WORM_UTOTI.RC
Worm:Win32/Nuqel.AJ (Microsoft); [.au3]:W32/Autorun.worm.gen.za (McAfee); W32.SillyDC (Symantec); PAK:UPX, ARC:Embedded, [script.au3]:Worm.Win32.AutoIt.i (Kaspersky); Win32.Autorun.gen (v) (Sunbelt); Win32.Worm.Autoit.O (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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 disables Task Manager, Registry Editor, and Folder Options.
However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
215,456 bytes
EXE
Yes
23 May 2012
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:
- %System%\msmsgs.exe
- {Removable Drive}\system.exe
- {Removable Drive}\{random name}.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Autostart Technique
This Worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SYS1 = "%System%\system.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SYS2 = "%System%\bad1.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SYS3 = "%System%\bad2.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SYS4 = "%System%\bad3.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Msmsgs = "%System%\Msmsgs.exe"
Other System Modifications
This Worm adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
system
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
SuperHidden = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
HideFileExt = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "2"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDriveTypeAutoRun = "91"
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoFind = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoFolderOptions = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
system
DisableTaskMgr = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
system
DisableRegistryTools = "1"
Dropping Routine
This Worm drops the following files:
- %System%\system.exe
- %System%\bad1.exe
- %System%\bad2.exe
- %System%\bad3.exe
- {removable drive}\autorun.inf
- %Windows%\autorun.inf
- %System%\Msmsgs.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Other Details
This Worm connects to the following possibly malicious URL:
- http://ppt.{BLOCKED}h.gs/web-p/pt/file/bad1.exe
- http://ppt.{BLOCKED}h.gs/web-p/pt/file/bad2.exe
However, as of this writing, the said sites are inaccessible.
SOLUTION
9.200
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Delete this registry key
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- SYS1 = "%System%\system.exe"
- SYS1 = "%System%\system.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- SYS2 = "%System%\bad1.exe"
- SYS2 = "%System%\bad1.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- SYS3 = "%System%\bad2.exe"
- SYS3 = "%System%\bad2.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- SYS4 = "%System%\bad3.exe"
- SYS4 = "%System%\bad3.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Msmsgs = "%System%\Msmsgs.exe"
- Msmsgs = "%System%\Msmsgs.exe"
Step 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: SuperHidden = 0
To: SuperHidden = 1
- From: SuperHidden = 0
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: ShowSuperHidden = 0
To: ShowSuperHidden = 1
- From: ShowSuperHidden = 0
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: HideFileExt = 1
To: HideFileExt = 0
- From: HideFileExt = 1
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: Hidden = 2
To: Hidden = 0
- From: Hidden = 2
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- From: NoFind = 1
To: NoFind = 0
- From: NoFind = 1
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- From: NoFolderOptions = 1
To: NoFolderOptions = 0
- From: NoFolderOptions = 1
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- From: NoDriveTypeAutoRun = 91
To: NoDriveTypeAutoRun = {Default}
- From: NoDriveTypeAutoRun = 91
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\system
- From: DisableTaskMgr = 1
To: DisableTaskMgr = 0
- From: DisableTaskMgr = 1
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\system
- From: DisableRegistryTools = 1
To: DisableRegistryTools = 0
- From: DisableRegistryTools = 1
Step 5
Search and delete this file
- %System%\system.exe
- %System%\bad1.exe
- %System%\bad2.exe
- %System%\bad3.exe
- {removable drive}\autorun.inf
- %Windows%\autorun.inf
- %System%\Msmsgs.exe
- {Removable Drive}\system.exe
- {Removable Drive}\{random name}.exe
Step 6
Scan your computer with your Trend Micro product to delete files detected as WORM_UTOTI.RC. 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 the following Trend Micro Support pages for more information:
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