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TSPY_INJECTOR.A

October 13, 2012
 ALIASES:

Trojan:Win32/Kexject.A (Microsoft); Generic.bfr!ec (McAfee); Trojan.Tatanarg (Symantec); Trojan.Win32.Menti.mdyl (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

302,592 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Jul 2012

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 Profile%\Application Data\Macromedia
  • %User Profile%\Macromedia\{6BD80C46-1F75-4362-BD64-32362B9BC430}
  • %User Profile%\Application Data\Apple
  • %User Profile%\Apple\{A69A638F-8A9B-4A16-986A-0EFB0A6B7417}
  • %User Profile%\Apple\{B378ACFA-D39F-4E3E-97AE-96CFA75E0BCF}
  • %User Profile%\Apple\{7E178134-7A4E-4EA1-9BFC-749A15159CCE}

(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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
KeApplet = "%User Profile%\{A69A638F-8A9B-4A16-986A-0EFB0A6B7417}\UpgradeChecker.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\System\Core2\
1

HKEY_CURRENT_USER\System\Core2\
2

HKEY_CURRENT_USER\System\Core2Inner\
2

It adds the following registry entries:

HKEY_CURRENT_USER\System\Core2
LogLevel = "fa"

HKEY_CURRENT_USER\System\Core2
CurrId = "1"

HKEY_CURRENT_USER\System\Core2
MainId = "2"

HKEY_CURRENT_USER\System\Core2
Path = "{malware path and file name}"

HKEY_CURRENT_USER\System\Core2
VerUpdate = "24"

HKEY_CURRENT_USER\System\Core2
RsData = "{random characters}"

HKEY_CURRENT_USER\System\Core2
VerSize = "24"

HKEY_CURRENT_USER\System\Core2\
1
Path = "{random characters}"

HKEY_CURRENT_USER\System\Core2\
1
Key = "2de7ee"

HKEY_CURRENT_USER\System\Core2\
1
LogLevel = "fa"

HKEY_CURRENT_USER\System\Core2\
2
Path = "{random characters}"

HKEY_CURRENT_USER\System\Core2\
2
Key = "1dfd2a8"

HKEY_CURRENT_USER\System\Core2\
2
LogLevel = "fa"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
MaxConnectionsPer1_0Server = "64"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
MaxConnectionsPerServer = "64"

HKEY_CURRENT_USER\System\Core2Inner\
2
Path = "{random characters}"

HKEY_CURRENT_USER\System\Core2Inner\
2
Key = "1dfd2a8"

HKEY_CURRENT_USER\System\Core2Inner\
2
LogLevel = "fa"

Dropping Routine

This spyware drops the following files:

  • %User Profile%\{6BD80C46-1F75-4362-BD64-32362B9BC430}\A93A21A7FD3641FBB27ACF548B6D6BCD.dat
  • %User Profile%\{A69A638F-8A9B-4A16-986A-0EFB0A6B7417}\UpgradeChecker.exe
  • %User Profile%\{B378ACFA-D39F-4E3E-97AE-96CFA75E0BCF}\692924A91C10487BA8BAE1A3D8474014.dat
  • %User Profile%\{7E178134-7A4E-4EA1-9BFC-749A15159CCE}\36765D50EB624C8EA4705896B59B26D8.dat

(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.)

Other Details

This spyware deletes itself after execution.

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

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\System\Core2
    • 1
  • In HKEY_CURRENT_USER\System\Core2
    • 2
  • In HKEY_CURRENT_USER\System\Core2Inner
    • 2

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\Windows\CurrentVersion\Run
    • KeApplet = "%User Profile%\{A69A638F-8A9B-4A16-986A-0EFB0A6B7417}\UpgradeChecker.exe"
  • In HKEY_CURRENT_USER\System\Core2
    • LogLevel = "fa"
  • In HKEY_CURRENT_USER\System\Core2
    • CurrId = "1"
  • In HKEY_CURRENT_USER\System\Core2
    • MainId = "2"
  • In HKEY_CURRENT_USER\System\Core2
    • Path = "{malware path and file name}"
  • In HKEY_CURRENT_USER\System\Core2
    • VerUpdate = "24"
  • In HKEY_CURRENT_USER\System\Core2
    • RsData = "{random characters}"
  • In HKEY_CURRENT_USER\System\Core2
    • VerSize = "24"
  • In HKEY_CURRENT_USER\System\Core2\1
    • Path = "{random characters}"
  • In HKEY_CURRENT_USER\System\Core2\1
    • Key = "2de7ee"
  • In HKEY_CURRENT_USER\System\Core2\1
    • LogLevel = "fa"
  • In HKEY_CURRENT_USER\System\Core2\2
    • Path = "{random characters}"
  • In HKEY_CURRENT_USER\System\Core2\2
    • Key = "1dfd2a8"
  • In HKEY_CURRENT_USER\System\Core2\2
    • LogLevel = "fa"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • MaxConnectionsPer1_0Server = "64"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • MaxConnectionsPerServer = "64"
  • In HKEY_CURRENT_USER\System\Core2Inner\2
    • Path = "{random characters}"
  • In HKEY_CURRENT_USER\System\Core2Inner\2
    • Key = "1dfd2a8"
  • In HKEY_CURRENT_USER\System\Core2Inner\2
    • LogLevel = "fa"

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%\{6BD80C46-1F75-4362-BD64-32362B9BC430}\A93A21A7FD3641FBB27ACF548B6D6BCD.dat
  • %User Profile%\{A69A638F-8A9B-4A16-986A-0EFB0A6B7417}\UpgradeChecker.exe
  • %User Profile%\{B378ACFA-D39F-4E3E-97AE-96CFA75E0BCF}\692924A91C10487BA8BAE1A3D8474014.dat
  • %User Profile%\{7E178134-7A4E-4EA1-9BFC-749A15159CCE}\36765D50EB624C8EA4705896B59B26D8.dat

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.
  • %User Profile%\Application Data\Macromedia
  • %User Profile%\Macromedia\{6BD80C46-1F75-4362-BD64-32362B9BC430}
  • %User Profile%\Application Data\Apple
  • %User Profile%\Apple\{A69A638F-8A9B-4A16-986A-0EFB0A6B7417}
  • %User Profile%\Apple\{B378ACFA-D39F-4E3E-97AE-96CFA75E0BCF}
  • %User Profile%\Apple\{7E178134-7A4E-4EA1-9BFC-749A15159CCE}

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_INJECTOR.A. 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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