WORM_VBOBFUS.AQ
Worm:Win32/Vobfus.JN(Microsoft)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It modifies registry entries to hide files with System and Read-only attributes.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
Arrival Details
This worm 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 worm drops the following copies of itself into the affected system:
- %UserProfile%\{random}.exe
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
{random} = "%User Profile%\{random}.exe /h"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Run = "%User Profile%\{random}.exe /k"
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%User Profile%\{random}.exe /y"
Other System Modifications
This worm modifies the following registry entries to hide files with System and Read-only attributes:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSupperHidden = "00000001"
(Note: The default value data of the said registry entry is 00000000.)
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- {Drive Letter}\Porn.exe
- {Drive Letter}\Secret.exe
- {Drive Letter}\Sexy.exe
- {Drive Letter}\{random}.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]
open={random}.exe
acTiOn=4564
uSEAuTOpLaY=1
Other Details
This worm connects to the following possibly malicious URL:
- {BLOCKED}1.{BLOCKED}dates.com