TROJ_BUZUS.BKF
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
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
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 copies of itself into the affected system:
- %User Profile%\Application Data\afd.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} 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_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Cftmon32 = "%User Profile%\Application Data\afd.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Terminal Server\
Install\Software\Microsoft\
Windows\CurrentVersion\Run
Cftmon32 = "%User Profile%\Application Data\afd.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Terminal Server
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\NAP
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napagent\LocalConfig\
Enroll
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\napagent\LocalConfig\
UI
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Program Groups
48211218 = "48211218"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and filename} = "{malware path and filename}:*:Enabled:Cftmon32"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\NAP\Netsh\
Napmontr
BitNames = " NAP_TRACE_BASE NAP_TRACE_NETSH"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\NAP\Netsh\
Napmontr
Guid = "710adbf0-ce88-40b4-a50d-231ada6593f0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\NAP\Netsh
ControlFlags = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\NAP\Netsh
Active = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\NAP\Netsh
LogSessionName = "{hex values}"
SOLUTION
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_BUZUS.BKF
Step 3
Restart in Safe Mode
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_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion
- Terminal Server
- Terminal Server
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft
- NAP
- NAP
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\napagent\LocalConfig
- Enroll
- Enroll
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\napagent\LocalConfig
- UI
- UI
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Cftmon32 = "%User Profile%\Application Data\afd.exe"
- Cftmon32 = "%User Profile%\Application Data\afd.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Program Groups
- 48211218 = "48211218"
- 48211218 = "48211218"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {malware path and filename} = "{malware path and filename}:*:Enabled:Cftmon32"
- {malware path and filename} = "{malware path and filename}:*:Enabled:Cftmon32"
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BUZUS.BKF. 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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