BKDR_BREDOLAB.KA
Windows 2000, XP, Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It may be dropped by other malware.
TECHNICAL DETAILS
19,456 bytes
EXE
Yes
23 Nov 2010
Arrival Details
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It may be dropped by other malware.
Installation
This backdoor drops the following copies of itself into the affected system:
- %Application Data%\Help\iexplore.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
iexplore = %Application Data%\Help\iexplore.exe
Backdoor Routine
This backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}ItemDB.com:43/AWS96.jsp?{random characters}
- {BLOCKED}3.81.110
- {BLOCKED}9.46.11
Other Details
This backdoor does the following:
- Allows remote user could send the folowing commands to the affected system:
- cmd /c
- /put
- /run
- cmd /c
SOLUTION
8.900
7.644.04
23 Nov 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
Identify and terminate files detected as BKDR_BREDOLAB.KA
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Runiexplore = %Application Data%\Help\iexplore.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as BKDR_BREDOLAB.KA. 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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