WORM_VB.IWL
Microsoft: Worm:Win32/Soglueda.A; Kaspersky: Trojan-Spy.Win32.Agent.bhfq; Mcafee: Generic PWS.y!cth; Symantec: Trojan.ADH
Windows 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Propagates via removable drives
It creates a copy itself and replaces the legitimate Microsoft file SERVICES.EXE, which is responsible for interacting with system services. This file automatically executes at system startup. It replaces this legitimate file to enable its automatic execution at system startup.
This worm arrives by connecting affected removable drives to a system. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
518,022 bytes
PE
Yes
03 Aug 2010
Arrival Details
This worm arrives by connecting affected removable drives to a system.
It may be dropped by other malware.
It may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This worm drops and executes the following files:
- %System%\winm.dll - detected as TSPY_KEYLOGGER.AB
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It drops the following copies of itself into the affected system:
- %System%\ .cmd
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
Other System Modifications
This worm also creates the following registry entry(ies) as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.exe
@ = exefile
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
exefile
@ = aplicación
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
exefile\DefaultIcon
@ = shell32.dll,2
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- rundll.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=.\rundll c
shellexecute=.\rundll c
action=Explorar
icon=%SystemRoot%\system32\SHELL32.dll,8
shell=usbmenu
shell\usbmenu\command=.\rundll .\c
shell\usbmenu\icon=%SystemRoot%\system32\SHELL32.dll,8
shell\usbmenu=Explorar
Dropping Routine
This worm executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
Other Details
This worm does the following:
- It creates a copy itself as %System%\services.exe.
- It replaces the legitimate Microsoft file SERVICES.EXE, which is responsible for interacting with system services. This file automatically executes at system startup. It replaces this legitimate file to enable its automatic execution at system startup.
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
SOLUTION
8.900
7.361.00
03 Aug 2010
8/3/2010 12:00:00 AM
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Remove malware files dropped/downloaded by WORM_VB.IWL
- TSPY_KEYLOGGER.AB
Step 3
Restore a modified system file back to its folder location
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_LOCAL_MACHINE\SYSTEM\SOFTWARE\Classes\.exe
- @ = exefile
- @ = exefile
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\exefile
- @ = aplicación
- @ = aplicación
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\exefile\DefaultIcon
- @ = shell32.dll,2
Step 5
Search and delete AUTORUN.INF files created by WORM_VB.IWL that contain these strings
open=.\rundll c
shellexecute=.\rundll c
action=Explorar
icon=%SystemRoot%\system32\SHELL32.dll,8
shell=usbmenu
shell\usbmenu\command=.\rundll .\c
shell\usbmenu\icon=%SystemRoot%\system32\SHELL32.dll,8
shell\usbmenu=Explorar
Step 6
Scan your computer with your Trend Micro product to delete files detected as WORM_VB.IWL. 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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