BKDR_LIFTOH.QMUU
Trojan:Win32/Alureon.GC(Microsoft), Trojan.Win32.Yakes(Ikarus), Win32/Dorkbot.B worm(Eset)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
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 executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.
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:
- %Application Data%\{random}sacfsfdsf.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- -1_cc_{GUID}sacfsfdsf
It injects codes into the following process(es):
- explorer.exe
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
{random}sacfsfdsf = "%Application Data%\{random}sacfsfdsf.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\{random}sacfsfdsf
It adds the following registry entries:
HKEY_CURRENT_USER\Software\{random}sacfsfdsf
CurrentPath111 = "%Application Data%\{random}sacfsfdsf.exe"
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Download and execute arbitrary files
- Update itself
- Inject arbitrary routines to a running process
- Delete itself
- Send logs
- Edit configuration
It connects to the following websites to send and receive information:
- http://{BLOCKED}.{BLOCKED}njumbie.biz/images/gx.php
- http://{BLOCKED}.{BLOCKED}adio.su/images/gx.php
- http://{BLOCKED}.{BLOCKED}i.su/images/gx.php
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
- {random}sacfsfdsf
- {random}sacfsfdsf
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
- {random}sacfsfdsf = "%Application Data%\{random}sacfsfdsf.exe"
- {random}sacfsfdsf = "%Application Data%\{random}sacfsfdsf.exe"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_LIFTOH.QMUU. 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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