TROJ_FLYSTUD.SMA
Worm:Win32/Nuj.A (Microsoft); Generic.dx (McAfee); Suspicious.AD (Symantec); ARC:Embedded (Kaspersky); Trojan.Win32.Autorun.dm (v) (Sunbelt); Trojan-Downloader:W32/VB.BUE (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
1,010,344 bytes
EXE
No
09 Nov 2011
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan creates the following folders:
- %User Temp%\E_4
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Other System Modifications
This Trojan 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.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\E_4\krnln.fnr
- %User Temp%\E_4\HtmlView.fne
- %User Temp%\E_4\iext.fnr
- %User Temp%\E_4\eAPI.fne
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
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
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"
Step 3
Search and delete this folder
Step 4
Search and delete these components
- %User Temp%\E_4\krnln.fnr
- %User Temp%\E_4\HtmlView.fne
- %User Temp%\E_4\iext.fnr
- %User Temp%\E_4\eAPI.fne
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_FLYSTUD.SMA. 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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