ALIASES:

TrojanDownloader:Win32/Wintrim.BX (Microsoft); Adware.Lop (Symantec); Packed.Win32.Hrup.b (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Adware:W32/Wintrim.gen!P (FSecure)

 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: 1,614,496 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 21 Sep 2012

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:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsh3.tmp
  • %Program Files%\Original-Solitaire
  • %Program Files%\Original-Solitaire\data
  • %Start Menu%\Programs\Original-Solitaire

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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.. %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 Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
bobivcp = "%Application Data%\bobivcp.exe bobivcp"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
dzpfesi = "%Application Data%\dzpfesi.exe dzpfesi"

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsr1.tmp
  • %User Temp%\nsh3.tmp
  • %Application Data%\bobivcp_navtmp.dat

(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.. %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 adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\OriginalSolitaire

HKEY_CURRENT_USER\Software\OriginalSolitaire

HKEY_CURRENT_USER\Software\fcn

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
bobivcp

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
dzpfesi

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_lg = "3Den"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_lg = "3Den"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
grpid = "3D3508"

HKEY_CURRENT_USER\Software\OriginalSolitaire
grpid = "3D3508"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
installdt = "20110415"

HKEY_CURRENT_USER\Software\OriginalSolitaire
installdt = "20110415"

HKEY_CURRENT_USER\Software\OriginalSolitaire
uai = "http://www.{BLOCKED}al-solitaire.com/congratulation.php?lg=3Den&grpid=3D3508&tag_id=3D158"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_browser = "IE"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_browser = "IE"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_hp_url = "http://www.{BLOCKED}-solver.com/?t=Q1104153D3508&s=h"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_hp_url = "http://www.{BLOCKED}-solver.com/?t=Q1104153D3508&s=h"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_se_name = "Search Solver"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_se_name = "Search Solver"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_se_url = "{random characters}"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_se_url = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_se_icon = "http://www.{BLOCKED}-solver.com/favicon.ico"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_se_icon = "http://www.{BLOCKED}-solver.com/favicon.ico"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
ss_res = "http://download.{BLOCKED}al-solitaire.com/ss.php?lg=3Den&grpid=3D3508&tag_id=3D158"

HKEY_CURRENT_USER\Software\OriginalSolitaire
ss_res = "http://download.{BLOCKED}al-solitaire.com/ss.php?lg=3Den&grpid=3D3508&tag_id=3D158"

HKEY_CURRENT_USER\Software\OriginalSolitaire
_status = "ok"

HKEY_CURRENT_USER\Software\OriginalSolitaire
uai = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
sp_id = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
ApplicationVersionInstall = "1001"

HKEY_CURRENT_USER\Software\OriginalSolitaire
ApplicationVersionInstall = "1001"

HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
dl_lg = "EN"

HKEY_CURRENT_USER\Software\OriginalSolitaire
dl_lg = "EN"

HKEY_CURRENT_USER\Software\fcn
gid = "3"

HKEY_CURRENT_USER\Software\fcn
cnid = "m9kPlOrDT=OKl=ySoT77nw"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
bobivcp
DisplayName = "Favorit"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
bobivcp
UninstallString = "%Application Data%\bobivcp.exe -uninstall"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
bobivcp
NoRemove = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
bobivcp
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
bobivcp
NoRepair = "1"

HKEY_CURRENT_USER\Software\fcn
idt = "201209211126"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
dzpfesi
DisplayName = "Favorit"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
dzpfesi
UninstallString = "%Application Data%\dzpfesi.exe -uninstall"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
dzpfesi
NoRemove = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
dzpfesi
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
dzpfesi
NoRepair = "1"

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
bobivcp

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsr2.tmp
  • %User Temp%\nsh3.tmp\modern-header.bmp
  • %User Temp%\nsh3.tmp\modern-wizard.bmp
  • %User Temp%\nsh3.tmp\nsDialogs.dll
  • %User Temp%\nsh3.tmp\System.dll
  • %User Temp%\nsh3.tmp\header_OS.bmp
  • %User Temp%\nsh3.tmp\FavoritDE.rtf
  • %User Temp%\nsh3.tmp\FavoritEN.rtf
  • %User Temp%\nsh3.tmp\FavoritES.rtf
  • %User Temp%\nsh3.tmp\FavoritFR.rtf
  • %User Temp%\nsh3.tmp\FavoritIT.rtf
  • %Application Data%\bobivcp.exe
  • %Program Files%\Original-Solitaire\data\translation_file_original_solitaire.xml
  • %Start Menu%\Programs\Original-Solitaire\Original-Solitaire.lnk
  • %Start Menu%\Programs\Original-Solitaire\Uninstall.lnk
  • %Desktop%\Original-Solitaire.lnk
  • %User Temp%\nsh3.tmp\NSISdl.dll
  • %User Temp%\Original-Solitaire_exe.dat
  • %Application Data%\bobivcp.dat
  • %Application Data%\bobivcp_navps.dat
  • %Application Data%\bobivcp_m2s.xml
  • %Application Data%\bobivcp_m2s.zl
  • %Application Data%\bobivcp_s2m.zl
  • %Application Data%\bobivcp_s2m.xml
  • %Application Data%\dzpfesi.exe
  • %Application Data%\bobivcp_navup.dat
  • %Application Data%\dzpfesi.dat
  • %Application Data%\dzpfesi_navps.dat
  • %Application Data%\dzpfesi_nav.dat
  • %Application Data%\dzpfesi_navup.dat

(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.. %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.. %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.. %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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://download.{BLOCKED}t-network.com/binaries/download.php
  • http://updates.{BLOCKED}-network.com/sa/cpi.php?{random characters}
  • http://updates.{BLOCKED}-network.com/sa/receive_data.php
  • http://updates.{BLOCKED}-network.com/binaries/bin.php?id=0&up=1&fd=1
  • http://updates.{BLOCKED}-network.com/cn/cnconfig.php?vs=&country=&did=&grp=3&pid=
  • http://updates.{BLOCKED}-network.com/binaries/check.php

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.200

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

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
    • OriginalSolitaire
  • In HKEY_CURRENT_USER\Software
    • OriginalSolitaire
  • In HKEY_CURRENT_USER\Software
    • fcn
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • bobivcp
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • dzpfesi

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • bobivcp = "%Application Data%\bobivcp.exe bobivcp"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • dzpfesi = "%Application Data%\dzpfesi.exe dzpfesi"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_lg = "3Den"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_lg = "3Den"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • grpid = "3D3508"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • grpid = "3D3508"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • installdt = "20110415"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • installdt = "20110415"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • uai = "http://www.{BLOCKED}al-solitaire.com/congratulation.php?lg=3Den&grpid=3D3508&tag_id=3D158"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_browser = "IE"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_browser = "IE"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_hp_url = "http://www.{BLOCKED}-solver.com/?t=Q1104153D3508&s=h"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_hp_url = "http://www.{BLOCKED}-solver.com/?t=Q1104153D3508&s=h"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_se_name = "Search Solver"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_se_name = "Search Solver"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_se_url = "{random characters}"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_se_url = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_se_icon = "http://www.{BLOCKED}-solver.com/favicon.ico"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_se_icon = "http://www.{BLOCKED}-solver.com/favicon.ico"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • ss_res = "http://download.{BLOCKED}al-solitaire.com/ss.php?lg=3Den&grpid=3D3508&tag_id=3D158"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • ss_res = "http://download.{BLOCKED}al-solitaire.com/ss.php?lg=3Den&grpid=3D3508&tag_id=3D158"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • _status = "ok"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • uai = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • sp_id = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • ApplicationVersionInstall = "1001"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • ApplicationVersionInstall = "1001"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\OriginalSolitaire
    • dl_lg = "EN"
  • In HKEY_CURRENT_USER\Software\OriginalSolitaire
    • dl_lg = "EN"
  • In HKEY_CURRENT_USER\Software\fcn
    • gid = "3"
  • In HKEY_CURRENT_USER\Software\fcn
    • cnid = "m9kPlOrDT=OKl=ySoT77nw"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\bobivcp
    • DisplayName = "Favorit"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\bobivcp
    • UninstallString = "%Application Data%\bobivcp.exe -uninstall"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\bobivcp
    • NoRemove = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\bobivcp
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\bobivcp
    • NoRepair = "1"
  • In HKEY_CURRENT_USER\Software\fcn
    • idt = "201209211126"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\dzpfesi
    • DisplayName = "Favorit"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\dzpfesi
    • UninstallString = "%Application Data%\dzpfesi.exe -uninstall"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\dzpfesi
    • NoRemove = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\dzpfesi
    • NoModify = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\dzpfesi
    • NoRepair = "1"

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%\nsr2.tmp
  • %User Temp%\nsh3.tmp\modern-header.bmp
  • %User Temp%\nsh3.tmp\modern-wizard.bmp
  • %User Temp%\nsh3.tmp\nsDialogs.dll
  • %User Temp%\nsh3.tmp\System.dll
  • %User Temp%\nsh3.tmp\header_OS.bmp
  • %User Temp%\nsh3.tmp\FavoritDE.rtf
  • %User Temp%\nsh3.tmp\FavoritEN.rtf
  • %User Temp%\nsh3.tmp\FavoritES.rtf
  • %User Temp%\nsh3.tmp\FavoritFR.rtf
  • %User Temp%\nsh3.tmp\FavoritIT.rtf
  • %Application Data%\bobivcp.exe
  • %Program Files%\Original-Solitaire\data\translation_file_original_solitaire.xml
  • %Start Menu%\Programs\Original-Solitaire\Original-Solitaire.lnk
  • %Start Menu%\Programs\Original-Solitaire\Uninstall.lnk
  • %Desktop%\Original-Solitaire.lnk
  • %User Temp%\nsh3.tmp\NSISdl.dll
  • %User Temp%\Original-Solitaire_exe.dat
  • %Application Data%\bobivcp.dat
  • %Application Data%\bobivcp_navps.dat
  • %Application Data%\bobivcp_m2s.xml
  • %Application Data%\bobivcp_m2s.zl
  • %Application Data%\bobivcp_s2m.zl
  • %Application Data%\bobivcp_s2m.xml
  • %Application Data%\dzpfesi.exe
  • %Application Data%\bobivcp_navup.dat
  • %Application Data%\dzpfesi.dat
  • %Application Data%\dzpfesi_navps.dat
  • %Application Data%\dzpfesi_nav.dat
  • %Application Data%\dzpfesi_navup.dat

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.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsh3.tmp
  • %Program Files%\Original-Solitaire
  • %Program Files%\Original-Solitaire\data
  • %Start Menu%\Programs\Original-Solitaire

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAM_0000b59.TOMA. 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.

  • %User Temp%\nsr1.tmp
  • %User Temp%\nsh3.tmp
  • %Application Data%\bobivcp_navtmp.dat

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • bobivcp


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