortcut files to the dropped copy.
This worm arrives via removable drives. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites. However, as of this writing, the said sites are inaccessible.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
It connects to a website to send and receive information.
TECHNICAL DETAILS
Varies
PE
Yes
09 Feb 2011
Compromises system security
Arrival Details
This worm arrives via removable drives.
It may be dropped by other malware.
It may be unknowingly downloaded by a user while visiting malicious websites.
However, as of this writing, the said sites are inaccessible.
Installation
This worm drops the following copies of itself into the affected system:
- %User Temp%\{random name}.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
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
{malware name}.exe = %User Temp%\{random name}.exe /w
Other System Modifications
This worm modifies the following registry entries to hide files with Hidden attributes:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 0
(Note: The default value data of the said registry entry is 1.)
Propagation
This worm 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]
action=View the files
open={malware name}.exe
icon=%systemroot%\system32\shell32.dll,4
userautoplay=1
Backdoor Routine
This worm connects to the following websites to send and receive information:
- ns1.{BLOCKED}ll.net
- ns1.{BLOCKED}r1253.com
- ns1.{BLOCKED}hares.org
Other Details
This worm does the following:
- Drops the following .LNK files in all removable drives which are shortcut files to the dropped copy:
- Documents.lnk
- Music.lnk
- New Folder.lnk
- Passwords.lnk
- Pictures.lnk
- Video.lnk
SOLUTION
8.900
7.827.00
09 Feb 2011
2/9/2011 12:00:00 AM
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Identify and terminate files detected as WORM_UTOTI.BQ
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 3
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {malware name} = %User Profile%\{random name}.exe
- {malware name} = %User Profile%\{random name}.exe
Step 4
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: ShowSuperHidden=0
To: ShowSuperHidden=1
- From: ShowSuperHidden=0
Step 5
Search and delete this file
Step 6
Search and delete AUTORUN.INF files created by WORM_UTOTI.BQ that contain these strings
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_UTOTI.BQ. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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