ALIASES:

PWS:Win32/Fareit (Microsoft); RDN/Spybot.bfr!l (McAfee); Trojan-Spy.Win32.Zbot.sfwb (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Crypt3.NIL (AVG)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware 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: 197,120 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 19 May 2014

Arrival Details

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
viksodr = "rundll32 %Application Data%\viksodr.dll,viksodr"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\WinRAR

HKEY_LOCAL_MACHINE\SOFTWARE\Chcvifhsno

HKEY_CURRENT_USER\SOFTWARE\Chcvifhsno

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\viksodr

It adds the following registry entries:

HKEY_CURRENT_USER\Software\WinRAR
HWID = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
Client Hash = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
2B64F8DB004D21677E188F073F3F280E = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
C62D224035B17E976A16FD3541B9C06C = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
8E96CB59ACF1CBC1F57124983A477B78 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Chcvifhsno
License = "d54f"

HKEY_CURRENT_USER\Software\Chcvifhsno
License = "d54f"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\viksodr
Impersonate = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\viksodr
Asynchronous = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\viksodr
MaxWait = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\viksodr
vimaskfi = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\viksodr
DllName = "%Application Data%\viksodr.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\viksodr
Startup = "viksodr"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Temp%\111796.exe = "%User Temp%\111796.exe:*:Enabled:111796"

Dropping Routine

This spyware drops the following files:

  • %User Temp%\97500.exe
  • %User Temp%\107546.exe
  • %User Temp%\111796.exe
  • %User Temp%\UpdateFlashPlayer_d70cd660.exe
  • %User Temp%\UpdateFlashPlayer_25ef23cb.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.)

Other Details

This spyware connects to the following possibly malicious URL:

  • http://{BLOCKED}hiuwm.com/b/shoe/54607
  • http://{BLOCKED}hiuwm.com/rsmediagallery/jquery
  • http://{BLOCKED}hiuwm.com/rsmediagallery/ajax
  • {BLOCKED}.10.229
  • {BLOCKED}1.164.53
  • {BLOCKED}4.146.11
  • {BLOCKED}.32.32
  • {BLOCKED}.152.248
  • {BLOCKED}.8.30
  • {BLOCKED}.70.143
  • {BLOCKED}.224.195
  • {BLOCKED}.66.240
  • {BLOCKED}255.62
  • {BLOCKED}255.138
  • {BLOCKED}.58.100

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.700

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
    • WinRAR
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • Chcvifhsno
  • In HKEY_CURRENT_USER\SOFTWARE
    • Chcvifhsno
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify
    • viksodr

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
    • viksodr = "rundll32 %Application Data%\viksodr.dll,viksodr"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • HWID = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • Client Hash = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • 2B64F8DB004D21677E188F073F3F280E = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • C62D224035B17E976A16FD3541B9C06C = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • 8E96CB59ACF1CBC1F57124983A477B78 = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Chcvifhsno
    • License = "d54f"
  • In HKEY_CURRENT_USER\Software\Chcvifhsno
    • License = "d54f"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\viksodr
    • Impersonate = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\viksodr
    • Asynchronous = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\viksodr
    • MaxWait = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\viksodr
    • vimaskfi = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\viksodr
    • DllName = "%Application Data%\viksodr.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\viksodr
    • Startup = "viksodr"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Temp%\111796.exe = "%User Temp%\111796.exe:*:Enabled:111796"

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%\97500.exe
  • %User Temp%\107546.exe
  • %User Temp%\111796.exe
  • %User Temp%\UpdateFlashPlayer_d70cd660.exe
  • %User Temp%\UpdateFlashPlayer_25ef23cb.exe

Step 6

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