WORM_AUTORUN.HJB
Windows 98, ME, NT, 2000, XP, Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm drops copies of itself into all the removable drives connected to an affected system. 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
Installation
This worm drops the following copies of itself into the affected system:
- {Random malware path}\{Random file name}.exe
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
Microwsoft\addIngs
Proc = {File name}.exe
Loca = {Random malware path}
FRun = True
Host = {blank}
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\
CurrentVersion\Winlogon
Userinit = %System%\userinit.exe,{Random malware path}\{Random file name}.exe
(Note: The default value data of the said registry entry is %System%\userinit.exe,.)
Propagation
This worm drops copies of itself into all the removable drives connected to an affected system.
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=sYSTem.EXE
;
iCoN=%WIndir%\SYSteM32\sHEll32.dLl,4
;
aCTiOn=Open folder to view files Using explorer
;
shEll\oPeN\coMmaNd=SYSTEM.EXE
sHeLL\exPLOre\COMmAnd=SYSTEM.EXE
useaUTOpLaY=1
SOLUTION
Step 1
Identify and delete files detected as WORM_AUTORUN.HJB using the Recovery Console
Step 2
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\VB and VBA Program Settings\Microwsoft\addIngs
- Proc = {File name}.exe
Loca = {Random malware path}
FRun = True
Host = {blank}
- Proc = {File name}.exe
Step 3
Restore this modified 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\Winlogon
- From: Userinit = %System%\userinit.exe,{Random malware path}\{Random file name}.exe
To: Userinit = %System%\userinit.exe,
- From: Userinit = %System%\userinit.exe,{Random malware path}\{Random file name}.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as WORM_AUTORUN.HJB. 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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