BKDR_BIFROSE.DQJ

 Analysis by: adel

 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This backdoor has received attention from independent media sources and/or other security firms.

This backdoor opens a hidden Internet Explorer window.

It logs a user's keystrokes to steal information.

  TECHNICAL DETAILS

File Size:

233,508 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

10 Feb 2010

Payload:

Steals information

Installation

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

  • %Windows%\calc.exe

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

It drops the following files:

  • %Windows%\calc - non-malicious file

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

It injects itself into the following processes running in the affected system's memory:

  • EXPLORER.EXE

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • )!VoqA.I4

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
Tibiabot = %Windows%\calc.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{A607F45D-EB17-BE13-3893-3749250B46A6}
StubPath = %Windows%\calc.exe

Backdoor Routine

This backdoor opens a hidden Internet Explorer window.

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}us.no-ip.biz

Information Theft

This backdoor logs a user's keystrokes to steal information.

Stolen Information

The stolen information is saved in the following file:

  • %Windows%\calc

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

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Arrives bundled with an experimental Mozilla Firefox add-on that when installed, executes malicious file.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

6.856.08

FIRST VSAPI PATTERN DATE:

18 Feb 2010

VSAPI OPR PATTERN File:

6.881.00

VSAPI OPR PATTERN Date:

27 Feb 2010

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

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\Microsoft\Active Setup\Installed Components
    • {A607F45D-EB17-BE13-3893-3749250B46A6}

Step 3

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
    • Tibiabot = %Windows%\calc.exe

Step 4

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