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TSPY_AIBATOOK.B

November 13, 2013
 Analysis by: Rika Joi Gregorio
 ALIASES:

TrojanSpy:Win32/Aibatook.A(Microsoft), a variant of Win32/Spy.Aibatook.A trojan(Eset)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This spyware may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

103,424 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

14 Oct 2013

Arrival Details

This spyware may be dropped by other malware.

Installation

This spyware drops the following files:

  • %Application Data%\ini.ini

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It drops and executes the following files:

  • %Application Data%\{random 7 letters}.dll

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

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
TcpIpCfg = "Rundll32 "%Application Data%\{random 7 letters}.dll" MainThread"

Other System Modifications

This spyware modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
ProxyEnable = 0

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
ProxyOverride = ""

(Note: The default value data of the said registry entry is <-loopback>;.)

Other Details

This spyware connects to the following URL(s) to check for an Internet connection:

  • http://www.yahoo.com/

It connects to the following possibly malicious URL:

  • http://www.{BLOCKED}tj.info/mail.asp?MAC={MAC Address}&VER={OS Version}
  • http://www.{BLOCKED}001.info/ini.txt
  • http://www.{BLOCKED}ouk.com/1.jpg
  • http://www.{BLOCKED}ouk.com/ini.txt?{random 7 letters}

NOTES:

It deletes the following registry entry:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
ProxyServer = "http=127.0.0.1:8888;https=127.0.0.1:8888;"

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.406.03

FIRST VSAPI PATTERN DATE:

12 Nov 2013

VSAPI OPR PATTERN File:

10.407.00

VSAPI OPR PATTERN Date:

13 Nov 2013

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 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
    • TcpIpCfg = "Rundll32 "%Application Data%\{random 7 letters}.dll" MainThread"

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\Windows\CurrentVersion\Internet Settings
    • From: ProxyEnable = "0"
      To: ProxyEnable = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • From: ProxyOverride = "<local>"
      To: ProxyOverride = "<-loopback>;"

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.
  • %Application Data%\ini.ini
  • %Application Data%\{random 7 letters}.dll

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_AIBATOOK.B. 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 7

Restore this deleted registry key/value 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\Windows\CurrentVersion\Internet Settings
    • ProxyServer = "http=127.0.0.1:8888;https=127.0.0.1:8888;"


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