BKDR_BLADABI.SMC
Backdoor:MSIL/Bladabindi (Microsoft), Backdoor.MSIL.Agent.igo (Kaspersky), Backdoor.Ratenjay (Norton)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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 executes commands from a remote malicious user, effectively compromising the affected system.
It logs a user's keystrokes to steal information.
It connects to certain websites to send and receive information.
TECHNICAL DETAILS
24,064 bytes
EXE
Yes
17 Feb 2015
Connects to URLs/IPs, Compromises network security, Logs keystrokes
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 and executes them:
- %User Temp%\IDM.EXE
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- 97466d0d68ada90b16f12a92debf8c8b
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
97466d0d68ada90b16f12a92debf8c8b = "%User Temp%\IDM.EXE"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
97466d0d68ada90b16f12a92debf8c8b = "%User Temp%\IDM.EXE"
It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\97466d0d68ada90b16f12a92debf8c8b.exe
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Other System Modifications
This Backdoor adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"
HKEY_CURRENT_USER\Software\97466d0d68ada90b16f12a92debf8c8b
{string} = ""
where {string} can be any of the following:
- ll
- kl
- prof
- rn
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- Download and Execute files
- Compress files for uploading
- Load plugins
- Ping
- Registry Management
- Remote Shell Execution
- Restart
- Screenshot
- Uninstall Itself
- Update Itself
- Terminate Itself
Information Theft
This Backdoor logs a user's keystrokes to steal information.
Other Details
This Backdoor connects to the following website to send and receive information:
- {BLOCKED}ok-update.{BLOCKED}uake.com
It does the following:
- It executes the following command to bypass Windows Firewall:
- netsh firewall add allowedprogram "%User Temp%\IDM.EXE" "IDM.EXE" ENABLE
- It saves the stolen information in the created registry:
- HKEY_CURRENT_USER\Software\97466d0d68ada90b16f12a92debf8c8b
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
SOLUTION
9.850
11.485.50
17 Feb 2015
11.486.00
18 Feb 2015
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Identify and terminate files detected as BKDR_BLADABI.SMC
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- 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 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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- 97466d0d68ada90b16f12a92debf8c8b = "%User Temp%\IDM.EXE"
- 97466d0d68ada90b16f12a92debf8c8b = "%User Temp%\IDM.EXE"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- 97466d0d68ada90b16f12a92debf8c8b = "%User Temp%\IDM.EXE"
- 97466d0d68ada90b16f12a92debf8c8b = "%User Temp%\IDM.EXE"
- In HKEY_CURRENT_USER\Software
- 97466d0d68ada90b16f12a92debf8c8b
- 97466d0d68ada90b16f12a92debf8c8b
- In HKEY_CURRENT_USER\Environment
- SEE_MASK_NOZONECHECKS = "1"
- SEE_MASK_NOZONECHECKS = "1"
Step 5
Search and delete this file
- %User Temp%\IDM.EXE
- %User Startup%\97466d0d68ada90b16f12a92debf8c8b.exe
Step 6
Scan your computer with your Trend Micro product to delete files detected as BKDR_BLADABI.SMC. 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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