Win32.HLLW.Autoruner1.13760

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Classes\scrfile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[<HKLM>\SOFTWARE\Classes\lnkfile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,<SYSTEM32>\IExplorer.exe'
[<HKLM>\SOFTWARE\Classes\exefile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[<HKLM>\SOFTWARE\Classes\comfile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'SecurityCenter' = '<LS_APPDATA>\WINDOWS\CSRSS.EXE'
[<HKLM>\SOFTWARE\Classes\piffile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[<HKLM>\SOFTWARE\Classes\batfile\shell\open\command] '' = '"<SYSTEM32>\shell.exe" "%1" %*'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Office Startup' = '<LS_APPDATA>\WINDOWS\Microsoft Office Startup.bat'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'MSMSGS' = '<LS_APPDATA>\WINDOWS\WINLOGON.EXE'
[<HKCU>\Control Panel\Desktop] 'SCRNSAVE.EXE' = '<SYSTEM32>\ash.SCR'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'ash' = '%WINDIR%\SVCHOST.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'System Monitoring' = '<LS_APPDATA>\WINDOWS\LSASS.EXE'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe "<SYSTEM32>\IExplorer.exe"'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Service%USERNAME%' = '<LS_APPDATA>\WINDOWS\SERVICES.EXE'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Logon%USERNAME%' = '<LS_APPDATA>\WINDOWS\CSRSS.EXE'

Creates or modifies the following files:

%ALLUSERSPROFILE%\Start Menu\Programs\Startup\Empty.pif

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\wscsvc] 'ImagePath' = '<LS_APPDATA>\WINDOWS\CSRSS.EXE'
[<HKLM>\SYSTEM\ControlSet002\Services\srservice] 'ImagePath' = '<LS_APPDATA>\WINDOWS\SMSS.EXE'
[<HKLM>\SYSTEM\ControlSet002\Services\wscsvc] 'ImagePath' = '<LS_APPDATA>\WINDOWS\CSRSS.EXE'
[<HKLM>\SYSTEM\ControlSet001\Services\srservice] 'ImagePath' = '<LS_APPDATA>\WINDOWS\SMSS.EXE'

Creates the following files on removable media:

<Drive name for removable media>:\msvbvm60.dll
<Drive name for removable media>:\ash\msvbvm60.dll
<Drive name for removable media>:\ANSAV.exe
<Drive name for removable media>:\Data %USERNAME%.exe
<Drive name for removable media>:\ash\Winzip.exe
<Drive name for removable media>:\desktop.ini
<Drive name for removable media>:\ash\Folder.htt
<Drive name for removable media>:\autorun.inf
<Drive name for removable media>:\autoexec.bat

Malicious functions:

To complicate detection of its presence in the operating system,

forces the system hide from view:

hidden files
file extensions

blocks execution of the following system utilities:

Windows Task Manager (Taskmgr)
Registry Editor (RegEdit)

blocks the following features:

System Restore (SR)

Creates and executes the following:

<LS_APPDATA>\WINDOWS\SERVICES.EXE
<LS_APPDATA>\WINDOWS\LSASS.EXE
<LS_APPDATA>\WINDOWS\SMSS.EXE
<SYSTEM32>\IExplorer.exe
<LS_APPDATA>\WINDOWS\WINLOGON.EXE
<LS_APPDATA>\WINDOWS\CSRSS.EXE

Executes the following:

<SYSTEM32>\svchost.exe

Modifies settings of Windows Explorer:

[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoSetFolders' = '00000001'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFind' = '00000001'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoRun' = '00000001'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFolderOptions' = '00000001'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer] 'NoFolderOptions' = '00000001'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoRecentDocsMenu' = '00000001'

Modifies file system :

Creates the following files:

C:\desktop.ini
<LS_APPDATA>\WINDOWS\Microsoft Office Startup.bat
C:\ash\Folder.htt
C:\ash2.txt
%WINDIR%\msvbvm60.dll
C:\autorun.inf
C:\Data %USERNAME%.exe
C:\ANSAV.exe
C:\msvbvm60.dll
C:\ash\Winzip.exe
C:\ash\msvbvm60.dll
C:\ash1.txt
<SYSTEM32>\shell.exe
<SYSTEM32>\ash.scr
C:\SVCHOST.exe
%WINDIR%\SVCHOST.exe
<SYSTEM32>\IExplorer.exe
<LS_APPDATA>\WINDOWS\LSASS.EXE
<LS_APPDATA>\WINDOWS\SMSS.EXE
<LS_APPDATA>\WINDOWS\SERVICES.EXE
<LS_APPDATA>\WINDOWS\WINLOGON.EXE
<LS_APPDATA>\WINDOWS\CSRSS.EXE

Sets the 'hidden' attribute to the following files:

C:\ash\msvbvm60.dll
C:\msvbvm60.dll
C:\ash\Folder.htt
C:\desktop.ini
<Drive name for removable media>:\ash\Folder.htt
<Drive name for removable media>:\ash\msvbvm60.dll
<Drive name for removable media>:\msvbvm60.dll
<Drive name for removable media>:\desktop.ini
<Drive name for removable media>:\autoexec.bat
%WINDIR%\msvbvm60.dll
<LS_APPDATA>\WINDOWS\CSRSS.EXE
<LS_APPDATA>\WINDOWS\SERVICES.EXE
<LS_APPDATA>\WINDOWS\WINLOGON.EXE
<LS_APPDATA>\WINDOWS\LSASS.EXE
<LS_APPDATA>\WINDOWS\SMSS.EXE
C:\ash1.txt
C:\ash2.txt
%WINDIR%\SVCHOST.exe
C:\SVCHOST.exe

Deletes the following files:

%TEMP%\~DFF1BC.tmp
%TEMP%\~DF9B06.tmp
%TEMP%\~DF62DD.tmp
%TEMP%\~DF96FA.tmp
%TEMP%\~DFF9C0.tmp
%TEMP%\~DF6C5E.tmp
%TEMP%\~DF9EFC.tmp

Miscellaneous:

Searches for the following windows:

ClassName: 'ComboBoxEx32' WindowName: ''
ClassName: 'RebarWindow32' WindowName: ''
ClassName: 'CabinetWClass' WindowName: ''
ClassName: '#32770' WindowName: ''
ClassName: 'Edit' WindowName: ''
ClassName: 'ComboBox' WindowName: ''
ClassName: '' WindowName: 'Registry Editor'
ClassName: 'RegEdit_RegEdit' WindowName: ''
ClassName: 'Indicator' WindowName: ''
ClassName: 'ExploreWClass' WindowName: ''
ClassName: '' WindowName: 'Local Settings'
ClassName: '' WindowName: 'Folder Options'

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Technical Information