WORM_AUTORUN.NAD
Windows 2000, XP, Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives as attachment to mass-mailed email messages.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
44,032 bytes
PE
No
28 Jul 2010
Arrival Details
This worm arrives as attachment to mass-mailed email messages.
Installation
This worm drops the following copies of itself into the affected system:
- %WINDOWS%\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
Shell = Explorer.exe %WINDOWS%\svchost.exe
(Note: The default value data of the said registry entry is Explorer.exe.)
Other System Modifications
This worm also creates the following registry entry(ies) as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
{exe found}
Debugger = "svchost.exe"
(Note: The default value data of the said registry entry is .)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"
(Note: The default value data of the said registry entry is .)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableVirtualization = "0"
(Note: The default value data of the said registry entry is .)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
PromptOnSecureDesktop = "0"
(Note: The default value data of the said registry entry is .)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
EnableFirewall = "0"
(Note: The default value data of the said registry entry is .)
It modifies the following registry entries to hide files with Hidden attributes:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = 2
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
SuperHidden = 0
(Note: The default value data of the said registry entry is 1.)
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 the following copy of itself in all physical and removable drives:
- N95_Image13022010.scr
- open.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]
open=open.exe
icon=%windir%\system32\shell32.dll,8
action=Open Drive to view files
shell\open=Open
shell\open\command=open.exe
shell\open\default=1
Download Routine
This worm accesses the following websites to download files:
- http://{BLOCKED}s.lycos.co.uk/iqreporters/ff.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/gc.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/ie.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/im.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/m.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/op.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/pspv.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/rd.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/SendEmail.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/tryme.iq
- http://{BLOCKED}s.lycos.co.uk/iqreporters/w.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/ff.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/gc.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/ie.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/im.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/m.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/op.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/pspv.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/rd.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/SendEmail.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/tryme.iq
- http://{BLOCKED}s.multimania.co.uk/iqreporters/w.iq
SOLUTION
8.900
07.364.09
05 Aug 2010
8/5/2010 12:00:00 AM
Step 1
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\{exe found}
- Debugger = svchost.exe
- Debugger = svchost.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- EnableLUA = 0
- EnableLUA = 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- EnableVirtualization = 0
- EnableVirtualization = 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- PromptOnSecureDesktop = 0
- PromptOnSecureDesktop = 0
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- EnableFirewall = 0
- EnableFirewall = 0
Step 2
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Shell = Explorer.exe %Windows%svchost.exe
To: Explorer.exe
- From: Shell = Explorer.exe %Windows%svchost.exe
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: Hidden = 2
To: 1
- From: Hidden = 2
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: ShowSuperHidden = 0
To: 1
- From: ShowSuperHidden = 0
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: SuperHidden = 0
To: 1
- From: SuperHidden = 0
Step 3
Search and delete these files
Step 4
Scan your computer with your Trend Micro product to delete files detected as WORM_AUTORUN.NAD. 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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