BKDR_BLBINDI.ENC
Windows 2000, Windows XP, Windows Server 2003
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.
It modifies the Internet Explorer Zone Settings.
TECHNICAL DETAILS
44,544 bytes
EXE
Yes
14 Feb 2014
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:
- %User Temp%\Trojan.exe
- %User Startup%\5cd8f17f4086744065eb0992a09e05a2.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
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
5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\5cd8f17f4086744065eb0992a09e05a2
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\{random value}
Active = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\{random value}
ControlFlags = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\{random value}
LogSessionName = "stdout"
HKEY_CURRENT_USER\Software\5cd8f17f4086744065eb0992a09e05a2
US = "{random symbol}"
HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Temp%\Trojan.exe = "{random characters}"
Web Browser Home Page and Search Page Modification
This backdoor modifies the Internet Explorer Zone Settings.
Dropping Routine
This backdoor drops the following files:
- "%User Temp%\Trojan.exe.tmp
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}softxx.no-ip.biz
SOLUTION
9.300
10.606.01
14 Feb 2014
10.607.00
15 Feb 2014
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
Restart in Safe Mode
Step 3
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\Windows NT\CurrentVersion\Tracing\Microsoft
- {random value} = ""
- {random value} = ""
- In HKEY_CURRENT_USER\Software
- 5cd8f17f4086744065eb0992a09e05a2 = ""
- 5cd8f17f4086744065eb0992a09e05a2 = ""
Step 4
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\Run
- 5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."
- 5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- 5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."
- 5cd8f17f4086744065eb0992a09e05a2 = "%User Temp%\Trojan.exe .."
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %User Profile%\Application Data\winrar.exe = "{random characters}"
- %User Profile%\Application Data\winrar.exe = "{random characters}"
- In HKEY_CURRENT_USER\Environment
- SEE_MASK_NOZONECHECKS = "1"
- SEE_MASK_NOZONECHECKS = "1"
Step 5
Search and delete these components
- %User Temp%\Trojan.exe.tmp
Step 6
Reset Internet security settings
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_BLBINDI.ENC. 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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