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Trend Micro has received multiple infections similar to this threat from multiple, independent sources, including customer reports and internal sources. These indicate that this threat poses a high risk to users due to the increased possibility of infection.
To get a one-glance comprehensive view of the behavior of this Worm, refer to the Threat Diagram shown below.
This worm opens Microsoft Word in order to hide its malicious routines from the user. It creates registry entries to prevent execution of specific applications, as well as the various functions of the Windows Security Center. It also modifies registry entries to lower the security settings of the system, as well as delete other entries to disable Safe Mode.
For its backdoor routine, this worm is capable of joining a predetermined Internet Relay chat (IRC) channel where it can receive commands from a malicious user.
This worm adds registry entries to enable its automatic execution at every system startup.
It modifies certain registry entries to disable Security Center functions. Doing this allows this malware to execute its routines without being detected.
This worm modifies certain registry entries to disable Security Center functions. Doing this allows this malware to execute its routines without being detected.
This worm may be downloaded from the following remote sites:
This worm drops the following component file(s):
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It drops the following copies of itself into the affected system:
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\WinlogonShell = %Program Files%\Microsoft Office\OFFICE11\WINWORD.EXE
Other System Modifications
This worm adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security CenterAntiVirusDisableNotify = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center AntiVirusOverride = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center FirewallDisableNotify = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center FirewallOverride = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center FirstRunDisabled = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center UpdatesDisableNotify = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center UacDisableNotify = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc AntiVirusDisableNotify = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc AntiVirusOverride = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc FirewallDisableNotify = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc FirewallOverride = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc FirstRunDisabled = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc UpdatesDisableNotify = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc UacDisableNotify = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG EnableFileTracing = 1
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG EnableConsoleTracing = 0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG FileTracingMask = ffff0000
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG ConsoleTracingMask = ffff0000
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG MaxFileSize = 00100000
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG FileDirectory = %windir%\tracing
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system EnableLUA = 0
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinDefend Start = 4
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinDefendType = 4
It modifies the following registry entries to disable Security Center functions:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\SharedAccessType = 4
(Note: The default value data of the said registry entry is 20.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\SharedAccess Start = 4
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\wscsvcType = 4
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\wscsvcStart = 4
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\wuauservType = 4
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\wuauservStart = 4
It modifies the following registry entries to hide files with Hidden attributes:
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
It deletes the following registry keys:
This worm sends copies of itself to target recipients using the following instant-messaging (IM) applications:
This worm does the following:
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Identify and terminate files detected as WORM_LAMIN.AC
To terminate the malware/grayware/spyware process:
Enable Registry Editor
To enable Registry Editor:
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.
To delete the registry value this malware created:
Delete this registry key
To delete the registry key this malware/grayware created:
Restore this modified registry value
To restore the registry value this malware/grayware modified:
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:
Scan your computer with your Trend Micro product to delete files detected as WORM_LAMIN.AC. 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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