VBS_FAKEANTIV.SM
Worm:VBS/Slogod.L(Microsoft), VBS/Autorun.worm.k(McAfee), VBS/AutoRun.DX worm(Eset)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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 drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
32,844 bytes
VBS
Yes
01 Sep 2012
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:
- %System%\FAantivirus.vbs
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This worm 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,%System%\wscript.exe %System%\FAantivirus.vbs"
(Note: The default value data of the said registry entry is "%System%\userinit.exe,".)
Other System Modifications
This worm adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows
HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\System
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Window Title = "Fusion|Ace Enterprises"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
NoFolderOptions = "0"
HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\System
DisableCMD = "0"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.socio.fusionace.com"
(Note: The default value data of the said registry entry is "{Default start page}".)
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- {Drive Letter}:\FAantivirus.vbs
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=wscript.exe FAantivirus.vbs
icon=%System%\SHELL32.dll,8
action=Open folder to view files
shell\open=Open
shell\open\Command=wscript.exe FAantivirus.vbs
shell\Auto=AutoPlay
shell\Auto\Command=wscript.exe FAantivirus.vbs
shell\Explore\Command=wscript.exe FAantivirus.vbs
shell\Find=Search...
shell\Find\Command=wscript.exe FAantivirus.vbs
shell\Format...=Format...
shell\Format...\Command=wscript.exe FAantivirus.vbs
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
SOLUTION
9.300
9.109.00
15 May 2012
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
Identify and delete files detected as VBS_FAKEANTIV.SM using either the Startup Disk or Recovery Console
Step 3
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\Internet Explorer\Main
- Window Title = "Fusion|Ace Enterprises"
- Window Title = "Fusion|Ace Enterprises"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- DisableTaskMgr = "0"
- DisableTaskMgr = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- DisableRegistryTools = "0"
- DisableRegistryTools = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- NoFolderOptions = "0"
- NoFolderOptions = "0"
- In HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System
- DisableCMD = "0"
- DisableCMD = "0"
Step 4
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_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- From: Start Page = "http://www.socio.fusionace.com"
To: Start Page = "{Default start page}"
- From: Start Page = "http://www.socio.fusionace.com"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,%System%\wscript.exe %System%\FAantivirus.vbs"
To: Userinit = "%System%\userinit.exe,"
- From: Userinit = "%System%\userinit.exe,%System%\wscript.exe %System%\FAantivirus.vbs"
Step 5
Search and delete AUTORUN.INF files created by VBS_FAKEANTIV.SM that contain these strings
[autorun]
open=wscript.exe FAantivirus.vbs
icon=%System%\SHELL32.dll,8
action=Open folder to view files
shell\open=Open
shell\open\Command=wscript.exe FAantivirus.vbs
shell\Auto=AutoPlay
shell\Auto\Command=wscript.exe FAantivirus.vbs
shell\Explore\Command=wscript.exe FAantivirus.vbs
shell\Find=Search...
shell\Find\Command=wscript.exe FAantivirus.vbs
shell\Format...=Format...
shell\Format...\Command=wscript.exe FAantivirus.vbs
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as VBS_FAKEANTIV.SM. 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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