BKDR_BLADABINDI.XZU
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
460,288 bytes
EXE
No
30 Apr 2016
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.
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\a75fa231bd8cedac652bc32690eff881
It adds the following registry entries:
HKEY_CURRENT_USER
di = "!"
HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"
HKEY_CURRENT_USER
a75fa231bd8cedac652bc32690eff881 = "%User Temp%\CallFree.exe .."
HKEY_LOCAL_MACHINE
a75fa231bd8cedac652bc32690eff881 = "%User Temp%\CallFree.exe .."
Dropping Routine
This backdoor drops the following files:
- %User Temp%\CallFree.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.)
This report is generated via an automated analysis system.
SOLUTION
9.8
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
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_CURRENT_USER\Software
- a75fa231bd8cedac652bc32690eff881
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
- di = "!"
- In HKEY_CURRENT_USER\Environment
- SEE_MASK_NOZONECHECKS = "1"
- In HKEY_CURRENT_USER
- a75fa231bd8cedac652bc32690eff881 = "%User Temp%\CallFree.exe .."
- In HKEY_LOCAL_MACHINE
- a75fa231bd8cedac652bc32690eff881 = "%User Temp%\CallFree.exe .."
Step 4
Search and delete this file
- %User Temp%\CallFree.exe
Step 5
Scan your computer with your Trend Micro product to delete files detected as BKDR_BLADABINDI.XZU. 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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