TROJ_PINCAV.SMX


 ALIASES:

VirTool:Win32/CeeInject.gen!AZ (Microsoft); Generic PWS.y!1bv (McAfee); Adware.StartPage (Symantec); PAK:Petite, Trojan-Spy.Win32.BHO.pe (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.5840357 (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:

65,536 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

13 Jun 2012

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 adds the following registry keys:

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

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

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

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\
DefaultIcon

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\
Shell

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\
Shell\D

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\
Shell\D\Command

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\
Shell\Open

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\
Shell\Open\Command

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\
Shell\??

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\
Shell\??\Command

HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\
ShellFolder

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell\
??

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell\
??\Command

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Desktop\NameSpace\{86AEFBE8-763F-0647-899C-A93278894599}

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"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\ShellFolder
Attributes = "a"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}y.com/?100082"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}y.com/?100082"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home.)

Dropping Routine

This Trojan drops the following files:

  • %System%\update.reg

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
    • HideDesktopIcons
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
    • ClassicStartMenu
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
    • NewStartPanel
  • In HKEY_CLASSES_ROOT\CLSID
    • {86AEFBE8-763F-0647-899C-A93278894599}
  • In HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}
    • DefaultIcon
  • In HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}
    • Shell
  • In HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell
    • D
  • In HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell\D
    • Command
  • In HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell
    • Open
  • In HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell\Open
    • Command
  • In HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell
    • ??
  • In HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell\??
    • Command
  • In HKEY_CLASSES_ROOT\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}
    • ShellFolder
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell
    • ??
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\Shell\??
    • Command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace
    • {86AEFBE8-763F-0647-899C-A93278894599}

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"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{86AEFBE8-763F-0647-899C-A93278894599}\ShellFolder
    • Attributes = "a"

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • From: Start Page = "http://www.{BLOCKED}y.com/?100082"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
    • From: Start Page = "http://www.{BLOCKED}y.com/?100082"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home""

Step 5

Search and delete this file

[ Learn More ]
There may be some 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%\update.reg

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_PINCAV.SMX. 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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