WORM_AUTORUN.BPD
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This worm drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
43,008 bytes
EXE
Yes
21 Aug 2008
Installation
This worm drops the following copies of itself into the affected system:
- %User Temp%\sob5467.exe
(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.)
It drops the following files:
- %User Temp%\ntdbg.dat
- %System Root%\RECYCLER\Z-1-6-22-1085480564-571221492-571812059-1003\desktop.ini
- %System Root%\RECYCLER\Z-1-6-22-1085480564-571221492-571812059-1003\rec
- %System Root%\RECYCLER\Z-1-6-22-1085480564-571221492-571812059-1003\send
- %System Root%\RECYCLER\Z-1-6-22-1085480564-571221492-571812059-1003\send\sysinf
- %System Root%\RECYCLER\Z-1-6-22-1085480564-571221492-571812059-1003\u.dat
(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It creates the following folders:
- %System Root%\RECYCLER\Z-1-6-22-1085480564-571221492-571812059-1003
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
SCMTool = "{malware path}\{malware name}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
@ = "%User Temp%\sob5467.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SCMTool = "{malware path}\{malware name}"
Other System Modifications
This worm adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\IExplorer
SCMTool = "{malware path}\{malware name}"
It modifies the following registry key(s)/entry(ies) as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDriveTypeAutoRun = "ff"
(Note: The default value data of the said registry entry is 91.)
It adds the following registry keys as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\IExplorer
HKEY_LOCAL_MACHINE\SOFTWARE\IExplorer\
OptionalComponents
It modifies the following registry entries to hide files with Hidden attributes:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "2"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
(Note: The default value data of the said registry entry is 1.)
Propagation
This worm creates the following folders in all removable drives:
- Recycled
It drops the following copy(ies) of itself in all removable drives:
- explore.exe
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
[autorun]
ShellExecute=explore.exe
Item=255
SubItem=0
SID=111D30662781