PE_DELZIUM.A
Virus:Win32/Delicium.A (Microsoft); W32/Autorun.worm.fj (McAfee); W32.Delezium!inf (Symantec); Worm.Win32.AutoRun.erd (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan.Generic.680659 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: File infector
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This file infector 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.
TECHNICAL DETAILS
86,016 bytes
EXE
Yes
08 Nov 2011
Arrival Details
This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This file infector adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
.Net Recovery = "rundll32.exe dotnetfx.dll,repair"
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "userinit.exe,New Folder.exe"
(Note: The default value data of the said registry entry is %System%\userinit.exe,.)
Other System Modifications
This file infector adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DotNetRecovery
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\advapi32.dll[MofResourceName] = "LowDateTime:-878345984,HighDateTime:29653303***Binary mof compiled successfully"
(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "LowDateTime:-1893836544,HighDateTime:29653288***Binary mof compiled successfully"
(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\mssmbios.sys[MofResource] = "LowDateTime:246686720,HighDateTime:29653305***Binary mof compiled successfully"
(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "LowDateTime:1716098048,HighDateTime:29653287***Binary mof compiled successfully"
(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ipnat.sys[IPNATMofResource] = "LowDateTime:741130752,HighDateTime:29653288***Binary mof compiled successfully"
(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\Drivers\HTTP.sys[UlMofResource] = "LowDateTime:-2038869248,HighDateTime:29653287***Binary mof compiled successfully"
(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = "1"
Dropping Routine
This file infector drops the following files:
- dotnetfx.dll
This report is generated via an automated analysis system.
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
Identify and delete files detected as PE_DELZIUM.A using either the Startup Disk or Recovery Console
Step 3
Enable Registry Editor, Task Manager, and Folder options
Step 4
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- System
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
- DotNetRecovery
Step 5
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\CurrentVersion\Run
- .Net Recovery = "rundll32.exe dotnetfx.dll,repair"
Step 6
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_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- From: %System%\advapi32.dll[MofResourceName] = "LowDateTime:-878345984,HighDateTime:29653303***Binary mof compiled successfully"
To: %System%\advapi32.dll[MofResourceName] = "LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully"
- From: %System%\advapi32.dll[MofResourceName] = "LowDateTime:-878345984,HighDateTime:29653303***Binary mof compiled successfully"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- From: %System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "LowDateTime:-1893836544,HighDateTime:29653288***Binary mof compiled successfully"
To: %System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully"
- From: %System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "LowDateTime:-1893836544,HighDateTime:29653288***Binary mof compiled successfully"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- From: %System%\DRIVERS\mssmbios.sys[MofResource] = "LowDateTime:246686720,HighDateTime:29653305***Binary mof compiled successfully"
To: %System%\DRIVERS\mssmbios.sys[MofResource] = "LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully"
- From: %System%\DRIVERS\mssmbios.sys[MofResource] = "LowDateTime:246686720,HighDateTime:29653305***Binary mof compiled successfully"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- From: %System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "LowDateTime:1716098048,HighDateTime:29653287***Binary mof compiled successfully"
To: %System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully"
- From: %System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "LowDateTime:1716098048,HighDateTime:29653287***Binary mof compiled successfully"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- From: %System%\DRIVERS\ipnat.sys[IPNATMofResource] = "LowDateTime:741130752,HighDateTime:29653288***Binary mof compiled successfully"
To: %System%\DRIVERS\ipnat.sys[IPNATMofResource] = "LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully"
- From: %System%\DRIVERS\ipnat.sys[IPNATMofResource] = "LowDateTime:741130752,HighDateTime:29653288***Binary mof compiled successfully"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- From: %System%\Drivers\HTTP.sys[UlMofResource] = "LowDateTime:-2038869248,HighDateTime:29653287***Binary mof compiled successfully"
To: %System%\Drivers\HTTP.sys[UlMofResource] = "LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully"
- From: %System%\Drivers\HTTP.sys[UlMofResource] = "LowDateTime:-2038869248,HighDateTime:29653287***Binary mof compiled successfully"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "userinit.exe,New Folder.exe"
To: Userinit = "%System%\userinit.exe,"
- From: Userinit = "userinit.exe,New Folder.exe"
Step 7
Search and delete this file
- dotnetfx.dll
Step 8
Scan your computer with your Trend Micro product to clean files detected as PE_DELZIUM.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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