BKDR_BIFROSE.DQJ
Windows 98, ME, NT, 2000, XP, Server 2003
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
233,508 bytes
PE
Yes
10 Feb 2010
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
8.900
6.856.08
18 Feb 2010
6.881.00
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
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}
- {A607F45D-EB17-BE13-3893-3749250B46A6}
Step 3
Delete this registry value
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
- 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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