TROJ_BUZUS.EO
TrojanDownloader:Win32/Renos.KC (Microsoft)
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan may be unknowingly downloaded by a user while visiting malicious websites.
This file contains a URL where it connects to possibly download other files. It deletes itself after execution.
TECHNICAL DETAILS
336,303 bytes
PE
No
11 Mar 2011
Modifies HOSTS file
Arrival Details
This Trojan may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This Trojan drops and executes the following files:
- %System%\msxmlrr.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows 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\policies\
Explorer\Run
{random} = "%System%\msxmlrr.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\GHUZPSK
HKEY_LOCAL_MACHINE\SOFTWARE\GHUZPSK
It adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\GHUZPSK
{random} = "{hex values}"
HKEY_LOCAL_MACHINE\SOFTWARE\GHUZPSK
{random} = "{hex values}"
HOSTS File Modification
This Trojan overwrites the system's HOSTS files to prevent users from accessing the following websites:
- thepiratebay.org
- www.thepiratebay.org
- mininova.org
- www.mininova.org
- forum.mininova.org
- blog.mininova.org
- suprbay.org
- www.suprbay.org
Other Details
This file contains a URL where it connects to possibly download other files. As of this writing, this file contains the following URLs:
- {BLOCKED}ebspeed.net/html/license_{hex values}
It deletes itself after execution.
SOLUTION
8.900
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
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\policies\Explorer\Run
- {random} = %System%\msxmlrr.exe
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
- GHUZPSK
- In HKEY_LOCAL_MACHINE\SOFTWARE
- GHUZPSK
Step 4
Search and delete this file
- %System%\msxmlrr.exe
Step 5
Remove these strings added by the malware/grayware/spyware in the HOSTS file
- 127.0.0.1 thepiratebay.org
- 127.0.0.1 www .thepiratebay.org
- 127.0.0.1 mininova.org
- 127.0.0.1 www .mininova.org
- 127.0.0.1 forum.mininova.org
- 127.0.0.1 blog.mininova.org
- 127.0.0.1 suprbay.org
- 127.0.0.1 www .suprbay.org
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_BUZUS.EO. 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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