ALIASES:

Trojan:Win32/Orsam!rts (Microsoft); BackDoor-DRV.gen.c (McAfee); ARC:Embedded (Kaspersky); Trojan.Win32.Autorun.dm (v) (Sunbelt); Trojan:W32/Agent.DQOD (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.

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size: 1,259,934 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 25 Nov 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:

  • %User Profile%\My Documents\΢ÈíÎå±ÊÊäÈë·¨86°æ.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It creates the following folders:

  • %User Temp%\zhichiku

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

Other System Modifications

This worm deletes the following files:

  • %User Temp%\nsd1.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\MenuExt\¡¾°Ù¶ÈÒ»ÏÂ,Äã¾ÍÖªµÀ¡¿

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Keyboard Layouts\E0200804

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
ButtonText = "°Ù¶ÈÒ»ÏÂ,Äã¾ÍÖªµÀ"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
CLSID = "{1FBA04EE-3024-11d2-8F1F-0000F87ABD16}"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
Default Visible = "yes"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
Exec = "http://www.{BLOCKED}u.com/index.php?tn=mm667_pg"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
HotIcon = "%Windows%\baidu.ico"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
Icon = "%Windows%\baidu.ico"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\MenuExt\¡¾°Ù¶ÈÒ»ÏÂ,Äã¾ÍÖªµÀ¡¿
Contexts = "3"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
ENTER = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
SPACE = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
FC aid = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
FC Input = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
GB/GBK = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
²å¿Õ¸ñ = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
´ÊÓïÁªÏë = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
´ÊÓïÊäÈë = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
¹â±ê¸úËæ = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
ÍâÂëÌáʾ = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Îå±ÊÐÍ
Öð½¥Ìáʾ = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Keyboard Layouts\E0200804
Ime File = "WINWB86.IME"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Keyboard Layouts\E0200804
Layout Text = "ÍõÂëÎå±ÊÐÍÊäÈë·¨86°æ"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Keyboard Layouts\E0200804
Layout File = "kbdus.dll"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}u.com/index.php?tn=mm667_pg"

(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\Search
SearchAssistant = "http://www.{BLOCKED}0.com/Search.html"

(Note: The default value data of the said registry entry is http://ie.search.msn.com/{SUB_RFC1766}/srchasst/srchasst.htm.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Search
CustomizeSearch = "http://www.{BLOCKED}0.com/Search.html"

(Note: The default value data of the said registry entry is http://ie.search.msn.com/{SUB_RFC1766}/srchasst/srchcust.htm.)

HKEY_CURRENT_USER\Keyboard Layout\Preload
2 = "E0200804"

(Note: The default value data of the said registry entry is e00e0804.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi
LogSessionName = "stdout"

(Note: The default value data of the said registry entry is {random values}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi
Active = "1"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi
ControlFlags = "1"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi\ImapiSvc
Guid = "8107d8e9-e323-49f5-bba2-abc35c243dca"

(Note: The default value data of the said registry entry is 8107d8e9-e323-49f5-bba2-abc35c243dca.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi\ImapiSvc
BitNames = "{random characters}"

(Note: The default value data of the said registry entry is ImapiDebugError ImapiDebugWarning ImapiDebugTrace ImapiDebugInfo ImapiDebugX ImapiDebugSort.)

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoInternetIcon = "1"

Dropping Routine

This worm drops the following files:

  • %User Temp%\zhichiku\krnln.fnr
  • %User Temp%\zhichiku\shell.fne
  • %User Temp%\zhichiku\eAPI.fne
  • %User Temp%\zhichiku\HtmlView.fne
  • %User Temp%\zhichiku\ERawSock.fne
  • %User Temp%\wb2008.exe
  • %Windows%\baidu.ico
  • %System%\baidu.htm
  • %Favorites%\¨y¨z¨¨}¨€ ÉÏÍøµ¼º½.lnk
  • %Favorites%\¡¾ °Ù¶ÈÊ×Ò³ ¡¿.lnk
  • %Desktop%\Internet Explorer.lnk
  • %User Temp%\nsd2.tmp
  • %System%\Wb86_Reg.exe
  • %System%\Winwb86.IME
  • %System%\WINWB86.MB
  • %Windows%\help\WINWB86.CHM
  • %Temp%\046wsp6b.TMP

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %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.. %Favorites% is the current user's Favorites folder, which is usually C:\Windows\Favorites on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Favorites on Windows NT, and C:\Documents and Settings\{user name}\Favorites on Windows 2000, XP, and Server 2003.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.300

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

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware.

Step 3

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\Internet Explorer\Extensions
    • {F2C63239-A5DB-487B-B283-4132351E7AB6}
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\MenuExt
    • ¡¾°Ù¶ÈÒ»ÏÂ,Äã¾ÍÖªµÀ¡¿
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • Îå±ÊÐÍ
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Keyboard Layouts
    • E0200804

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\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
    • ButtonText = "°Ù¶ÈÒ»ÏÂ,Äã¾ÍÖªµÀ"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
    • CLSID = "{1FBA04EE-3024-11d2-8F1F-0000F87ABD16}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
    • Default Visible = "yes"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
    • Exec = "http://www.{BLOCKED}u.com/index.php?tn=mm667_pg"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
    • HotIcon = "%Windows%\baidu.ico"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{F2C63239-A5DB-487B-B283-4132351E7AB6}
    • Icon = "%Windows%\baidu.ico"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\MenuExt\¡¾°Ù¶ÈÒ»ÏÂ,Äã¾ÍÖªµÀ¡¿
    • Contexts = "3"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • ENTER = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • SPACE = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • FC aid = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • FC Input = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • GB/GBK = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • ²å¿Õ¸ñ = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • ´ÊÓïÁªÏë = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • ´ÊÓïÊäÈë = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • ¹â±ê¸úËæ = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • ÍâÂëÌáʾ = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Îå±ÊÐÍ
    • Öð½¥Ìáʾ = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Keyboard Layouts\E0200804
    • Ime File = "WINWB86.IME"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Keyboard Layouts\E0200804
    • Layout Text = "ÍõÂëÎå±ÊÐÍÊäÈë·¨86°æ"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Keyboard Layouts\E0200804
    • Layout File = "kbdus.dll"

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 HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • From: Start Page = "http://www.{BLOCKED}u.com/index.php?tn=mm667_pg"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Search
    • From: SearchAssistant = "http://www.{BLOCKED}0.com/Search.html"
      To: SearchAssistant = ""http://ie.search.msn.com/{SUB_RFC1766}/srchasst/srchasst.htm""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Search
    • From: CustomizeSearch = "http://www.{BLOCKED}0.com/Search.html"
      To: CustomizeSearch = ""http://ie.search.msn.com/{SUB_RFC1766}/srchasst/srchcust.htm""
  • In HKEY_CURRENT_USER\Keyboard Layout\Preload
    • From: 2 = "E0200804"
      To: 2 = ""e00e0804""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi
    • From: LogSessionName = "stdout"
      To: LogSessionName = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi
    • From: Active = "1"
      To: Active = ""1""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi
    • From: ControlFlags = "1"
      To: ControlFlags = ""1""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi\ImapiSvc
    • From: Guid = "8107d8e9-e323-49f5-bba2-abc35c243dca"
      To: Guid = ""8107d8e9-e323-49f5-bba2-abc35c243dca""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi\ImapiSvc
    • From: BitNames = "{random characters}"
      To: BitNames = "" ImapiDebugError ImapiDebugWarning ImapiDebugTrace ImapiDebugInfo ImapiDebugX ImapiDebugSort""

Step 6

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.
  • %User Temp%\zhichiku\krnln.fnr
  • %User Temp%\zhichiku\shell.fne
  • %User Temp%\zhichiku\eAPI.fne
  • %User Temp%\zhichiku\HtmlView.fne
  • %User Temp%\zhichiku\ERawSock.fne
  • %User Temp%\wb2008.exe
  • %Windows%\baidu.ico
  • %System%\baidu.htm
  • %Favorites%\¨y¨z¨¨}¨€ ÉÏÍøµ¼º½.lnk
  • %Favorites%\¡¾ °Ù¶ÈÊ×Ò³ ¡¿.lnk
  • %Desktop%\Internet Explorer.lnk
  • %User Temp%\nsd2.tmp
  • %System%\Wb86_Reg.exe
  • %System%\Winwb86.IME
  • %System%\WINWB86.MB
  • %Windows%\help\WINWB86.CHM
  • %Temp%\046wsp6b.TMP

Step 7

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.
  • %User Temp%\zhichiku

Step 8

Scan your computer with your Trend Micro product to delete files detected as WORM_AUTORUN.AWK. 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 9

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.

  • %User Temp%\nsd1.tmp


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