Content

W32/Autorun.worm.h

Type
Virus
SubType
Worm
Discovery Date
07/05/2007
Length
varies
Minimum DAT
5068 (07/05/2007)
Updated DAT
5919 (03/13/2010)
Minimum Engine
5.1.00
Description Added
07/05/2007
Description Modified
12/08/2009 12:22 PM (PT)
Risk Assessment
Corporate User
Low
Home User
Low

Tab Navigation

Characteristics

-Update December 3, 2009 -

File Information

    • MD5 - BD3840B8FE9CFE26AAB37220E670BDD5
    • SHA - 95CFAE39D6E38C4679D6011B7E3BB25E878C3694
    • File Size - 275,456 bytes

Aliases

    • AVG - Worm/VB.VYG
    • Norman - W32/VBWorm.ABWQ
    • Ikarus - Worm.Win32.VBKrypt
    • Kaspersky - Worm.Win32.VBKrypt.j

Upon execution the worm copies itself into the following location

    • %SystemDrive%\Diskrun.exe

Also, drops the following files
    • %WINDIR%\system32\lowsec\local.ds
    • %WINDIR%\system32\lowsec\user.ds
    • %WINDIR%\system32\lowsec\user.ds.lll
    • %WINDIR%\System32\sdra64.exe
    • %SystemDrive%\Autorun.inf

The following registry keys have been added to the system.
    • HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\{35106240-D2F0-DB35-716E-127EB80A0299}
    • HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}

The worm disables the windows firewall by adding the following registry value
    • [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\]
      "EnableFirewall:" = "0x00000000"

The following registry values have been modified.

    • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\]
      "Userinit:" = "C:\WINDOWS\system32\userinit.exe,"
    • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\]
      "Userinit:" = "C:\WINDOWS\system32\userinit.exe,C:\WINDOWS\system32\sdra64.exe,"

The following folder has been added to the system
    • %WINDIR%\system32\lowsec

Once the user system is compromised it steals the financial information (e.g : User Name, Password etc) and sends that information to the remote site without the user knowledge.

[Where %WinDir% is the winows directory, for example c:\Windows, %SystemDrive% is the drive where the Operating System is installed, in most cases it will be C:\]

                                        -------------------------------------

File Information

MD5 - A3E855DE7D37FB42BD804660AF8176F3
Size -36864 bytes

This worm copies itself to the %system% folder as explorer.exe (Size -36864 bytes) on drive C and connected external drives, and also creates an autorun.inf file on the external drives.

It adds the following registry entries.

  HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run       "EXPLORER.EXE"
  Type: REG_SZ
  Data: EXPLORER.EXE
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "wsctf.exe"
  Type: REG_SZ
  Data: wsctf.exe

It changes following registry entries.
  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon           "Userinit"
  Old type: REG_SZ
  New type: REG_SZ
  Old data: C:\WINDOWS\system32\userinit.exe,
  New data: userinit.exe,EXPLORER.EXE
         
It drops the following files:

         c:\WINDOWS\system32\explorer.exe (Size -36864 bytes)
  
         %External Drive%\autorun.inf (Size:165 bytes)

[Where %External Drive% is the drive letter of the External Storage Devices (e.g. USB stick, Flash drive, Pen Drive etc..)]

 

---------------------------------------------

-----Update november 11, 2009--------

File Information

    • MD5 - Bc2f7c071c53fe8ec6441e8f745af802
    • Size - 740352 bytes

This worm copies itself to a hidden folder called \RESTORE\k-1-3542-4232123213-7676767-8888886\ on drive C and connected external drives, and also creates an autorun.inf file on the external drives.

It adds the following registry entries.
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{67KLN5J0-4OPM-00WE-AAX5-77EF1D187563} "StubPath"
    • Type: REG_SZ
    • Data: C:\RESTORE\k-1-3542-4232123213-7676767-8888886\RanDll.exe

It drops the following files:

    • C:\RESTORE\k-1-3542-4232123213-7676767-8888886\Desktop.ini (Size: 62 bytes)
    • C:\RESTORE\k-1-3542-4232123213-7676767-8888886\RanDll.exe (Size: 740,352 bytes)
    • %External Drive%\autorun.inf (Size:254 bytes)

[Where %External Drive% is the drive letter of the External Storage Devices (e.g. USB stick, Flash drive, Pen Drive etc..)]

                               ------------------------------------------------

This detection is for a worm.It attempts to spread to removable drives by creating an autorun.inf file, which will run the worm automatically, if a systems which use the removable drive are set to Autorun.

The following registry keys are created:

    • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
      "comstr"="\"C:\\WINDOWS\\system32\\comstr.exe\""

The following files are written to root of writeable volumes:

    •  AUTORUN.INF
    •  BOOT.VBS
    •  HP.EXE
    •  SYSTEMM7.EXE

The following files are also written to the infected system:

    • %WINDIR%\SYSTEMM7.EXE
    • %WINDIR%\SYSTEM32\COMSTR.EXE
    • %WINDIR%\SYSTEM32\SYSTEMM7.EXE

Symptoms

    • Presence of above mentioned Files and registry keys
    • The worm is active in the process list

Method of Infection

This worm may be spread by its intented method of infected removable drives. Alternatively this may be installed by visiting a malicious web page (either by clicking on a link, or by the website hosting a scripted exploit which installs the worm onto the user's system with no user interaction.

Removal

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

Additional Windows ME/XP removal considerations

Variants

Variants

    N/A

All Information

Overview -

This detection is for a worm that attempts to copy itself to the root of any accessible disk volumes. Additionally it attempts to place an Autorun.inf file on the root of the volume so that it is executed the next time the volume is mounted.

Characteristics

Characteristics -

-Update December 3, 2009 -

File Information

    • MD5 - BD3840B8FE9CFE26AAB37220E670BDD5
    • SHA - 95CFAE39D6E38C4679D6011B7E3BB25E878C3694
    • File Size - 275,456 bytes

Aliases

    • AVG - Worm/VB.VYG
    • Norman - W32/VBWorm.ABWQ
    • Ikarus - Worm.Win32.VBKrypt
    • Kaspersky - Worm.Win32.VBKrypt.j

Upon execution the worm copies itself into the following location

    • %SystemDrive%\Diskrun.exe

Also, drops the following files
    • %WINDIR%\system32\lowsec\local.ds
    • %WINDIR%\system32\lowsec\user.ds
    • %WINDIR%\system32\lowsec\user.ds.lll
    • %WINDIR%\System32\sdra64.exe
    • %SystemDrive%\Autorun.inf

The following registry keys have been added to the system.
    • HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\{35106240-D2F0-DB35-716E-127EB80A0299}
    • HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}

The worm disables the windows firewall by adding the following registry value
    • [HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\]
      "EnableFirewall:" = "0x00000000"

The following registry values have been modified.

    • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\]
      "Userinit:" = "C:\WINDOWS\system32\userinit.exe,"
    • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\]
      "Userinit:" = "C:\WINDOWS\system32\userinit.exe,C:\WINDOWS\system32\sdra64.exe,"

The following folder has been added to the system
    • %WINDIR%\system32\lowsec

Once the user system is compromised it steals the financial information (e.g : User Name, Password etc) and sends that information to the remote site without the user knowledge.

[Where %WinDir% is the winows directory, for example c:\Windows, %SystemDrive% is the drive where the Operating System is installed, in most cases it will be C:\]

                                        -------------------------------------

File Information

MD5 - A3E855DE7D37FB42BD804660AF8176F3
Size -36864 bytes

This worm copies itself to the %system% folder as explorer.exe (Size -36864 bytes) on drive C and connected external drives, and also creates an autorun.inf file on the external drives.

It adds the following registry entries.

  HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run       "EXPLORER.EXE"
  Type: REG_SZ
  Data: EXPLORER.EXE
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "wsctf.exe"
  Type: REG_SZ
  Data: wsctf.exe

It changes following registry entries.
  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon           "Userinit"
  Old type: REG_SZ
  New type: REG_SZ
  Old data: C:\WINDOWS\system32\userinit.exe,
  New data: userinit.exe,EXPLORER.EXE
         
It drops the following files:

         c:\WINDOWS\system32\explorer.exe (Size -36864 bytes)
  
         %External Drive%\autorun.inf (Size:165 bytes)

[Where %External Drive% is the drive letter of the External Storage Devices (e.g. USB stick, Flash drive, Pen Drive etc..)]

 

---------------------------------------------

-----Update november 11, 2009--------

File Information

    • MD5 - Bc2f7c071c53fe8ec6441e8f745af802
    • Size - 740352 bytes

This worm copies itself to a hidden folder called \RESTORE\k-1-3542-4232123213-7676767-8888886\ on drive C and connected external drives, and also creates an autorun.inf file on the external drives.

It adds the following registry entries.
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{67KLN5J0-4OPM-00WE-AAX5-77EF1D187563} "StubPath"
    • Type: REG_SZ
    • Data: C:\RESTORE\k-1-3542-4232123213-7676767-8888886\RanDll.exe

It drops the following files:

    • C:\RESTORE\k-1-3542-4232123213-7676767-8888886\Desktop.ini (Size: 62 bytes)
    • C:\RESTORE\k-1-3542-4232123213-7676767-8888886\RanDll.exe (Size: 740,352 bytes)
    • %External Drive%\autorun.inf (Size:254 bytes)

[Where %External Drive% is the drive letter of the External Storage Devices (e.g. USB stick, Flash drive, Pen Drive etc..)]

                               ------------------------------------------------

This detection is for a worm.It attempts to spread to removable drives by creating an autorun.inf file, which will run the worm automatically, if a systems which use the removable drive are set to Autorun.

The following registry keys are created:

    • [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
      "comstr"="\"C:\\WINDOWS\\system32\\comstr.exe\""

The following files are written to root of writeable volumes:

    •  AUTORUN.INF
    •  BOOT.VBS
    •  HP.EXE
    •  SYSTEMM7.EXE

The following files are also written to the infected system:

    • %WINDIR%\SYSTEMM7.EXE
    • %WINDIR%\SYSTEM32\COMSTR.EXE
    • %WINDIR%\SYSTEM32\SYSTEMM7.EXE

Symptoms

Symptoms -

    • Presence of above mentioned Files and registry keys
    • The worm is active in the process list

Method of Infection

Method of Infection -

This worm may be spread by its intented method of infected removable drives. Alternatively this may be installed by visiting a malicious web page (either by clicking on a link, or by the website hosting a scripted exploit which installs the worm onto the user's system with no user interaction.

Removal -

Removal -

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

Additional Windows ME/XP removal considerations

Variants

Variants -

    N/A