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TSPY_BANKER.YWNJJ

August 07, 2015
 ALIASES:

Trojan:Win32/PossibleMalware.A (Microsoft); RDN/Generic.grp!il (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Agent.neseuc (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This spyware 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:

454,272 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Aug 2015

Arrival Details

This spyware 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 spyware creates the following folders:

  • %User Temp%\Hs_
  • %Favorites%\¿¬°á
  • %User Profile%\Application Data\User Pinned
  • %User Profile%\User Pinned\StartMenu
  • %Application Data%\Criteo

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Favorites% is the Favorites folder, where it usually is C:\Documents and Settings\{user name}\Favorites on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Favorites on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Autostart Technique

This spyware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
28194751 = "%System Root%\4.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
syotom = "%System%\attrib.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Wiseman = "%System Root%\5.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Settings

HKEY_CURRENT_USER\Software\Microsoft\
WisemanSupport

HKEY_CURRENT_USER\Software\Microsoft\
WisemanSupport\userset

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\attrib.exe = "%System%\attrib.exe:*:Enabled:Sevsl"

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Settings
JITDebug = "0"

HKEY_CURRENT_USER\Software\Microsoft\
WisemanSupport
wms_load = "7-1"

HKEY_CURRENT_USER\Software\Microsoft\
WisemanSupport
keycountperday = "0"

HKEY_CURRENT_USER\Software\Microsoft\
WisemanSupport
urlcountperday = "0"

HKEY_CURRENT_USER\Software\Microsoft\
WisemanSupport
ici = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
WisemanSupport
CriteoToast_ct_exe = "6c"

HKEY_CURRENT_USER\Software\Microsoft\
WisemanSupport
CriteoToast_ct_ini = "6a"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "www.naver.com"

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

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
WisemanSupport\ru

Dropping Routine

This spyware drops the following files:

  • %System Root%\4.exe
  • %System Root%\5.exe
  • %User Temp%\58b8052567ade6540adf05ec8d813970.zip
  • %Application Data%\auction.ico
  • %Desktop%\¿Á¼Ç.url
  • %Favorites%\¿Á¼Ç.url
  • %Favorites%\¿¬°á\¿Á¼Ç.url
  • %Favorites%\Links\¿Á¼Ç.url
  • %Start Menu%\¿Á¼Ç.url
  • %User Profile%\StartMenu\¿Á¼Ç.url
  • %User Profile%\Application Data\¿Á¼Ç.url
  • %Application Data%\¿Á¼Ç.lnk
  • %Application Data%\11st.ico
  • %Desktop%\11¹ø°¡.url
  • %Favorites%\11¹ø°¡.url
  • %Favorites%\¿¬°á\11¹ø°¡.url
  • %Favorites%\Links\11¹ø°¡.url
  • %Start Menu%\11¹ø°¡.url
  • %User Profile%\StartMenu\11¹ø°¡.url
  • %User Profile%\Application Data\11¹ø°¡.url
  • %Application Data%\11¹ø°¡.lnk
  • %Application Data%\gmarket.ico
  • %Desktop%\G¸¶ÄÏ.url
  • %Favorites%\G¸¶ÄÏ.url
  • %Favorites%\¿¬°á\G¸¶ÄÏ.url
  • %Favorites%\Links\G¸¶ÄÏ.url
  • %Start Menu%\G¸¶ÄÏ.url
  • %User Profile%\StartMenu\G¸¶ÄÏ.url
  • %User Profile%\Application Data\G¸¶ÄÏ.url
  • %Application Data%\G¸¶ÄÏ.lnk
  • %Application Data%\Wiseman\WisemanUpdate.exe
  • %Application Data%\Criteo\criteo.exe
  • %Application Data%\Criteo\criteosynd.ini

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Favorites% is the Favorites folder, where it usually is C:\Documents and Settings\{user name}\Favorites on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Favorites on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This spyware connects to the following possibly malicious URL:

  • http://{BLOCKED}.38.8
  • http://api.{BLOCKED}nsupport.com/wms/inf.php?pid=defapp&cid=0050569f71ec
  • http://api.{BLOCKED}nsupport.com/wms/log.php?{random characters}
  • http://api.{BLOCKED}hing.co.kr/{BLOCKED}hing/matchsitelist.php?pid=defapp&cid=0050569f71ec
  • http://api.{BLOCKED}hing.co.kr/{BLOCKED}hing/urlmatchlist.php?pid=defapp&cid=0050569f71ec
  • http://api.{BLOCKED}nsupport.com/wms/exdom.php
  • http://api.{BLOCKED}nsupport.com/wms/bc.php?pid=defapp&mac=0050569f71ec
  • http://api.{BLOCKED}nsupport.com/wms/ico/auction.ico
  • http://api.{BLOCKED}nsupport.com/wms/ico/11st.ico
  • http://api.{BLOCKED}nsupport.com/wms/ico/gmarket.ico
  • http://api.{BLOCKED}nsupport.com/wms/upd.php?pid=defapp&cid=0050569f71ec
  • http://api.{BLOCKED}nsupport.com/wms/df/WisemanUpdate.exe
  • http://api.{BLOCKED}nsupport.com/wms/df/criteo.exe
  • http://api.{BLOCKED}nsupport.com/wms/df/criteosynd.ini
  • {BLOCKED}0.1
  • {BLOCKED}.9.152
  • {BLOCKED}6.166.175

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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

Restart in Safe Mode

[ Learn More ]

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\Windows Script
    • Settings
  • In HKEY_CURRENT_USER\Software\Microsoft
    • WisemanSupport
  • In HKEY_CURRENT_USER\Software\Microsoft\WisemanSupport
    • userset

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • 28194751 = "%System Root%\4.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • syotom = "%System%\attrib.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Wiseman = "%System Root%\5.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System%\attrib.exe = "%System%\attrib.exe:*:Enabled:Sevsl"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows Script\Settings
    • JITDebug = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\WisemanSupport
    • wms_load = "7-1"
  • In HKEY_CURRENT_USER\Software\Microsoft\WisemanSupport
    • keycountperday = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\WisemanSupport
    • urlcountperday = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\WisemanSupport
    • ici = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\WisemanSupport
    • CriteoToast_ct_exe = "6c"
  • In HKEY_CURRENT_USER\Software\Microsoft\WisemanSupport
    • CriteoToast_ct_ini = "6a"

Step 5

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 = "www.naver.com"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""

Step 6

Search and delete these components

[ Learn More ]
There may be some components 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 Root%\4.exe
  • %System Root%\5.exe
  • %User Temp%\58b8052567ade6540adf05ec8d813970.zip
  • %Application Data%\auction.ico
  • %Desktop%\¿Á¼Ç.url
  • %Favorites%\¿Á¼Ç.url
  • %Favorites%\¿¬°á\¿Á¼Ç.url
  • %Favorites%\Links\¿Á¼Ç.url
  • %Start Menu%\¿Á¼Ç.url
  • %User Profile%\StartMenu\¿Á¼Ç.url
  • %User Profile%\Application Data\¿Á¼Ç.url
  • %Application Data%\¿Á¼Ç.lnk
  • %Application Data%\11st.ico
  • %Desktop%\11¹ø°¡.url
  • %Favorites%\11¹ø°¡.url
  • %Favorites%\¿¬°á\11¹ø°¡.url
  • %Favorites%\Links\11¹ø°¡.url
  • %Start Menu%\11¹ø°¡.url
  • %User Profile%\StartMenu\11¹ø°¡.url
  • %User Profile%\Application Data\11¹ø°¡.url
  • %Application Data%\11¹ø°¡.lnk
  • %Application Data%\gmarket.ico
  • %Desktop%\G¸¶ÄÏ.url
  • %Favorites%\G¸¶ÄÏ.url
  • %Favorites%\¿¬°á\G¸¶ÄÏ.url
  • %Favorites%\Links\G¸¶ÄÏ.url
  • %Start Menu%\G¸¶ÄÏ.url
  • %User Profile%\StartMenu\G¸¶ÄÏ.url
  • %User Profile%\Application Data\G¸¶ÄÏ.url
  • %Application Data%\G¸¶ÄÏ.lnk
  • %Application Data%\Wiseman\WisemanUpdate.exe
  • %Application Data%\Criteo\criteo.exe
  • %Application Data%\Criteo\criteosynd.ini

Step 7

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.
  • %User Temp%\Hs_
  • %Favorites%\¿¬°á
  • %User Profile%\Application Data\User Pinned
  • %User Profile%\User Pinned\StartMenu
  • %Application Data%\Criteo

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_BANKER.YWNJJ. 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 these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Microsoft\WisemanSupport
    • ru


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