TROJ_MUFANOM.AN
Trojan:Win32/Hiloti.gen!D (Microsoft); Trojan.Zefarch!gen (Symantec); Hiloti.gen.e (McAfee); Trojan-Downloader.Win32.Mufanom.aqda (Kaspersky)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan 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
62,976 bytes
EXE
Yes
15 Oct 2009
Arrival Details
This Trojan 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 Trojan drops the following files:
- %Windows%\{random file name}.dll
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "rundll32.exe "%Windows%\{random filename}.dll",Startup"
Other System Modifications
This Trojan adds the following registry keys as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\{random}
Other Details
This Trojan connects to the following possibly malicious URL:
- {12 random alpha-numeric characters}.{7 random letters}.com
SOLUTION
9.200
6.546.01
15 Oct 2009
6.547.00
16 Oct 2009
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.AN
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random} = "rundll32.exe "%Windows%\{random filename}.dll",Startup"
- {random} = "rundll32.exe "%Windows%\{random filename}.dll",Startup"
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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
- {random}
- {random}
Step 6
Search and delete this file
- %Windows%\{random file name}.dll
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_MUFANOM.AN. 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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