BKDR_BIFROSE.JCS


 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:

968,192 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Dec 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%\Gametalk.exe

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

It creates the following folders:

  • %Windows%\baram1124_68AD0FD0
  • %Windows%\baram1124_68AD0FD0\ServerLogs
  • %Windows%\baram1124_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
gametalk = "%Windows%\Gametalk.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%\Gametalk.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\gametalk

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo

It adds the following registry entries:

HKEY_CURRENT_USER\Software\gametalk
Grup = "apocalypse"

HKEY_CURRENT_USER\Software\gametalk
Ad = "baram1124"

HKEY_CURRENT_USER\Software\gametalk
Sifre = "ap0calypse"

HKEY_CURRENT_USER\Software\gametalk
Delay = "10000"

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

HKEY_CURRENT_USER\Software\gametalk
MsgGoster = "0"

HKEY_CURRENT_USER\Software\gametalk
Buton = "0"

HKEY_CURRENT_USER\Software\gametalk
Icon = "0"

HKEY_CURRENT_USER\Software\gametalk
Bindir = "0"

HKEY_CURRENT_USER\Software\gametalk
Mutex = "gametalk"

HKEY_CURRENT_USER\Software\gametalk
Baslangic = "1"

HKEY_CURRENT_USER\Software\gametalk
Anahtar = "gametalk"

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

HKEY_CURRENT_USER\Software\gametalk
ProgramAdi = "Gametalk.exe"

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

HKEY_CURRENT_USER\Software\gametalk
Injecsiyon = "1"

HKEY_CURRENT_USER\Software\gametalk
Persistent = "1"

HKEY_CURRENT_USER\Software\gametalk
UserMode = "1"

HKEY_CURRENT_USER\Software\gametalk
KernelMode = "1"

HKEY_CURRENT_USER\Software\gametalk
SafeMode = "1"

HKEY_CURRENT_USER\Software\gametalk
Offline = "1"

HKEY_CURRENT_USER\Software\gametalk
Melt = "0"

HKEY_CURRENT_USER\Software\gametalk
OlderDate = "1"

HKEY_CURRENT_USER\Software\gametalk
DisableSafeMode = "1"

HKEY_CURRENT_USER\Software\gametalk
Hidden = "1"

HKEY_CURRENT_USER\Software\gametalk
System = "1"

HKEY_CURRENT_USER\Software\gametalk
Archive = "1"

Dropping Routine

This backdoor drops the following files:

  • htm.htm
  • %Windows%\Gametalk.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.JCS 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
    • gametalk
  • 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
    • gametalk = "%Windows%\Gametalk.exe"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Grup = "apocalypse"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Ad = "baram1124"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Sifre = "ap0calypse"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Delay = "10000"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Baglantilar = "winblog.codns.com:329;"
  • In HKEY_CURRENT_USER\Software\gametalk
    • MsgGoster = "0"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Buton = "0"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Icon = "0"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Bindir = "0"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Mutex = "gametalk"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Baslangic = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Anahtar = "gametalk"
  • In HKEY_CURRENT_USER\Software\gametalk
    • YuklenenDizin = "%Windows%"
  • In HKEY_CURRENT_USER\Software\gametalk
    • ProgramAdi = "Gametalk.exe"
  • In HKEY_CURRENT_USER\Software\gametalk
    • ActiveX = "{DP4E1576-3A8V-7451-02D0-6YWPX5HU2V83}"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Injecsiyon = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Persistent = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • UserMode = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • KernelMode = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • SafeMode = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Offline = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Melt = "0"
  • In HKEY_CURRENT_USER\Software\gametalk
    • OlderDate = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • DisableSafeMode = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • Hidden = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • System = "1"
  • In HKEY_CURRENT_USER\Software\gametalk
    • 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%\Gametalk.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%\Gametalk.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%\baram1124_68AD0FD0
  • %Windows%\baram1124_68AD0FD0\ServerLogs
  • %Windows%\baram1124_68AD0FD0\ServerLogs\Wilbert

Step 8

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