WORM_AUTORUN.ZZR
Windows 2000, XP, Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Propagates via email, Propagates via removable drives
This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives by connecting affected removable drives to a system. It arrives via removable drives.
It drops copies of itself into all the removable drives connected to an affected system. 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 the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
403,968 bytes
PE
Yes
05 Oct 2010
Drops files
Arrival Details
This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It arrives by connecting affected removable drives to a system.
It arrives via removable drives.
Installation
This worm drops the following copies of itself into the affected system:
- %System%\NvTaskbarInit.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It drops the following component file(s):
- %System%\NvMcTray.exe - detected as TROJ_HILOTI.IB
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows 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
Nvidia Control Center = %System%\NvTaskbarInit.exe
Other System Modifications
This worm adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\Nvideo
@ =
HKEY_LOCAL_MACHINE\SOFTWARE\Nvideo
@ =
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = 0
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\\NvTaskbarInit.exe = %System%\NvTaskbarInit.exe:*:Enabled:Explorer
Propagation
This worm creates the following folders in all removable drives:
- RECYCLER:\S-1-6-21-2434476521-1645641927-702000330-1542
It drops copies of itself into all the removable drives connected to an affected system.
It drops the following copy(ies) of itself in all removable drives:
- RECYCLER:\S-1-6-21-2434476521-1645641927-702000330-1542\redmond.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=RECYCLER:\S-1-6-21-2434476521-1645641927-702000330-1542\redmond.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open=Open
shell\open\command=RECYCLER:\S-1-6-21-2434476521-1645641927-702000330-1542\redmond.exe
shell\open\default=1
Dropping Routine
This worm executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
SOLUTION
8.900
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
Remove malware files dropped/downloaded by WORM_AUTORUN.ZZR
- TROJ_HILOTI.IB
Step 3
Restart in Safe Mode
Step 4
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
- Nvidia Control Center=%System%\NvTaskbarInit.exe
- Nvidia Control Center=%System%\NvTaskbarInit.exe
- In HKEY_CURRENT_USER\Software\
- Nvideo
- Nvideo
- In HKEY_LOCAL_MACHINE\SOFTWARE\
- Nvideo
- Nvideo
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- EnableLUA=0
- EnableLUA=0
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %System%\NvTaskbarInit.exe =%System%\NvTaskbarInit.exe:*:Enabled:Explorer
- %System%\NvTaskbarInit.exe =%System%\NvTaskbarInit.exe:*:Enabled:Explorer
Step 5
Search and delete AUTORUN.INF files created by WORM_AUTORUN.ZZR that contain these strings
Step 6
Scan your computer with your Trend Micro product to delete files detected as WORM_AUTORUN.ZZR. 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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