WORM_VOBFUS.SMK9
Worm:Win32/Vobfus.ED (Microsoft); VBObfus.dr (McAfee); W32.Changeup (Symantec); Worm.Win32.VBNA.b (Kaspersky); Trojan.Win32.Vobfus.a (v) (Sunbelt); Gen:Variant.Chinky.7 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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.
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.
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
geozaog = "%User Profile%\geozaog.exe /p"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /g"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /U"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /e"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /b"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /z"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /F"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /f"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /E"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /P"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /s"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /K"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /X"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /J"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /A"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /t"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /N"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /T"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /M"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /y"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /W"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /d"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /i"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /B"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /m"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /S"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /I"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /q"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /n"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /l"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /Y"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
geozaog = "%User Profile%\geozaog.exe /r"
Other System Modifications
This worm adds the following registry keys:
HKEY_CURRENT_USER\Software\Classes\
clsid
HKEY_CURRENT_USER\clsid\{42aedc87-2188-41fd-b9a3-0c966feabec1}
HKEY_CURRENT_USER\clsid\{42aedc87-2188-41fd-b9a3-0c966feabec1}\
InprocServer32
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\WindowsUpdate\
AU
NoAutoUpdate = "1"
HKEY_CURRENT_USER\clsid\{42aedc87-2188-41fd-b9a3-0c966feabec1}\
InprocServer32
ThreadingModel = "Both"
Dropping Routine
This worm drops the following files:
- @
- n
- L
Other Details
This worm connects to the following possibly malicious URL:
- http://3dgameupdate.{BLOCKED}e.com:60777/b.php
This report is generated via an automated analysis system.
SOLUTION
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
Restart in Safe Mode
Step 3
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Classes
- clsid
- In HKEY_CURRENT_USER\clsid
- {42aedc87-2188-41fd-b9a3-0c966feabec1}
- In HKEY_CURRENT_USER\clsid\{42aedc87-2188-41fd-b9a3-0c966feabec1}
- InprocServer32
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /p"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /g"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /U"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /e"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /b"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /z"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /F"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /f"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /E"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /P"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /s"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /K"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /X"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /J"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /A"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /t"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /N"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /T"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /M"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /y"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /W"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /d"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /i"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /B"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /m"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /S"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /I"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /q"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /n"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /l"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /Y"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- geozaog = "%User Profile%\geozaog.exe /r"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU
- NoAutoUpdate = "1"
- In HKEY_CURRENT_USER\clsid\{42aedc87-2188-41fd-b9a3-0c966feabec1}\InprocServer32
- ThreadingModel = "Both"
Step 5
Search and delete these components
- @
- n
- L
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_VOBFUS.SMK9. 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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