PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor 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: 676,352 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 07 Sep 2013

Arrival Details

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

  • %Windows%\V3protect.exe

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

It creates the following folders:

  • %Windows%\winblog0702_68AD0FD0
  • %Windows%\winblog0702_68AD0FD0\ServerLogs
  • %Windows%\winblog0702_68AD0FD0\ServerLogs\Wilbert

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

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
V3protect = "%Windows%\V3protect.exe"

It modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
UserInit = "%System%\userinit.exe,%Windows%\V3protect.exe"

(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\V3protect

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo

It adds the following registry entries:

HKEY_CURRENT_USER\Software\V3protect
Grup = "apocalypse"

HKEY_CURRENT_USER\Software\V3protect
Ad = "winblog0702"

HKEY_CURRENT_USER\Software\V3protect
Sifre = "ap0calypse"

HKEY_CURRENT_USER\Software\V3protect
Delay = "10000"

HKEY_CURRENT_USER\Software\V3protect
Baglantilar = "winblog.codns.com:329;"

HKEY_CURRENT_USER\Software\V3protect
MsgGoster = "0"

HKEY_CURRENT_USER\Software\V3protect
Buton = "0"

HKEY_CURRENT_USER\Software\V3protect
Icon = "0"

HKEY_CURRENT_USER\Software\V3protect
Bindir = "0"

HKEY_CURRENT_USER\Software\V3protect
Mutex = "V3protect"

HKEY_CURRENT_USER\Software\V3protect
Baslangic = "1"

HKEY_CURRENT_USER\Software\V3protect
Anahtar = "V3protect"

HKEY_CURRENT_USER\Software\V3protect
YuklenenDizin = "%Windows%"

HKEY_CURRENT_USER\Software\V3protect
ProgramAdi = "V3protect.exe"

HKEY_CURRENT_USER\Software\V3protect
ActiveX = "{DP4E1576-3A8V-7451-02D0-6YWPX5HU2V83}"

HKEY_CURRENT_USER\Software\V3protect
Injecsiyon = "1"

HKEY_CURRENT_USER\Software\V3protect
Persistent = "1"

HKEY_CURRENT_USER\Software\V3protect
UserMode = "1"

HKEY_CURRENT_USER\Software\V3protect
KernelMode = "1"

HKEY_CURRENT_USER\Software\V3protect
SafeMode = "1"

HKEY_CURRENT_USER\Software\V3protect
Offline = "1"

HKEY_CURRENT_USER\Software\V3protect
Melt = "0"

HKEY_CURRENT_USER\Software\V3protect
OlderDate = "1"

HKEY_CURRENT_USER\Software\V3protect
DisableSafeMode = "1"

HKEY_CURRENT_USER\Software\V3protect
Hidden = "1"

HKEY_CURRENT_USER\Software\V3protect
System = "1"

HKEY_CURRENT_USER\Software\V3protect
Archive = "1"

Dropping Routine

This backdoor drops the following files:

  • htm.htm
  • %Windows%\V3protect.exe

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

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

Identify and delete files detected as BKDR_BIFROSE.GDF using either the Startup Disk or Recovery Console

[ 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
    • V3protect
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
    • msvideo

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
    • V3protect = "%Windows%\V3protect.exe"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Grup = "apocalypse"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Ad = "winblog0702"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Sifre = "ap0calypse"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Delay = "10000"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Baglantilar = "winblog.codns.com:329;"
  • In HKEY_CURRENT_USER\Software\V3protect
    • MsgGoster = "0"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Buton = "0"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Icon = "0"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Bindir = "0"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Mutex = "V3protect"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Baslangic = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Anahtar = "V3protect"
  • In HKEY_CURRENT_USER\Software\V3protect
    • YuklenenDizin = "%Windows%"
  • In HKEY_CURRENT_USER\Software\V3protect
    • ProgramAdi = "V3protect.exe"
  • In HKEY_CURRENT_USER\Software\V3protect
    • ActiveX = "{DP4E1576-3A8V-7451-02D0-6YWPX5HU2V83}"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Injecsiyon = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Persistent = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • UserMode = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • KernelMode = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • SafeMode = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Offline = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Melt = "0"
  • In HKEY_CURRENT_USER\Software\V3protect
    • OlderDate = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • DisableSafeMode = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Hidden = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • System = "1"
  • In HKEY_CURRENT_USER\Software\V3protect
    • Archive = "1"

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: UserInit = "%System%\userinit.exe,%Windows%\V3protect.exe"
      To: UserInit = ""%Windows%\system32\userinit.exe,""

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.
  • htm.htm
  • %Windows%\V3protect.exe

Step 7

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%\winblog0702_68AD0FD0
  • %Windows%\winblog0702_68AD0FD0\ServerLogs
  • %Windows%\winblog0702_68AD0FD0\ServerLogs\Wilbert

Step 8

Scan your computer with your Trend Micro product to delete files detected as BKDR_BIFROSE.GDF. 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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