TROJ_AGENT_013564.TOMB


 ALIASES:

Trojan:Win32/Startpage.MP (Microsoft); Generic StartPage!bcn (McAfee); Trojan.Startpage (Symantec); Trojan.Win32.StartPage.afwn (Kaspersky); Trojan.Win32.StartPage.agac (v) (Sunbelt); Trojan.StartPage.ZSD (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:

135,680 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

21 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.

Installation

This Trojan creates the following folders:

  • %Program Files%\Internet Explorer\MUI
  • %Program Files%\Thunder
  • %Program Files%\Thunder\ComDlls\1143

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\Frist

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.ura1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura1file

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura1file\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura1file\ScriptEngine

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura1file\shell

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura1file\shell\open

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura1file\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.ura2

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura2file

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura2file\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura2file\ScriptEngine

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura2file\shell

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura2file\shell\open

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ura2file\shell\open\
command

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.msm4

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
msm4file

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
msm4file\DefaultIcon

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
msm4file\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
msm4file\ScriptEngine

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
msm4file\shell

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
msm4file\shell\open

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
msm4file\shell\open\
command

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Toolbar\WebBrowser
ITBar7Layout = "{random values}"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Toolbar\WebBrowser
ITBarLayout = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
HTTP
EditFlags = "2"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
https
EditFlags = "2"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
ftp
EditFlags = "2"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
gopher
EditFlags = "2"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
InternetShortcut
EditFlags = "2"

(Note: The default value data of the said registry entry is 2.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FBF23B40-E3F0-101B-8488-00AA003E56F8}\InProcServer32
ThreadingModel = "Apartment"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.htm
Content Type = "text/html"

(Note: The default value data of the said registry entry is text/html.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.html
Content Type = "text/html"

(Note: The default value data of the said registry entry is text/html.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
InternetShortcut\shell\open
CLSID = "{FBF23B40-E3F0-101B-8488-00AA003E56F8}"

(Note: The default value data of the said registry entry is {FBF23B40-E3F0-101B-8488-00AA003E56F8}.)

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\mm.ico
  • %User Profile%\game.ico
  • %User Profile%\taobao.ico
  • %User Profile%\movie.ico
  • %System Root%\b.txt
  • %User Temp%\TMP4352$.TMP
  • %User Temp%\RGI1.tmp
  • %Program Files%\Thunder\9.exe
  • %Windows%\Downloaded Program Files\taobao.ico
  • %Windows%\Downloaded Program Files\game.ico
  • %Windows%\Downloaded Program Files\movie.ico
  • %Windows%\Downloaded Program Files\mm.ico
  • %Windows%\Downloaded Program Files\Update.exe
  • %Desktop%\ÌÔ±¦Íø.ura1
  • %Desktop%\ÔÚÏßСÓÎÏ·.ura2
  • %Favorites%\×îм«Æ·ÂÌÉ«ºÃµÄµçÓ°¿âÃâ·Ñ.¸ßÇå¸ßËÙ£¡ÌìÌì¸üÐÂ!!.html
  • %Favorites%\Öйú¸£Àû²ÊƱ£¬ÌåÓý²ÊƱµÄͶעÖÐÐÄ.²ÊƱ´óÓ®¼Ò£¡.html
  • %Favorites%\×îÐÂÔÚÏßС˵Ãâ·ÑµÄÔĶÁ.·á¸»ÄÚÈÝËٶȿìµÄС˵վ!.html
  • %Favorites%\ÌÔ±¦Íø - ÌÔ£¡ÎÒϲ»¶.html
  • %Favorites%\45575.comÔÚÏßµÄСÓÎÏ·.×îºÃÍæ×îÐÂ×î¿ì¿á³¬¼¶Ð¡ÓÎÏ·!.html
  • %Favorites%\µ±µ±Íø¡ªÍøÉϹºÎïÖÐÐÄ.html
  • %Favorites%\׿ԽÑÇÂíÑ·ÍøÉϹºÎïͼÊ飬ÊÖ»ú£¬ÊýÂ룬¼Òµç£¬»¯×±Æ·£¬ÖÓ±í£¬Ê×ÊεÈÔÚÏßÏúÊÛ.html
  • %Favorites%\¿´¿´µçÊÓ¾çÔÚÏß´óÈ«,,,×îºÃÂÌÉ«×îиßËÙÃâ·ÑµçÊÓ¾çÍøÕ¾!.html
  • %Favorites%\¼õ·Ê£¡¿ìµ½ÈÃÄã&¼â½Ð£¡ºþÄÏÎÀÊÓÍƼö×óÐýÈâ¼î¼õ·Ê!.html
  • %Favorites%\°¬³ÈÍŹº - ¾«Æ·ÍŹºÃ¿Ò»Ì칺ÎïÍŹº´òÕÛ!.html
  • %Favorites%\ÃÀÅ®·áÐØ´óÃؾ÷-20ÌìÄÚѸËÙÔö´ó´ó´ó!.html
  • %Favorites%\°¬³ÈÅ®×°--×îÃÀÀöʱÉеÄÅ®×°Æ·ÅÆ.ÃÀÅ®ÂòÒ£¬Ãëɱ°¬³ÈÅ®×°!!.html
  • %Favorites%\Á´½Ó\ÍøÖ·µ¼º½.html
  • %Favorites%\Á´½Ó\¸£²ÊÌå²Ê.html
  • %Favorites%\Á´½Ó\¡ô ÌÔ ±¦ Íø ¡ô.html
  • %Favorites%\Á´½Ó\ºÃÍæСÓÎÏ·.html
  • %Favorites%\Á´½Ó\µ±µ±Íø.html
  • %Favorites%\Á´½Ó\׿ԽÍø.html
  • %Favorites%\Á´½Ó\¿´µçÊÓ¾ç.html
  • %Favorites%\Á´½Ó\С˵Íø.html
  • %Favorites%\Á´½Ó\µ¥»úÓÎÏ·.html
  • %Favorites%\Á´½Ó\ÍøÂçµçÊÓ.html
  • %Favorites%\Á´½Ó\×î¿ìµçÓ°.html
  • %System Root%\Documents and Settings\Administrator\Start Menu\Programs\Internet Explorer.msm4
  • %User Profile%\×ÀÃæ\Internet Explorer.msm4

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\Microsoft\Internet Explorer\Main
    • Frist
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .ura1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • ura1file
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura1file
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura1file
    • ScriptEngine
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura1file
    • shell
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura1file\shell
    • open
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura1file\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .ura2
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • ura2file
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura2file
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura2file
    • ScriptEngine
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura2file
    • shell
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura2file\shell
    • open
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ura2file\shell\open
    • command
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .msm4
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • msm4file
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\msm4file
    • DefaultIcon
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\msm4file
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\msm4file
    • ScriptEngine
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\msm4file
    • shell
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\msm4file\shell
    • open
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\msm4file\shell\open
    • command

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\Internet Explorer\Toolbar\WebBrowser
    • ITBar7Layout = "{random values}"

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_CURRENT_USER\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser
    • From: ITBarLayout = "{random values}"
      To: ITBarLayout = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\HTTP
    • From: EditFlags = "2"
      To: EditFlags = ""2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\https
    • From: EditFlags = "2"
      To: EditFlags = ""2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\ftp
    • From: EditFlags = "2"
      To: EditFlags = ""2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\gopher
    • From: EditFlags = "2"
      To: EditFlags = ""2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\InternetShortcut
    • From: EditFlags = "2"
      To: EditFlags = ""2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FBF23B40-E3F0-101B-8488-00AA003E56F8}\InProcServer32
    • From: ThreadingModel = "Apartment"
      To: ThreadingModel = ""Apartment""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.htm
    • From: Content Type = "text/html"
      To: Content Type = ""text/html""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\.html
    • From: Content Type = "text/html"
      To: Content Type = ""text/html""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\InternetShortcut\shell\open
    • From: CLSID = "{FBF23B40-E3F0-101B-8488-00AA003E56F8}"
      To: CLSID = ""{FBF23B40-E3F0-101B-8488-00AA003E56F8}""

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.
  • %User Profile%\mm.ico
  • %User Profile%\game.ico
  • %User Profile%\taobao.ico
  • %User Profile%\movie.ico
  • %System Root%\b.txt
  • %User Temp%\TMP4352$.TMP
  • %User Temp%\RGI1.tmp
  • %Program Files%\Thunder\9.exe
  • %Windows%\Downloaded Program Files\taobao.ico
  • %Windows%\Downloaded Program Files\game.ico
  • %Windows%\Downloaded Program Files\movie.ico
  • %Windows%\Downloaded Program Files\mm.ico
  • %Windows%\Downloaded Program Files\Update.exe
  • %Desktop%\ÌÔ±¦Íø.ura1
  • %Desktop%\ÔÚÏßСÓÎÏ·.ura2
  • %Favorites%\×îм«Æ·ÂÌÉ«ºÃµÄµçÓ°¿âÃâ·Ñ.¸ßÇå¸ßËÙ£¡ÌìÌì¸üÐÂ!!.html
  • %Favorites%\Öйú¸£Àû²ÊƱ£¬ÌåÓý²ÊƱµÄͶעÖÐÐÄ.²ÊƱ´óÓ®¼Ò£¡.html
  • %Favorites%\×îÐÂÔÚÏßС˵Ãâ·ÑµÄÔĶÁ.·á¸»ÄÚÈÝËٶȿìµÄС˵վ!.html
  • %Favorites%\ÌÔ±¦Íø - ÌÔ£¡ÎÒϲ»¶.html
  • %Favorites%\45575.comÔÚÏßµÄСÓÎÏ·.×îºÃÍæ×îÐÂ×î¿ì¿á³¬¼¶Ð¡ÓÎÏ·!.html
  • %Favorites%\µ±µ±Íø¡ªÍøÉϹºÎïÖÐÐÄ.html
  • %Favorites%\׿ԽÑÇÂíÑ·ÍøÉϹºÎïͼÊ飬ÊÖ»ú£¬ÊýÂ룬¼Òµç£¬»¯×±Æ·£¬ÖÓ±í£¬Ê×ÊεÈÔÚÏßÏúÊÛ.html
  • %Favorites%\¿´¿´µçÊÓ¾çÔÚÏß´óÈ«,,,×îºÃÂÌÉ«×îиßËÙÃâ·ÑµçÊÓ¾çÍøÕ¾!.html
  • %Favorites%\¼õ·Ê£¡¿ìµ½ÈÃÄã&¼â½Ð£¡ºþÄÏÎÀÊÓÍƼö×óÐýÈâ¼î¼õ·Ê!.html
  • %Favorites%\°¬³ÈÍŹº - ¾«Æ·ÍŹºÃ¿Ò»Ì칺ÎïÍŹº´òÕÛ!.html
  • %Favorites%\ÃÀÅ®·áÐØ´óÃؾ÷-20ÌìÄÚѸËÙÔö´ó´ó´ó!.html
  • %Favorites%\°¬³ÈÅ®×°--×îÃÀÀöʱÉеÄÅ®×°Æ·ÅÆ.ÃÀÅ®ÂòÒ£¬Ãëɱ°¬³ÈÅ®×°!!.html
  • %Favorites%\Á´½Ó\ÍøÖ·µ¼º½.html
  • %Favorites%\Á´½Ó\¸£²ÊÌå²Ê.html
  • %Favorites%\Á´½Ó\¡ô ÌÔ ±¦ Íø ¡ô.html
  • %Favorites%\Á´½Ó\ºÃÍæСÓÎÏ·.html
  • %Favorites%\Á´½Ó\µ±µ±Íø.html
  • %Favorites%\Á´½Ó\׿ԽÍø.html
  • %Favorites%\Á´½Ó\¿´µçÊÓ¾ç.html
  • %Favorites%\Á´½Ó\С˵Íø.html
  • %Favorites%\Á´½Ó\µ¥»úÓÎÏ·.html
  • %Favorites%\Á´½Ó\ÍøÂçµçÊÓ.html
  • %Favorites%\Á´½Ó\×î¿ìµçÓ°.html
  • %System Root%\Documents and Settings\Administrator\Start Menu\Programs\Internet Explorer.msm4
  • %User Profile%\×ÀÃæ\Internet Explorer.msm4

Step 6

Search and delete these folders

[ 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.
  • %Program Files%\Internet Explorer\MUI
  • %Program Files%\Thunder
  • %Program Files%\Thunder\ComDlls\1143

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT_013564.TOMB. 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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