TROJ_BUZUS.SMU
Trojan:Win32/Meredrop (Microsoft); Generic Dropper!1jc (McAfee); Trojan.Gen.2 (Symantec); Trojan.Win32.Buzus.izba (Kaspersky); Packed.Win32.Rebhip.a.1 (v) (Sunbelt)
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:
- %Windows%\InstallDir\Server.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It creates the following folders:
- %Windows%\InstallDir
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
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
HKLM = "%Windows%\InstallDir\Server.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKCU = "%Windows%\InstallDir\Server.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{5460C4DF-B266-909E-CB58-E32B79832EB2}
StubPath = "%Windows%\InstallDir\Server.exe restart"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKCU = "%Program Files%\Internet Explorer\iexplore.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Configs
HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\{5460C4DF-B266-909E-CB58-E32B79832EB2}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Configs
MyConfigs = "{random characters}"
HKEY_CURRENT_USER\Software\Configs
InstalledServer = "{malware path and file name}"
Dropping Routine
This Trojan drops the following files:
- %User Temp%\1.html
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
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
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
- Configs
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components
- {5460C4DF-B266-909E-CB58-E32B79832EB2}
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
- HKLM = "%Windows%\InstallDir\Server.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- HKCU = "%Windows%\InstallDir\Server.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{5460C4DF-B266-909E-CB58-E32B79832EB2}
- StubPath = "%Windows%\InstallDir\Server.exe restart"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- HKCU = "%Program Files%\Internet Explorer\iexplore.exe"
- In HKEY_CURRENT_USER\Software\Configs
- MyConfigs = "{random characters}"
- In HKEY_CURRENT_USER\Software\Configs
- InstalledServer = "{malware path and file name}"
Step 5
Search and delete this file
- %User Temp%\1.html
Step 6
Search and delete this folder
- %Windows%\InstallDir
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BUZUS.SMU. 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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