TROJ_BUZUS.DGE
VirTool:Win32/DelfInject.gen!CP (Microsoft); Generic PWS.aac (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Inject.eglm (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Gen:Heur.SEF.1 (FSecure)
Windows 2000, Windows XP, Windows Server 2003

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:
- %System Root%\Arquivos de programas\AplqbbN\BqsiarN\FfhfkyN.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It creates the following folders:
- %System Root%\Arquivos de programas
- %System Root%\Arquivos de programas\AplqbbN
- %System Root%\Arquivos de programas\AplqbbN\GefccoI
- %System Root%\Arquivos de programas\AplqbbN\BqsiarN
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
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
FfhfkyN = "%System Root%\Arquivos de programas\AplqbbN\BqsiarN\FfhfkyN.exe -Start"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\sistemanet
hkey_local_machine\software\microsoft\
esent\process\{malware file name}
hkey_local_machine\software\microsoft\
esent\process\{malware file name}\
debug
It adds the following registry entries:
HKEY_CURRENT_USER\Software\sistemanet
direct = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
name1 = "jgojaobjaodjaobjaogjabajgh)"
HKEY_CURRENT_USER\Software\sistemanet
lugarjpg = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
dir2 = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
dir = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
lk1 = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
lk2 = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
lk3 = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
lk4 = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
l001 = "jaai)"
HKEY_CURRENT_USER\Software\sistemanet
md9l = "jaaejaoejaoi)"
HKEY_CURRENT_USER\Software\sistemanet
l002 = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
md9 = "jaaejaoejaoi)"
HKEY_CURRENT_USER\Software\sistemanet
data = "jdhjef)"
HKEY_CURRENT_USER\Software\sistemanet
string = "{random characters}"
HKEY_CURRENT_USER\Software\sistemanet
tbl = "jhdjffjiejgcjghjhdjhbjfejghjhcjgojfijhbjgcjhfjfijgf)"
HKEY_CURRENT_USER\Software\sistemanet
xxx = "jaaejaoejaoi)"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
EventMessageFile = "%System%\ESENT.dll"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
CategoryMessageFile = "%System%\ESENT.dll"
(Note: The default value data of the said registry entry is {random values}.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
CategoryCount = "1"
(Note: The default value data of the said registry entry is 10.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
ESENT
TypesSupported = "7"
(Note: The default value data of the said registry entry is 7.)
Dropping Routine
This Trojan drops the following files:
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\md9.bmp
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\039-md9
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\icon6.ico
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\icon8.ico
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\it001.html
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\it002.html
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\it003.html
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\img6l.bmp
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\img6r.bmp
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\img8l.bmp
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\img8r.bmp
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\md6.bmp
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\039-md6
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\md10.bmp
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\039-md10
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
This report is generated via an automated analysis system.
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
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
- sistemanet
- In hkey_local_machine\software\microsoft\esent\process
- {malware file name}
- In hkey_local_machine\software\microsoft\esent\process\{malware file name}
- debug
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
- FfhfkyN = "%System Root%\Arquivos de programas\AplqbbN\BqsiarN\FfhfkyN.exe -Start"
- In HKEY_CURRENT_USER\Software\sistemanet
- direct = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- name1 = "jgojaobjaodjaobjaogjabajgh)"
- In HKEY_CURRENT_USER\Software\sistemanet
- lugarjpg = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- dir2 = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- dir = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- lk1 = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- lk2 = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- lk3 = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- lk4 = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- l001 = "jaai)"
- In HKEY_CURRENT_USER\Software\sistemanet
- md9l = "jaaejaoejaoi)"
- In HKEY_CURRENT_USER\Software\sistemanet
- l002 = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- md9 = "jaaejaoejaoi)"
- In HKEY_CURRENT_USER\Software\sistemanet
- data = "jdhjef)"
- In HKEY_CURRENT_USER\Software\sistemanet
- string = "{random characters}"
- In HKEY_CURRENT_USER\Software\sistemanet
- tbl = "jhdjffjiejgcjghjhdjhbjfejghjhcjgojfijhbjgcjhfjfijgf)"
- In HKEY_CURRENT_USER\Software\sistemanet
- xxx = "jaaejaoejaoi)"
Step 5
Restore this modified 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\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: EventMessageFile = "%System%\ESENT.dll"
To: EventMessageFile = ""{random values}""
- From: EventMessageFile = "%System%\ESENT.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: CategoryMessageFile = "%System%\ESENT.dll"
To: CategoryMessageFile = ""{random values}""
- From: CategoryMessageFile = "%System%\ESENT.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: CategoryCount = "1"
To: CategoryCount = ""10""
- From: CategoryCount = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\ESENT
- From: TypesSupported = "7"
To: TypesSupported = ""7""
- From: TypesSupported = "7"
Step 6
Search and delete these files
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\md9.bmp
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\039-md9
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\icon6.ico
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\icon8.ico
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\it001.html
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\it002.html
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\it003.html
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\img6l.bmp
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\img6r.bmp
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\img8l.bmp
- %System Root%\Arquivos de programas\AplqbbN\GefccoI\img8r.bmp
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\md6.bmp
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\039-md6
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\md10.bmp
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL\039-md10
Step 7
Search and delete these folders
- %System Root%\Arquivos de programas
- %System Root%\Arquivos de programas\AplqbbN
- %System Root%\Arquivos de programas\AplqbbN\GefccoI
- %System Root%\Arquivos de programas\AplqbbN\BqsiarN
- %System Root%\Arquivos de programas\AplqbbN\BpfudkL
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BUZUS.DGE. 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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