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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 drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
It also has rootkit capabilities, which enables it to hide its processes and files from the user.
This worm drops the following copies of itself into the affected system:
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunWSVCHO = "%Windows%\system\svhost.exe"
It registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sysdrv32Type = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sysdrv32Start = "3"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sysdrv32 ErrorControl = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sysdrv32 ImagePath = "\??\%System%\drivers\sysdrv32.sys"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sysdrv32DisplayName = "Play Port I/O Driver"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sysdrv32Group = "SST wanport drivers"
Other System Modifications
This worm adds the following registry keys:
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List%System%\svhost.exe = "%System%\svhost.exe:*:Microsoft Enabled"
This worm drops the following copy(ies) of itself in all removable drives:
This worm connects to the following URL(s) to send and receive commands from a remote malicious user:
This worm also has rootkit capabilities, which enables it to hide its processes and files from the user.
This worm drops the following files:
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Restart in Safe Mode
To restart in Safe Mode:
• For Windows 2000 users
• For Windows XP users
• For Windows Server 2003 users
• For Windows Vista and Windows 7 users
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.
To delete the registry key this malware/grayware created:
Delete this registry value
To delete the registry value this malware/grayware created:
Search and delete this file
To manually delete a malware/grayware file from an affected system:
• For Windows 2000, Windows XP, and Windows Server 2003:
• For Windows Vista and Windows 7 users:
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_NEERIS.A. 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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