BKDR_BLADABI.BFE
Backdoor:MSIL/Bladabindi (Microsoft); RDN/Generic BackDoor!bbr (McAfee); Backdoor.Win32.Androm.ggfk (Kaspersky); Troj/MSIL-BRU (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse MSIL6.CFVC (AVG)
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 Profile%\BANdlbaDzpO1WAC7\2KIjCL645aYh.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It creates the following folders:
- %User Profile%\Application Data\BANdlbaDzpO1WAC7
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
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
5jm3Vo3OcFY0eZM1 = "%User Profile%\BANdlbaDzpO1WAC7\2KIjCL645aYh.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\3c5eb2cd8dc5b15a1bc0ffe969b5f12c
It adds the following registry entries:
HKEY_CURRENT_USER
di = "!"
HKEY_CURRENT_USER\Environment
SEE_MASK_NOZONECHECKS = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and file name} = "{malware path and file name}:*:enabled:{malware file name}"
Other Details
This backdoor connects to the following possibly malicious URL:
- {BLOCKED}8.152.213
This report is generated via an automated analysis system.
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
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_CURRENT_USER\Software
- 3c5eb2cd8dc5b15a1bc0ffe969b5f12c
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
- 5jm3Vo3OcFY0eZM1 = "%User Profile%\BANdlbaDzpO1WAC7\2KIjCL645aYh.exe"
- In HKEY_CURRENT_USER
- di = "!"
- In HKEY_CURRENT_USER\Environment
- SEE_MASK_NOZONECHECKS = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {malware path and file name} = "{malware path and file name}:*:enabled:{malware file name}"
Step 5
Search and delete this folder
- %User Profile%\Application Data\BANdlbaDzpO1WAC7
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_BLADABI.BFE. 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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