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TROJ_DRPPR.KLV

September 06, 2013
 ALIASES:

TrojanDropper:Win32/Jadtre.C (Microsoft); Trojan.Dropper (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Dropper.Generic8.BDEP (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:

6,474,915 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Sep 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 creates the following folders:

  • %User Temp%\imageformats
  • %User Temp%\tmpIL8_

(Note: %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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
[EXPL0RER] = "%Program Files%\feiyue.exe"

Other System Modifications

This Trojan modifies the following file(s):

  • %Windows%\Prefetch\NTOSBOOT-B00DFAAD.pf
  • %Windows%\Prefetch\CMD.EXE-087B4001.pf
  • %Windows%\Prefetch\WUAUCLT.EXE-399A8E72.pf

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

It deletes the following files:

  • %User Temp%\969616640.exe
  • 5BF40624.tmp
  • %User Temp%\ICEP~1.EXE
  • \?\C:\DOCUME~1\Wilbert\LOCALS~1\Temp\LoLSkins.old
  • %User Temp%\969616~1.EXE
  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log

(Note: %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.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Trolltech\
OrganizationDefaults

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Trolltech\
OrganizationDefaults\Qt Plugin Cache 4.8.false\C:\
DOCUME~1\Wilbert\LOCALS~1\
Temp\imageformats
qico4.dll = "40704,0,Windows msvc release full-config,2013-05-03T01:49:18"

HKEY_CURRENT_USER\Software\Trolltech\
OrganizationDefaults\Qt Factory Cache 4.8\com.trolltech.Qt.QImageIOHandlerFactoryInterface:\
C:\DOCUME~1\Wilbert\
LOCALS~1\Temp\imageformats
qico4.dll = "2013-05-03T01:49:18,ico"

HKEY_CURRENT_USER\Software\Trolltech\
OrganizationDefaults\Qt Plugin Cache 4.8.false\C:\
DOCUME~1\Wilbert\LOCALS~1\
Temp\imageformats
qjpeg4.dll = "40802,0,Windows msvc release full-config,2013-05-03T01:49:18"

HKEY_CURRENT_USER\Software\Trolltech\
OrganizationDefaults\Qt Factory Cache 4.8\com.trolltech.Qt.QImageIOHandlerFactoryInterface:\
C:\DOCUME~1\Wilbert\
LOCALS~1\Temp\imageformats
qjpeg4.dll = "2013-05-03T01:49:18,jpeg,jpg"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\config.ini
  • %User Temp%\ice.p.exe
  • %User Temp%\jerry.exe
  • %User Temp%\LoLSkins.exe
  • %User Temp%\????.exe
  • %User Temp%\imageformats\qico4.dll
  • %User Temp%\imageformats\qjpeg4.dll
  • %User Temp%\QtCore4.dll
  • %User Temp%\QtGui4.dll
  • %Windows%\KB2536276666.log
  • %System Root%\wy.exe
  • %System%\aw98fd4f41110
  • %System Root%\delus.bat
  • LoLSkins.new
  • %Temp%\56d34938.exe
  • %Windows%\Prefetch\DRWTSN32.EXE-2B4B52AC.pf
  • %Windows%\Prefetch\????.EXE-3ADBA78D.pf
  • %Windows%\Prefetch\56D34938.EXE-37A805D6.pf
  • %Windows%\Prefetch\SERVICE.EXE-0366F94F.pf
  • %Temp%\deleteme.bat
  • %User Temp%\TextLog.dat
  • %Program Files%\feiyue.exe
  • %User Temp%\tmpIL8_\service.exe

(Note: %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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.. %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).)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}u.sh/3ES64.exe
  • http://www.{BLOCKED}ns.netupdate.php
  • http://www.{BLOCKED}u.com
  • http://www.{BLOCKED}e.com/tel/ice.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_CURRENT_USER\Software\Trolltech
    • OrganizationDefaults

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
    • [EXPL0RER] = "%Program Files%\feiyue.exe"
  • In HKEY_CURRENT_USER\Software\Trolltech\OrganizationDefaults\Qt Plugin Cache 4.8.false\C:\DOCUME~1\Wilbert\LOCALS~1\Temp\imageformats
    • qico4.dll = "40704,0,Windows msvc release full-config,2013-05-03T01:49:18"
  • In HKEY_CURRENT_USER\Software\Trolltech\OrganizationDefaults\Qt Factory Cache 4.8\com.trolltech.Qt.QImageIOHandlerFactoryInterface:\C:\DOCUME~1\Wilbert\LOCALS~1\Temp\imageformats
    • qico4.dll = "2013-05-03T01:49:18,ico"
  • In HKEY_CURRENT_USER\Software\Trolltech\OrganizationDefaults\Qt Plugin Cache 4.8.false\C:\DOCUME~1\Wilbert\LOCALS~1\Temp\imageformats
    • qjpeg4.dll = "40802,0,Windows msvc release full-config,2013-05-03T01:49:18"
  • In HKEY_CURRENT_USER\Software\Trolltech\OrganizationDefaults\Qt Factory Cache 4.8\com.trolltech.Qt.QImageIOHandlerFactoryInterface:\C:\DOCUME~1\Wilbert\LOCALS~1\Temp\imageformats
    • qjpeg4.dll = "2013-05-03T01:49:18,jpeg,jpg"

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.
  • %User Temp%\config.ini
  • %User Temp%\ice.p.exe
  • %User Temp%\jerry.exe
  • %User Temp%\LoLSkins.exe
  • %User Temp%\????.exe
  • %User Temp%\imageformats\qico4.dll
  • %User Temp%\imageformats\qjpeg4.dll
  • %User Temp%\QtCore4.dll
  • %User Temp%\QtGui4.dll
  • %Windows%\KB2536276666.log
  • %System Root%\wy.exe
  • %System%\aw98fd4f41110
  • %System Root%\delus.bat
  • LoLSkins.new
  • %Temp%\56d34938.exe
  • %Windows%\Prefetch\DRWTSN32.EXE-2B4B52AC.pf
  • %Windows%\Prefetch\????.EXE-3ADBA78D.pf
  • %Windows%\Prefetch\56D34938.EXE-37A805D6.pf
  • %Windows%\Prefetch\SERVICE.EXE-0366F94F.pf
  • %Temp%\deleteme.bat
  • %User Temp%\TextLog.dat
  • %Program Files%\feiyue.exe
  • %User Temp%\tmpIL8_\service.exe

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 Temp%\imageformats
  • %User Temp%\tmpIL8_

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DRPPR.KLV. 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 deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %Windows%\Prefetch\NTOSBOOT-B00DFAAD.pf
    • %Windows%\Prefetch\CMD.EXE-087B4001.pf
    • %Windows%\Prefetch\WUAUCLT.EXE-399A8E72.pf

Step 9

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.

  • %User Temp%\969616640.exe
  • 5BF40624.tmp
  • %User Temp%\ICEP~1.EXE
  • \?\C:\DOCUME~1\Wilbert\LOCALS~1\Temp\LoLSkins.old
  • %User Temp%\969616~1.EXE
  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log


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