PE_VIRUT.XU

August 08, 2013
 ALIASES:

Virus:Win32/Virut.U (Microsoft); PWS-Banker (McAfee); W32.Virut.W (Symantec); Virus.Win32.Virut.u (Kaspersky); Virus.Win32.Virut.t (v) (Sunbelt); Win32.Virtob.6.Gen (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This file infector 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:

300,032 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 Oct 2011

Arrival Details

This file infector 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 file infector creates the following folders:

  • %Program Files%\common files\okprivacy
  • %Start Menu%\Programs\¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã

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

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
okprivacy = "%System Root%\okprivacy.exe"

Other System Modifications

This file infector deletes the following files:

  • %Windows%\fonts\msgothic.ttf
  • %Windows%\fonts\msuigoth.ttf
  • %Windows%\fonts\MSMINCHO.TTF
  • %Windows%\fonts\Gulim.ttf
  • %Windows%\fonts\Gulimche.ttf
  • %Windows%\fonts\Dotum.ttf
  • %Windows%\fonts\Batang.ttf
  • %Windows%\fonts\Gungsuh.ttf
  • %Windows%\fonts\Simsun.ttf
  • %Windows%\fonts\nsimsun.ttf
  • %Windows%\fonts\MingLiU.ttf
  • %Windows%\fonts\pmingliu.ttf
  • %System%\SET2.tmp
  • %System%\kbd101b.dll
  • %System%\SET1.tmp
  • %System%\SET4.tmp
  • %System%\kbd101c.dll
  • %System%\SET3.tmp
  • %System%\SET6.tmp
  • %System%\kbd103.dll
  • %System%\SET5.tmp
  • %System%\SET8.tmp
  • %System%\kbd106.dll
  • %System%\SET7.tmp
  • %System%\SETA.tmp
  • %System%\kbdjpn.dll
  • %System%\SET9.tmp
  • %System%\SETC.tmp
  • %System%\kbdkor.dll
  • %System%\SETB.tmp

(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\okprivacy

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
AppPath = "%System Root%\"

HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
okphk.dll = "0.1"

HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
okpuninst.exe = "0.11"

HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
okpwcher.exe = "0.111"

HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
okppopd.dll = "0.1"

HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
okprivacy.exe = "0.326"

HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
apppath = "%System Root%\"

HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
InstDate = "10/5/2011"

HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
BootDate = "10/5/2011"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
UninstallString = "%Program Files%\common files\okprivacy\okpuninst.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
DisplayName = "¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
Publisher = "¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
HelpLink = "http://www.{BLOCKED}acy.co.kr"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
DisplayVersion = "1.0"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Enable = 1

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Size = a

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
InitHits = 64

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Factor = 14

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = 1

Dropping Routine

This file infector drops the following files:

  • %System Root%\okphk.dll
  • %Program Files%\common files\okprivacy\okpuninst.exe
  • %System Root%\okpwcher.exe
  • %System Root%\okppopd.dll
  • %System Root%\okprivacy.exe
  • %System Root%\okai.ini
  • %System Root%\okli.ini
  • %System Root%\oksc.dat
  • %Desktop%\OKÇÁ¶óÀ̹ö½Ã.lnk
  • %Start Menu%\Programs\¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã\OKÇÁ¶óÀ̹ö½Ã.lnk
  • %System%\SET1.tmp
  • %System%\SET3.tmp
  • %System%\SET5.tmp
  • %System%\SET7.tmp
  • %System%\SET9.tmp
  • %System%\SETB.tmp
  • %System%\SET2.tmp
  • %System%\SET4.tmp
  • %System%\SET6.tmp
  • %System%\SET8.tmp
  • %System%\SETA.tmp
  • %System%\SETC.tmp

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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).. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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
    • okprivacy
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • ¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • CpMRU

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
    • okprivacy="%System Root%\okprivacy.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
    • AppPath="%System Root%\"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
    • okphk.dll="0.1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
    • okpuninst.exe="0.11"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
    • okpwcher.exe="0.111"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
    • okppopd.dll="0.1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
    • okprivacy.exe="0.326"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
    • apppath="%System Root%\"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
    • InstDate="10/5/2011"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\okprivacy
    • BootDate="10/5/2011"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
    • UninstallString="%Program Files%\common files\okprivacy\okpuninst.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
    • DisplayName="¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
    • Publisher="¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
    • HelpLink="http://www.{BLOCKED}acy.co.kr"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã
    • DisplayVersion="1.0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Enable=1
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Size=a
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • InitHits=64
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Factor=14
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • W2KLpk=1

Step 5

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.
  • %Program Files%\common files\okprivacy
  • %Start Menu%\Programs\¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã

Step 6

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.
  • %System Root%\okphk.dll
  • %Program Files%\common files\okprivacy\okpuninst.exe
  • %System Root%\okpwcher.exe
  • %System Root%\okppopd.dll
  • %System Root%\okprivacy.exe
  • %System Root%\okai.ini
  • %System Root%\okli.ini
  • %System Root%\oksc.dat
  • %Desktop%\OKÇÁ¶óÀ̹ö½Ã.lnk
  • %Start Menu%\Programs\¿ÀÄÉÀÌÇÁ¶óÀ̹ö½Ã\OKÇÁ¶óÀ̹ö½Ã.lnk
  • %System%\SET1.tmp
  • %System%\SET3.tmp
  • %System%\SET5.tmp
  • %System%\SET7.tmp
  • %System%\SET9.tmp
  • %System%\SETB.tmp
  • %System%\SET2.tmp
  • %System%\SET4.tmp
  • %System%\SET6.tmp
  • %System%\SET8.tmp
  • %System%\SETA.tmp
  • %System%\SETC.tmp

Step 7

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


Did this description help? Tell us how we did.