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VBS_FAKEAV.SMW

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

Trojan.VBS.Agent.gi (Kaspersky), Worm:VBS/Slogod.L (Microsoft), VBS/Autorun.worm.k (McAfee)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan arrives by connecting affected removable drives to a system. It 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 copies of itself in all removable drives.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

VBS

Memory Resident:

Yes

Initial Samples Received Date:

15 Jun 2011

Payload:

Deletes files, Drops files, Modifies system registry

Arrival Details

This Trojan arrives by connecting affected removable drives to a system.

It 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 Trojan 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\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 component file(s):

  • {DRIVE}:\autorun.inf - detected as VBS_AUTORUN.FEG

It stays memory-resident by injecting codes into the following processes:

  • wscript.exe

Autostart Technique

This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:

HKLM\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 Trojan deletes the following files:

  • %SYSTEM%\8bu.exe
  • %SYSTEM%\New Folder.exe
  • %SYSTEM%\New_Folder.exe
  • %SYSTEM%\True Love.exe
  • %SYSTEM%\True_Love.doc.exe
  • %SYSTEM%\True_Love.exe
  • %SYSTEM%\autorun.inf
  • %SYSTEM%\blastclnnn.exe
  • %SYSTEM%\boot.vbs
  • %SYSTEM%\dxdlg.exe
  • %SYSTEM%\hb1.com
  • %SYSTEM%\kinza.exe
  • %SYSTEM%\sccvhsot.exe
  • %SYSTEM%\scvvhsot.exe
  • %SYSTEM%\sevhost.com
  • %SYSTEM%\sevhost.exe
  • %SYSTEM%\ssvchost.exe
  • %SYSTEM%\true_love.exe
  • %SYSTEM%\wprop.exe
  • %WINDOWS%\8bu.exe
  • %WINDOWS%\New Folder.exe
  • %WINDOWS%\New_Folder.exe
  • %WINDOWS%\True Love.exe
  • %WINDOWS%\True_Love.doc.exe
  • %WINDOWS%\True_Love.exe
  • %WINDOWS%\blastclnnn.exe
  • %WINDOWS%\boot.vbs
  • %WINDOWS%\dxdlg.exe
  • %WINDOWS%\hb1.com
  • %WINDOWS%\kinza.exe
  • %WINDOWS%\sccvhsot.exe
  • %WINDOWS%\scvvhsot.exe
  • %WINDOWS%\sevhost.com
  • %WINDOWS%\sevhost.exe
  • %WINDOWS%\ssvchost.exe
  • %WINDOWS%\true_love.exe
  • %WINDOWS%\wprop.exe
  • {DRIVE}:\ravmon.exe
  • {DRIVE}:\autorun.inf
  • {DRIVE}:\sxs.exe
  • {DRIVE}:\kinza.exe
  • {DRIVE}:\SCVVHSOT.exe
  • {DRIVE}:\New Folder.exe
  • {DRIVE}:\Autorun.inf
  • {DRIVE}:\isetup.exe
  • {DRIVE}:\explorer.exe
  • {DRIVE}:\smss.exe
  • {DRIVE}:\winfile.exe
  • {DRIVE}:\run.wsh
  • %SYSTEM ROOT%\killvbs.vbs
  • %SYSTEM ROOT%\VirusRemoval.vbs
  • %SYSTEM ROOT%\CleanVirus.vbs
  • %SYSTEM ROOT%\Boot.vbs
  • %SYSTEM ROOT%\Program Files\Bonjour\mdnsNSP.dll
  • %SYSTEM ROOT%\Program Files\Bonjour\mdnsResponder.exe

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\
Explorer
NoFolderOptions = "0"

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\System
DisableCMD = "0"

HKLM\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
CurrentBuild = "1.511.1 () (Obsolete data - do not use)"

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 {User Defined}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
ProductId = "55274-640-1011873-23573"

(Note: The default value data of the said registry entry is {User Product ID}.)

Propagation

This Trojan drops copies of itself in all removable drives.

NOTES:
The deleted files are the usual malware names used by other malware when dropping in the system. This malware deletes other malware in the affected system.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.226.05

FIRST VSAPI PATTERN DATE:

15 Jun 2011

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 the malware/grayware file that dropped/downloaded VBS_FAKEAV.SMW

Step 3

Terminate a malware/grayware process

[ Learn More ]

*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.

    • wscript.exe

Step 4

Delete this registry value

[ Learn More ]

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
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    • DisableTaskMgr=0
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    • DisableRegistryTools=0
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoFolderOptions=0
  • In HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System
    • DisableCMD=0
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
    • CheckedValue=1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
    • CurrentBuild=1.511.1 () (Obsolete data - do not use)

Step 5

Restore this modified registry value

[ Learn More ]

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 HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: Userinit=%System%\userinit.exe, %System%\wscript.exe  %System%\FAantivirus.vbs
      To: Userinit=%System%\userinit.exe,
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • From: Start Page=http://www.{BLOCKED}o.fusionace.com
      To: Start Page={User Define}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
    • From: ProductId=55274-640-1011873-23573
      To: ProductId={User Product ID}

Step 6

Scan your computer with your Trend Micro product to delete files detected as VBS_FAKEAV.SMW. 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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