TROJ_FAVADD.SMI

October 05, 2013
 ALIASES:

TrojanDownloader:Win32/VB.PX (Microsoft); :Generic.tfr!o (McAfee); Trojan-Dropper.Win32.VB.bbdf, Trojan-Dropper.Win32.VB.bbdf (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.6668712 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan 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:

192,512 bytes

File Type:

EXE

Initial Samples Received Date:

01 Oct 2011

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This Trojan deletes the following files:

  • %Temporary Internet Files%\Content.IE5\2TPM8950\vplay[1].htm

(Note: %Temporary Internet Files% is the Temporary Internet Files folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temporary Internet Files on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Microsoft\Windows\Temporary Internet Files on Windows Vista and 7.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hdh

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hdh\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hdh\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.hdh

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hyx

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hyx\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hyx\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.hyx

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hpf

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hpf\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hpf\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.hpf

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
htb

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
htb\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
htb\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.htb

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
h35

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
h35\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
h35\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.h35

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hli

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hli\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
hli\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.hli

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
{871C5380-42A0-1069-A2EA-08002B30309D} = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
{871C5380-42A0-1069-A2EA-08002B30309D} = 1

Dropping Routine

This Trojan drops the following files:

  • %Desktop%\Internet Expleror.hdh
  • %Desktop%\?????.hyx
  • %System Root%\jies.bak.vbs
  • %System Root%\vplay.exe

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %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

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

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_LOCAL_MACHINE\SOFTWARE\Classes
    • hdh
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\hdh
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\hdh\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .hdh
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • hyx
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\hyx
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\hyx\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .hyx
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • hpf
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\hpf
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\hpf\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .hpf
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • htb
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\htb
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\htb\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .htb
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • h35
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\h35
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\h35\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .h35
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • hli
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\hli
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\hli\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .hli
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
    • ClassicStartMenu
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
    • NewStartPanel

    To delete the registry key this malware/grayware created:

    1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
    2. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes
    3. Still in the left panel, locate and delete the key:
      hdh
    4. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>hdh
    5. Still in the left panel, locate and delete the key:
      DefaultIcon
    6. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>hdh>shell>open
    7. Still in the left panel, locate and delete the key:
      command
    8. Again Still in the left panel, locate and delete the key:
      .hdh
    9. Again Still in the left panel, locate and delete the key:
      hyx
    10. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>hyx
    11. Still in the left panel, locate and delete the key:
      DefaultIcon
    12. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>hyx>shell>open
    13. Still in the left panel, locate and delete the key:
      command
    14. Again Still in the left panel, locate and delete the key:
      .hyx
    15. Again Still in the left panel, locate and delete the key:
      hpf
    16. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>hpf
    17. Still in the left panel, locate and delete the key:
      DefaultIcon
    18. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>hpf>shell>open
    19. Still in the left panel, locate and delete the key:
      command
    20. Again Still in the left panel, locate and delete the key:
      .hpf
    21. Again Still in the left panel, locate and delete the key:
      htb
    22. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>htb
    23. Still in the left panel, locate and delete the key:
      DefaultIcon
    24. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>htb>shell>open
    25. Still in the left panel, locate and delete the key:
      command
    26. Again Still in the left panel, locate and delete the key:
      .htb
    27. Again Still in the left panel, locate and delete the key:
      h35
    28. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>h35
    29. Still in the left panel, locate and delete the key:
      DefaultIcon
    30. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>h35>shell>open
    31. Still in the left panel, locate and delete the key:
      command
    32. Again Still in the left panel, locate and delete the key:
      .h35
    33. Again Still in the left panel, locate and delete the key:
      hli
    34. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>hli
    35. Still in the left panel, locate and delete the key:
      DefaultIcon
    36. In the left panel, double-click the following:
      HKEY_LOCAL_MACHINE>SOFTWARE>Classes>hli>shell>open
    37. Still in the left panel, locate and delete the key:
      command
    38. Again Still in the left panel, locate and delete the key:
      .hli
    39. In the left panel, double-click the following:
      HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>HideDesktopIcons
    40. Still in the left panel, locate and delete the key:
      ClassicStartMenu
    41. Again Still in the left panel, locate and delete the key:
      NewStartPanel
    42. Close Registry Editor.

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\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\ClassicStartMenu
    • {871C5380-42A0-1069-A2EA-08002B30309D}=1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\NewStartPanel
    • {871C5380-42A0-1069-A2EA-08002B30309D}=1

Step 4

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.
  • %Desktop%\Internet Expleror.hdh
  • %Desktop%\?????.hyx
  • %System Root%\jies.bak.vbs
  • %System Root%\vplay.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_FAVADD.SMI. 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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