TROJ_BUZUS.TCC
VirTool:Win32/DelfInject.gen!AA (Microsoft); BackDoor-DOQ.gen.aj (McAfee); Suspicious.DLoader (Symantec); Trojan.Win32.Buzus.lba (Kaspersky); Trojan.Win32.Buzus.ahpd (v) (Sunbelt); Backdoor:W32/Bifrose.GGD (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild:
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
80,945 bytes
EXE
01 Oct 2011
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:
- %System%\Bifrost\server.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It creates the following folders:
- %System%\Bifrost
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other System Modifications
This Trojan deletes the following files:
- %System%\Bifrost\server.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Bifrost
HKEY_CURRENT_USER\SOFTWARE\Bifrost
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Bifrost
nck = {random values}
HKEY_CURRENT_USER\Software\Bifrost
klg = {random values}
HKEY_CURRENT_USER\Software\Bifrost
klg = {random values}
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\addons.dat
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
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
- Bifrost
- In HKEY_CURRENT_USER\SOFTWARE
- Bifrost
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
- msvideo
Step 3
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\Bifrost
- nck={random values}
- In HKEY_CURRENT_USER\Software\Bifrost
- klg={random values}
- In HKEY_CURRENT_USER\Software\Bifrost
- klg={random values}
Step 4
Search and delete this folder
Step 5
Search and delete this file
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_BUZUS.TCC. 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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