TROJ_MUFANOM.BQ
Windows 2000, XP, Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
TECHNICAL DETAILS
194,560 bytes
PE
Yes
15 Dec 2009
Terminates processes
Installation
This Trojan adds the following folders:
- %Application Data%\{random CLSID for Firefox}
- %Application Data%\{random CLSID for Firefox}\chrome
- %Application Data%\{random CLSID for Firefox}\chrome\content
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It drops the following files:
- %Application Data%\{random CLSID for Firefox}\chrome.manifest - non-malicious component
- %Application Data%\{random CLSID for Firefox}\install.rdf - non-malicious component
- %Application Data%\{random CLSID for Firefox}\chrome\content\_cfg.js - non-malicious component
- %Application Data%\{random CLSID for Firefox}\chrome\content\overlay.xul - non-malicious component
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random} = rundll32.exe "{malware path and file name}",Startup
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\{random key}
It adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\
Firefox\Extensions
{random CLSID for Firefox} = %Application Data%\{random CLSID for Firefox}
Process Termination
This Trojan terminates the following processes if found running in the affected system's memory:
- mrt.exe
SOLUTION
8.900
6.694.04
15 Dec 2009
7.536.03
13 Oct 2010
7.537.00
13 Oct 2010
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Scan your computer with your Trend Micro product and note files detected as TROJ_MUFANOM.BQ
Step 3
Restart in Safe Mode
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
- {random} = rundll32.exe {malware path and file name},Startup
- In HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Firefox\Extensions
- {random CLSID for Firefox} = %Application Data%\{random CLSID for Firefox}
Step 5
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\SOFTWARE\Microsoft\Windows\CurrentVersion
- {random key}
Step 6
Search and delete this folder
- %Application Data%\{random CLSID for Firefox}
Step 7
Search and delete the file detected as TROJ_MUFANOM.BQ
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