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: 12 Jul 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.

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
MyKB = "{malware path and file name} "

Other System Modifications

This spyware deletes the following files:

  • %System Root%\_@7.tmp

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService\
SYSTEM\CurrentControlSet\Control\
Terminal Server\Licensing Core

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService\
SYSTEM\CurrentControlSet\Control\
Terminal Server\Licensing Core\SOFTWARE\
Microsoft\Windows NT\CurrentVersion\
Winlogon

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService\
SYSTEM\CurrentControlSet\Control\
Terminal Server\Licensing Core\SOFTWARE\
Microsoft\Windows NT\CurrentVersion\
Winlogon\SOFTWARE\Policies\
Microsoft\Windows NT\Terminal Services

HKEY_LOCAL_MACHINE\SOFTWARE\MyKBEX\
Patch

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
3389:TCP = "3389:TCP:*:Enabled:@xpsp2res.dll,-22009"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server
fSingleSessionPerUser = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService\
SYSTEM\CurrentControlSet\Control\
Terminal Server\Licensing Core
EnableConcurrentSessions = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService\
SYSTEM\CurrentControlSet\Control\
Terminal Server\Licensing Core\SOFTWARE\
Microsoft\Windows NT\CurrentVersion\
Winlogon
EnableConcurrentSessions = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService\
SYSTEM\CurrentControlSet\Control\
Terminal Server\Licensing Core\SOFTWARE\
Microsoft\Windows NT\CurrentVersion\
Winlogon
AllowMultipleTSSessions = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService\
SYSTEM\CurrentControlSet\Control\
Terminal Server\Licensing Core\SOFTWARE\
Microsoft\Windows NT\CurrentVersion\
Winlogon
KeepRASConnections = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server\SYSTEM\
CurrentControlSet\Services\TermService\
SYSTEM\CurrentControlSet\Control\
Terminal Server\Licensing Core\SOFTWARE\
Microsoft\Windows NT\CurrentVersion\
Winlogon\SOFTWARE\Policies\
Microsoft\Windows NT\Terminal Services
MaxInstanceCount = "2"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Terminal Server
fDenyTSConnections = "0"

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

Dropping Routine

This spyware drops the following files:

  • %System Root%\Log.txt
  • %User Temp%\Test.txt
  • %User Temp%\UTP32.exe
  • %System%\termsrv.dll.backup
  • %System%\termsrv.dll.tmp
  • %System%\dllcache\termsrv.dll
  • %System%\termsrv.dll

(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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This spyware connects to the following possibly malicious URL:

  • http://www.{BLOCKED}8.com
  • {BLOCKED}0.1

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_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services
    • TermService
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services\TermService\SYSTEM\CurrentControlSet\Control\Terminal Server
    • Licensing Core
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services\TermService\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core\SOFTWARE\Microsoft\Windows NT\CurrentVersion
    • Winlogon
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services\TermService\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SOFTWARE\Policies\Microsoft\Windows NT
    • Terminal Services
  • In HKEY_LOCAL_MACHINE\SOFTWARE\MyKBEX
    • Patch

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
    • MyKB = "{malware path and file name} "
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
    • 3389:TCP = "3389:TCP:*:Enabled:@xpsp2res.dll,-22009"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server
    • fSingleSessionPerUser = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services\TermService
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services\TermService\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core
    • EnableConcurrentSessions = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services\TermService\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • EnableConcurrentSessions = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services\TermService\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • AllowMultipleTSSessions = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services\TermService\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • KeepRASConnections = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\SYSTEM\CurrentControlSet\Services\TermService\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services
    • MaxInstanceCount = "2"

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_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server
    • From: fDenyTSConnections = "0"
      To: fDenyTSConnections = ""1""

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%\Log.txt
  • %User Temp%\Test.txt
  • %User Temp%\UTP32.exe
  • %System%\termsrv.dll.backup
  • %System%\termsrv.dll.tmp
  • %System%\dllcache\termsrv.dll
  • %System%\termsrv.dll

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_BANKER.YWNJD. 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 8

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.

  • %System Root%\_@7.tmp


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