BKDR_BLADABINDI.YYRT
Windows
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.
TECHNICAL DETAILS
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%\Server.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.)
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
7e8788fe25fc3699a4ad044fadd463ea = "%User Temp%\Server.exe" ..
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
7e8788fe25fc3699a4ad044fadd463ea = "%User Temp%\Server.exe" ..
It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\7e8788fe25fc3699a4ad044fadd463ea.exe ► copy of the malware
(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 keys:
HKEY_CURRENT_USER\Software\7e8788fe25fc3699a4ad044fadd463ea
It adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"
HKEY_CURRENT_USER\Software\7e8788fe25fc3699a4ad044fadd463ea
[kl] = “{Keyboard Logs}”
Other Details
This backdoor connects to the following possibly malicious URL:
- {BLOCKED}.{BLOCKED}.33.97:3270
SOLUTION
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
Identify and terminate files detected as BKDR_BLADABINDI.YYRT
- 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 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.
- HKEY_CURRENT_USER\Software\7e8788fe25fc3699a4ad044fadd463ea
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
- 7e8788fe25fc3699a4ad044fadd463ea = "%User Temp%\Server.exe" ..
- 7e8788fe25fc3699a4ad044fadd463ea = "%User Temp%\Server.exe" ..
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- 7e8788fe25fc3699a4ad044fadd463ea = "%User Temp%\Server.exe" ..
- 7e8788fe25fc3699a4ad044fadd463ea = "%User Temp%\Server.exe" ..
- In HKEY_CURRENT_USER\Environment
- SEE_MASK_NOZONECHECKS = "1"
- SEE_MASK_NOZONECHECKS = "1"
- In HKEY_CURRENT_USER\Software\7e8788fe25fc3699a4ad044fadd463ea
- [kl] = “{Keyboard Logs}”
- [kl] = “{Keyboard Logs}”
Step 5
Scan your computer with your Trend Micro product to delete files detected as BKDR_BLADABINDI.YYRT. 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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