WORM_AUTORUN.FBY


 ALIASES:

Worm:Win32/Autorun.RR (Microsoft); W32/Autorun.worm.h (McAfee); W32.SillyDC (Symantec); PAK:UPX, Worm.Win32.AutoRun.ftj, Worm.Win32.AutoRun.ftj (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Worm.Generic.75376 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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

File Size:

273,575 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 Apr 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 creates the following folders:

  • %System Root%\RECYCLER

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other System Modifications

This worm deletes the following files:

  • %System%\nod32krn.exe
  • %Temp%\scs1.tmp
  • %Temp%\scs2.tmp
  • %Temp%\scs3.tmp
  • %Temp%\scs4.tmp
  • %Temp%\scs5.tmp
  • %Temp%\scs6.tmp

(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.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
VB6 API Loader\AppSettings

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{6CBA02B2-40D4-4AF6-B2D6-7E5AD43439F9}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\mfncom.DLL

HKEY_CLASSES_ROOT\mfncom.MFNHTTPCtrl.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
mfncom.MFNHTTPCtrl.1\CLSID

HKEY_CLASSES_ROOT\mfncom.MFNHTTPCtrl

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
mfncom.MFNHTTPCtrl\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
mfncom.MFNHTTPCtrl\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{8CFADADE-AF49-4E77-91EE-FE20037589C9}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{8CFADADE-AF49-4E77-91EE-FE20037589C9}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{8CFADADE-AF49-4E77-91EE-FE20037589C9}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{8CFADADE-AF49-4E77-91EE-FE20037589C9}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1782E3A4-71BF-4B77-9B36-BC98CFD51C67}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1782E3A4-71BF-4B77-9B36-BC98CFD51C67}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1782E3A4-71BF-4B77-9B36-BC98CFD51C67}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1782E3A4-71BF-4B77-9B36-BC98CFD51C67}\TypeLib

HKEY_CURRENT_USER\software\MadeForNet\
HTTPDebuggerPro

It adds the following registry entries:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
VB6 API Loader\AppSettings
R1 = "400548"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
VB6 API Loader\AppSettings
R3 = "0"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
VB6 API Loader\AppSettings
R2 = "2088"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\mfncom.DLL
AppID = "{6CBA02B2-40D4-4AF6-B2D6-7E5AD43439F9}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}
AppID = "{6CBA02B2-40D4-4AF6-B2D6-7E5AD43439F9}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{8CFADADE-AF49-4E77-91EE-FE20037589C9}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1782E3A4-71BF-4B77-9B36-BC98CFD51C67}\TypeLib
Version = "1.0"

HKEY_CURRENT_USER\Software\MadeForNet\
HTTPDebuggerPro
SN128226241 = "6A4F957C337473E1"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\SuperHidden
UncheckedValue = "0"

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\SuperHidden
DefaultValue = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\SuperHidden
CheckedValue = "0"

Dropping Routine

This worm drops the following files:

  • %System%\tmp980801.tmp
  • %System Root%\autorun.inf

(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Delete this registry key

[ 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\VB and VBA Program Settings\VB6 API Loader
    • AppSettings
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • {6CBA02B2-40D4-4AF6-B2D6-7E5AD43439F9}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • mfncom.DLL
  • In HKEY_CLASSES_ROOT
    • mfncom.MFNHTTPCtrl.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\mfncom.MFNHTTPCtrl.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • mfncom.MFNHTTPCtrl
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\mfncom.MFNHTTPCtrl
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\mfncom.MFNHTTPCtrl
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {FD39B45D-9616-4615-8E68-D99FC6472C6C}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {73B91E0B-252F-4776-9766-18A8A8775788}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{73B91E0B-252F-4776-9766-18A8A8775788}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {8CFADADE-AF49-4E77-91EE-FE20037589C9}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{8CFADADE-AF49-4E77-91EE-FE20037589C9}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{8CFADADE-AF49-4E77-91EE-FE20037589C9}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{8CFADADE-AF49-4E77-91EE-FE20037589C9}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {1782E3A4-71BF-4B77-9B36-BC98CFD51C67}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1782E3A4-71BF-4B77-9B36-BC98CFD51C67}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1782E3A4-71BF-4B77-9B36-BC98CFD51C67}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1782E3A4-71BF-4B77-9B36-BC98CFD51C67}
    • TypeLib
  • In HKEY_CURRENT_USER\software\MadeForNet
    • HTTPDebuggerPro

Step 3

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\VB and VBA Program Settings\VB6 API Loader\AppSettings
    • R1 = "400548"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\VB6 API Loader\AppSettings
    • R3 = "0"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\VB6 API Loader\AppSettings
    • R2 = "2088"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\mfncom.DLL
    • AppID = "{6CBA02B2-40D4-4AF6-B2D6-7E5AD43439F9}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD39B45D-9616-4615-8E68-D99FC6472C6C}
    • AppID = "{6CBA02B2-40D4-4AF6-B2D6-7E5AD43439F9}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{8CFADADE-AF49-4E77-91EE-FE20037589C9}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1782E3A4-71BF-4B77-9B36-BC98CFD51C67}\TypeLib
    • Version = "1.0"
  • In HKEY_CURRENT_USER\Software\MadeForNet\HTTPDebuggerPro
    • SN128226241 = "6A4F957C337473E1"

Step 4

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 HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\SuperHidden
    • From: UncheckedValue = "0"
      To: UncheckedValue = ""1""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\SuperHidden
    • DefaultValue = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\SuperHidden
    • CheckedValue = "0"

Step 5

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %System%\tmp980801.tmp
  • %System Root%\autorun.inf

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\RECYCLER

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_AUTORUN.FBY. 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.

Step 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %System%\nod32krn.exe
  • %Temp%\scs1.tmp
  • %Temp%\scs2.tmp
  • %Temp%\scs3.tmp
  • %Temp%\scs4.tmp
  • %Temp%\scs5.tmp
  • %Temp%\scs6.tmp


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