BKDR_MORIX.POR
Trojan-Spy.Win32.Agent.cbot (Kaspersky), Backdoor:Win32/Morix.B (Microsoft), Win32/Farfli.KA trojan NOD32)
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:
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 modifies the Internet Explorer Zone Settings.
TECHNICAL DETAILS
154,112 bytes
EXE
Yes
07 Jun 2013
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:
- %Windows%\5D6B8EB5\svchsot.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It creates the following folders:
- %Windows%\5D6B8EB5
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
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
5D6B8EB5 = "%Windows%\5D6B8EB5\svchsot.exe"
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
rdchelp = "%Program Files%\Common Files\xkaoh.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\System\ControlSet001\
Control\MediaResources\msvideo
HKEY_LOCAL_MACHINE\System\InfoTime
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\System
DisableCMD = "0"
HKEY_LOCAL_MACHINE\SYSTEM\InfoTime
InfoTime = "{date}"
Web Browser Home Page and Search Page Modification
This backdoor modifies the Internet Explorer Zone Settings.
Dropping Routine
This backdoor drops the following files:
- %Program Files%\Common Files\xkaoh.exe
- {malware path}\xkaoh.exe
- %System%\drivers\etc\host.ics
- {malware path}\{malware file name}-up.txt
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %System% is the Windows system folder, which is usually C:\Windows\System32.)
Download Routine
This backdoor connects to the following URL(s) to download its component file(s):
- http://{BLOCKED}.98.236/xkaoh.exe
SOLUTION
9.300
9.966.02
07 Jun 2013
9.967.00
08 Jun 2013
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
Reset Internet security settings
Step 4
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_LOCAL_MACHINE\System\ControlSet001\Control\MediaResources
- msvideo
- msvideo
- In HKEY_LOCAL_MACHINE\System
- InfoTime
- InfoTime
Step 5
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
- 5D6B8EB5 = "%Windows%\5D6B8EB5\svchsot.exe"
- 5D6B8EB5 = "%Windows%\5D6B8EB5\svchsot.exe"
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- rdchelp = "%Program Files%\Common Files\xkaoh.exe"
- rdchelp = "%Program Files%\Common Files\xkaoh.exe"
- In HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System
- DisableCMD = "0"
- DisableCMD = "0"
Step 6
Search and delete this folder
- %Windows%\5D6B8EB5
Step 7
Search and delete these files
- %Program Files%\Common Files\xkaoh.exe
- {malware path}\xkaoh.exe
- %System%\drivers\etc\host.ics
- {malware path}\{malware file name}-up.txt
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_MORIX.POR. 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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