TROJ_BANLOAD.HWK
Trojan.Win32.Generic!BT (Sunbelt), Trojan horse Dropper.Generic8.XNJ (AVG), Gen:Variant.Symmi.14016 (BitDefender), W32/Banload.RYM!tr.dldr (Fortinet)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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 files:
- %Application Data%\drivers\1ctrl2580.vxd
- %Application Data%\drivers\rtl2108.rtl
- %Application Data%\drivers\rtl256.vxd
- %Application Data%\drivers\rtl3264.vxd
- %Application Data%\drivers\rtl745G.vxd
- %Application Data%\drivers\rtl8194.vxd
- %Application Data%\drivers\rtl9976.vxd
- %Application Data%\Microsoft\Windows\Themes\vdscreen.sys
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It creates the following folders:
- %User Profile%\Application Data\drivers
(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.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Recovery
AutoRecover = "2"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
DisableScriptDebuggerIE = "yes"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
PlaySounds = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Error Dlg Displayed On Every Error = "no"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs
{GUID1} = {RANDOM_HEX_VALUES}
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs
{GUID2} = {RANDOM_HEX_VALUES}
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Disable Script Debugger = "yes"
(Note: The default value data of the said registry entry is "no".)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
StartPage
ProgramsCache = {RANDOM_HEX_VALUES}
(Note: The default value data of the said registry entry is {RANDOM_HEX_VALUES}.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
StartPage
StartMenu_Balloon_Time = {RANDOM_HEX_VALUES}
(Note: The default value data of the said registry entry is {RANDOM_HEX_VALUES}.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs
MRUListEx = {RANDOM_HEX_VALUES}
(Note: The default value data of the said registry entry is {RANDOM_HEX_VALUES}.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
RecentDocs\.cpl
MRUListEx = {RANDOM_HEX_VALUES}
(Note: The default value data of the said registry entry is {RANDOM_HEX_VALUES}.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Connections
SavedLegacySettings = {RANDOM_HEX_VALUES}
(Note: The default value data of the said registry entry is {RANDOM_HEX_VALUES}.)
It deletes the following registry keys:
HKEY_CURRENT_USER\AppEvents\Schemes\
Apps\Explorer\Navigating\
.Current
Other Details
This Trojan connects to the following URL(s) to check for an Internet connection:
- www.google.com.br
It connects to the following possibly malicious URL:
- http://{BLOCKED}ljesuino.com.br/cadastro/acesso.php
- http://www.{BLOCKED}letro.com.br/swf_files/padre.swf
- http://www. {BLOCKED}letro.com.br/swf_files/nave.swf
- http://www.{BLOCKED}letro.com.br/swf_files/tche.swf
- http://www.{BLOCKED}letro.com.br/swf_files/status.swf
- http://www.l{BLOCKED}letro.com.br/swf_files/ardiana.swf
- http://www.{BLOCKED}eletro.com.br/swf_files/ceu.swf
- http://www.{BLOCKED}letro2012.com.br/angel.gif
NOTES:
It drops the following file in the User Startup folder to enable its automatic execution at every system startup:
- %User Profile%\Start Menu\Programs\Startup\netB0B2D6E3security.cpl
It creates the following shortcuts:
- %User Profile%\Recent\{FOLDER_LOCATION_OF_THE_MALWARE}.lnk
- %User Profile%\Recent\{MALWARE_FILE_NAME}.cpl.lnk
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
Scan your computer with your Trend Micro product and note files detected as TROJ_BANLOAD.HWK
Step 3
Restart in Safe Mode
Step 4
Search and delete these folders
- %User Profile%\Application Data\drivers
Step 5
Search and delete this file
- %Application Data%\Microsoft\Windows\Themes\vdscreen.sys
- %User Profile%\Start Menu\Programs\Startup\netB0B2D6E3security.cpl
- %User Profile%\Recent\{FOLDER_LOCATION_OF_THE_MALWARE}.lnk
- %User Profile%\Recent\{MALWARE_FILE_NAME}.cpl.lnk
Step 6
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\Internet Explorer\Recovery
- AutoRecover = "2"
- AutoRecover = "2"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- DisableScriptDebuggerIE = "yes"
- DisableScriptDebuggerIE = "yes"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- PlaySounds = "0"
- PlaySounds = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- Error Dlg Displayed On Every Error = "no"
- Error Dlg Displayed On Every Error = "no"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs
- {GUID1} = {RANDOM_HEX_VALUES}
- {GUID1} = {RANDOM_HEX_VALUES}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs
- {GUID2} = {RANDOM_HEX_VALUES}
- {GUID2} = {RANDOM_HEX_VALUES}
Step 7
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_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- From: Disable Script Debugger = "yes"
To: Disable Script Debugger = "no"
- From: Disable Script Debugger = "yes"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\StartPage
- From: ProgramsCache = {RANDOM_HEX_VALUES}
To: ProgramsCache = {RANDOM_HEX_VALUES}
- From: ProgramsCache = {RANDOM_HEX_VALUES}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\StartPage
- From: StartMenu_Balloon_Time = {RANDOM_HEX_VALUES}
To: StartMenu_Balloon_Time = {RANDOM_HEX_VALUES}
- From: StartMenu_Balloon_Time = {RANDOM_HEX_VALUES}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs
- From: MRUListEx = {RANDOM_HEX_VALUES}
To: MRUListEx = {RANDOM_HEX_VALUES}
- From: MRUListEx = {RANDOM_HEX_VALUES}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs\.cpl
- From: MRUListEx = {RANDOM_HEX_VALUES}
To: MRUListEx = {RANDOM_HEX_VALUES}
- From: MRUListEx = {RANDOM_HEX_VALUES}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections
- From: SavedLegacySettings = {RANDOM_HEX_VALUES}
To: SavedLegacySettings = {RANDOM_HEX_VALUES}
- From: SavedLegacySettings = {RANDOM_HEX_VALUES}
Step 8
Restore this deleted registry key/value from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating
- .Current
- .Current
Step 9
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BANLOAD.HWK. 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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