TROJ_DROPPR.KZV

January 29, 2013
 ALIASES:

TrojanDownloader:Win32/Xolondox.A (Microsoft); Downloader (Symantec); Trojan-Dropper.Win32.Resdro.b (v) (not malicious) (Sunbelt); Fat-Obfuscated (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan 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:

188,416 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

29 Jan 2013

Arrival Details

This Trojan 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 Trojan drops the following copies of itself into the affected system:

  • %Windows%\Qedie\conime.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

It creates the following folders:

  • %Windows%\Qedie
  • %Windows%\Qedir

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{AENGFU3AA-B933-11d2-9CBD-0000F87A369E}
stubpath = "%Windows%\Qedie\conime.exe"

Other System Modifications

This Trojan deletes the following files:

  • %Program Files%\Internet Explorer\vbaddin.sys

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{AENGFU3AA-B933-11d2-9CBD-0000F87A369E}

HKEY_CURRENT_USER\Software\Enigma Protector\
07640814C7A1EC8A-EB4B5BC3343CC533

HKEY_CURRENT_USER\SOFTWARE\EnigmaDevelopers

HKEY_CURRENT_USER\Software\Enigma Protector\
07640814C7A1EC8A-EB4B5BC3343CC533\7726CF4135C94ECC-768EAD6D4874B8DF

HKEY_USERS\S-1-5-21-1935655697-1844237615-839522115-1003\AppEvents\
Schemes\Apps\Explorer\
Navigating\.Current

HKEY_USERS\S-1-5-21-1935655697-1844237615-839522115-1003\AppEvents\
Schemes\Apps\Explorer\
BlockedPopup\.current

HKEY_USERS\S-1-5-21-1935655697-1844237615-839522115-1003\Control Panel\
Cursors

HKEY_CLASSES_ROOT\CLSID\{DD7D4640-4444-48C0-84FD-21338366D2D4}

HKEY_CLASSES_ROOT\CLSID\{DD7D4640-4444-48C0-84FD-21338366D2D4}\
InProcServer32

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Enigma Protector\
07640814C7A1EC8A-EB4B5BC3343CC533\7726CF4135C94ECC-768EAD6D4874B8DF
BF68AB2B = "{random values}"

HKEY_CURRENT_USER\Software\Enigma Protector\
07640814C7A1EC8A-EB4B5BC3343CC533
Options = "{random values}"

HKEY_CURRENT_USER\Control Panel\Cursors
AppStarting = "%Program Files%\Internet Explorer\tray.cur"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{DD7D4640-4444-48C0-84FD-21338366D2D4}\InProcServer32
ThreadingModel = "Apartment"

It deletes the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Active Setup\Installed Components\{AENGFU3AA-B933-11d2-9CBD-0000F87A369E}

Dropping Routine

This Trojan drops the following files:

  • %Program Files%\933.txt
  • %User Temp%\31028008.gif
  • %Windows%\Qedir\vgsepadn.exe
  • %Windows%\Qedir\edrclcht.exe
  • %Windows%\Qedir\oahagxch.exe
  • %Windows%\Qedir\biaenzyy.exe
  • %Windows%\Qedir\szytotwp.exe
  • %Windows%\Qedir\bxprkvrv.exe
  • %Windows%\Qedir\pehuyynu.exe
  • %Program Files%\Internet Explorer\vbaddin.tdm
  • %Program Files%\Internet Explorer\tray.cur
  • %Windows%\Qedir\_Ms.bat
  • %Program Files%\Internet Explorer\vbaddin.sys

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://127.{BLOCKED}0.{BLOCKED}0.1.jk136.com:123/js/js/top.gif
  • http://127.{BLOCKED}0.{BLOCKED}0.1.jk136.com:123/js/js/1d.exe
  • http://127.{BLOCKED}0.{BLOCKED}0.1.jk136.com:123/js/js/2y.exe
  • http://127.{BLOCKED}0.{BLOCKED}0.1.jk136.com:123/js/js/3t.exe
  • http://127.{BLOCKED}0.{BLOCKED}0.1.jk136.com:123/js/js/4i.exe
  • http://127.{BLOCKED}0.{BLOCKED}0.1.jk136.com:123/js/js/5c.exe
  • http://127.{BLOCKED}0.{BLOCKED}0.1.jk136.com:123/js/js/6h.exe
  • http://127.{BLOCKED}0.{BLOCKED}0.1.jk136.com:123/js/js/7.exe

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {AENGFU3AA-B933-11d2-9CBD-0000F87A369E}
  • In HKEY_CURRENT_USER\Software\Enigma Protector
    • 07640814C7A1EC8A-EB4B5BC3343CC533
  • In HKEY_CURRENT_USER\SOFTWARE
    • EnigmaDevelopers
  • In HKEY_CURRENT_USER\Software\Enigma Protector\07640814C7A1EC8A-EB4B5BC3343CC533
    • 7726CF4135C94ECC-768EAD6D4874B8DF
  • In HKEY_USERS\S-1-5-21-1935655697-1844237615-839522115-1003\AppEvents\Schemes\Apps\Explorer\Navigating
    • .Current
  • In HKEY_USERS\S-1-5-21-1935655697-1844237615-839522115-1003\AppEvents\Schemes\Apps\Explorer\BlockedPopup
    • .current
  • In HKEY_USERS\S-1-5-21-1935655697-1844237615-839522115-1003\Control Panel
    • Cursors
  • In HKEY_CLASSES_ROOT\CLSID
    • {DD7D4640-4444-48C0-84FD-21338366D2D4}
  • In HKEY_CLASSES_ROOT\CLSID\{DD7D4640-4444-48C0-84FD-21338366D2D4}
    • InProcServer32

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\Active Setup\Installed Components\{AENGFU3AA-B933-11d2-9CBD-0000F87A369E}
    • stubpath = "%Windows%\Qedie\conime.exe"
  • In HKEY_CURRENT_USER\Software\Enigma Protector\07640814C7A1EC8A-EB4B5BC3343CC533\7726CF4135C94ECC-768EAD6D4874B8DF
    • BF68AB2B = "{random values}"
  • In HKEY_CURRENT_USER\Software\Enigma Protector\07640814C7A1EC8A-EB4B5BC3343CC533
    • Options = "{random values}"
  • In HKEY_CURRENT_USER\Control Panel\Cursors
    • AppStarting = "%Program Files%\Internet Explorer\tray.cur"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{DD7D4640-4444-48C0-84FD-21338366D2D4}\InProcServer32
    • ThreadingModel = "Apartment"

Step 5

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.
  • %Program Files%\933.txt
  • %User Temp%\31028008.gif
  • %Windows%\Qedir\vgsepadn.exe
  • %Windows%\Qedir\edrclcht.exe
  • %Windows%\Qedir\oahagxch.exe
  • %Windows%\Qedir\biaenzyy.exe
  • %Windows%\Qedir\szytotwp.exe
  • %Windows%\Qedir\bxprkvrv.exe
  • %Windows%\Qedir\pehuyynu.exe
  • %Program Files%\Internet Explorer\vbaddin.tdm
  • %Program Files%\Internet Explorer\tray.cur
  • %Windows%\Qedir\_Ms.bat
  • %Program Files%\Internet Explorer\vbaddin.sys

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.
  • %Windows%\Qedie
  • %Windows%\Qedir

Step 7

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

  • %Program Files%\Internet Explorer\vbaddin.sys

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\Active Setup\Installed Components
    • {AENGFU3AA-B933-11d2-9CBD-0000F87A369E}


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