Threat Encyclopedia

TSPY_AMBLER.KA

Publish date: October 09, 2012

ANALYSIS BY

Karl Dominguez


PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type:Spyware

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW


This spyware steals user information such as login credentials and passwords.

This spyware may be dropped by other malware.

TECHNICAL DETAILS

File Size:

42,496 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

29 Nov 2010

Arrival Details

This spyware may be dropped by the following malware:

  • TROJ_AMBLER.KA

Installation

This spyware drops the following component file(s):

  • %User Profile%\Application Data\Sun\cetw.txt
  • %User Profile%\Application Data\Sun\lfmt.txt
  • %User Profile%\Application Data\Sun\{malware file name}_shrd
  • %User Profile%\Application Data\Sun\rwbbr.txt
  • %User Profile%\Application Data\Sun\oietr.txt
  • %User Profile%\Application Data\Sun\cngrh.txt
  • %User Profile%\Application Data\Sun\vntw.txt
  • %User Profile%\Application Data\Sun\mogr.txt
  • %User Profile%\Application Data\Sun\cetw.txt
  • %User Profile%\Application Data\Sun\mxd1.txt
  • %User Profile%\Application Data\Sun\vwvn.txt
  • %User Profile%\Application Data\Sun\crff.txt
  • %User Profile%\Application Data\Sun\xkelf.txt
  • %User Profile%\Application Data\Sun\opfwe.txt
  • %User Profile%\Application Data\Sun\lofwfg.txt
  • %User Profile%\Application Data\Sun\ffefx.txt

(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.)

It creates the following folders:

  • %User Profile%\Application Data\Sun

(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.)

It injects codes into the following process(es):

  • Iexplore.exe
  • firefox.exe

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{24EA4F28-B636-43C1-BCE6-F287B56E42D2}
StubPath = "rundll32.exe %User Profile%\Application Data\Sun\{malware file name}.dll", UnregisterDll"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Clock

HKEY_CURRENT_USER\Software\Microsoft\
Clock\0

HKEY_CURRENT_USER\Software\Microsoft\
Clock\7

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{24EA4F28-B636-43C1-BCE6-F287B56E42D2}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\PhishingFilter
Enabled = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\PhishingFilter
EnabledV8 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\PhishingFilter
ShownVerifyBalloon = "3"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
TabProcGrowth = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
NoProtectedModeBanner = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Security
DisableFixSecuritySettings = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Security
DisableSecuritySettingsCheck = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{24EA4F28-B636-43C1-BCE6-F287B56E42D2}
(default) = "Transaction Manager"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{24EA4F28-B636-43C1-BCE6-F287B56E42D2}
Locale = "EN"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{24EA4F28-B636-43C1-BCE6-F287B56E42D2}
Locale = "EN"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{24EA4F28-B636-43C1-BCE6-F287B56E42D2}
StubPath = "rundll32.exe %User Profile%\Application Data\Sun\{malware file name}.dll", UnregisterDll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{24EA4F28-B636-43C1-BCE6-F287B56E42D2}
IsInstalled = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{24EA4F28-B636-43C1-BCE6-F287B56E42D2}
Version = "4,3,6,3"

HKEY_CURRENT_USER\Software\Microsoft\
Clock\0
knhbc = "22052011_003114_2507687"

Stolen Information

This spyware sends the gathered information via HTTP POST to the following URL:

  • http://{BLOCKED}boook.com/myu.php
  • http://{BLOCKED}boook.com/myc.php
  • http://{BLOCKED}boook.com/myi.php
  • http://{BLOCKED}boook.com/myn.php
  • http://{BLOCKED}boook.com/myl.php

NOTES:

It may create/modify the following registry entries:

(Note: The default values are user-defined.)

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\1
1400 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\1
1200 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\1
1405 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\1
2500 = "3"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\1
1809 = "3"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\2
1400 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\2
1200 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\2
1405 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\2
2500 = "3"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\2
1809 = "3"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\3
1400 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\3
1200 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\3
1405 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\3
2500 = "3"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\3
1809 = "3"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\4
1400 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\4
1200 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\4
1405 = "0"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\4
2500 = "3"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Internet Settings\Zones\4
1809 = "3"

It steals the following information:

  • Passwords stored in pstorec.dll
  • Internet Explorer Password-protected sites
  • MSN Explorer login credentials
  • Internet Explorer auto-complete fields
  • Internet Explorer auto-complete passwords
  • Microsoft Outlook Express user credentials
  • Bank of America user credentials
  • Internet cookies
  • Certificates

It also has the following capabilities:

  • Keylog
  • Delete itself
  • Delete cookies
  • Shutdown system
  • Enumerate drives

SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.726.08

FIRST VSAPI PATTERN DATE:

26 Dec 2010

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

Remove malware files dropped/downloaded by TSPY_AMBLER.KA

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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
    • Clock
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {24EA4F28-B636-43C1-BCE6-F287B56E42D2}

Step 5

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\PhishingFilter
    • Enabled = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\PhishingFilter
    • EnabledV8 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\PhishingFilter
    • ShownVerifyBalloon = "3"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • TabProcGrowth = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • NoProtectedModeBanner = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Security
    • DisableFixSecuritySettings = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Security
    • DisableSecuritySettingsCheck = "1"

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\Sun

Step 7

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