TROJ_DL.DA375586
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
212,139 bytes
EXE
Yes
24 Oct 2013
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.
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
teste = "%User Profile%\Application Data\teste.exe"
Other System Modifications
This Trojan modifies the following file(s):
- %Start Menu%\Programs\Internet Explorer.lnk
(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\Shell\Associations\
UrlAssociations\ftp\UserChoice
HKEY_CURRENT_USER\Software\Microsoft\
Windows\Shell\Associations\
UrlAssociations\http\UserChoice
HKEY_CURRENT_USER\Software\Microsoft\
Windows\Shell\Associations\
UrlAssociations\https\UserChoice
HKEY_CURRENT_USER\Software\Classes\
ftp\shell\open\
command
HKEY_CURRENT_USER\Software\Classes\
http\shell\open\
command
HKEY_CURRENT_USER\Software\Classes\
https\shell\open\
command
HKEY_CURRENT_USER\Software\Policies\
Microsoft\Internet Explorer\Control Panel
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\Shell\Associations\
UrlAssociations\ftp\UserChoice
Progid = "ChromeHTML"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\Shell\Associations\
UrlAssociations\http\UserChoice
Progid = "ChromeHTML"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\Shell\Associations\
UrlAssociations\https\UserChoice
Progid = "ChromeHTML"
HKEY_CURRENT_USER\Software\Policies\
Microsoft\Internet Explorer\Control Panel
Connection Settings = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
AutoConfigUrl = "ZTTm://mCIk.mCIJBeeBI6AQTBmC7RBeA.RIt"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
ProxyHttp1.1 = "1"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
EnableHttp1_1 = "1"
(Note: The default value data of the said registry entry is 1.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\VB1.tmp
- %User Temp%\portatil.exe
(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.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}3.112.253/sfx.exe
- http://www.{BLOCKED}asorri.org.br/language/pt-BR/pt-BR.com_banners.txt
- http://www.{BLOCKED}da.com/modules/mod_sections/tmpl/index.txt
This report is generated via an automated analysis system.
SOLUTION
9.300
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\Microsoft\Windows\Shell\Associations\UrlAssociations\ftp
- UserChoice
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http
- UserChoice
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\https
- UserChoice
- In HKEY_CURRENT_USER\Software\Classes\ftp\shell\open
- command
- In HKEY_CURRENT_USER\Software\Classes\http\shell\open
- command
- In HKEY_CURRENT_USER\Software\Classes\https\shell\open
- command
- In HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer
- Control Panel
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
- teste = "%User Profile%\Application Data\teste.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\ftp\UserChoice
- Progid = "ChromeHTML"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice
- Progid = "ChromeHTML"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\https\UserChoice
- Progid = "ChromeHTML"
- In HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Control Panel
- Connection Settings = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- AutoConfigUrl = "ZTTm://mCIk.mCIJBeeBI6AQTBmC7RBeA.RIt"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- ProxyHttp1.1 = "1"
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- From: EnableHttp1_1 = "1"
To: EnableHttp1_1 = ""1""
- From: EnableHttp1_1 = "1"
Step 6
Search and delete these components
- %User Temp%\VB1.tmp
- %User Temp%\portatil.exe
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DL.DA375586. 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.
Step 8
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %Start Menu%\Programs\Internet Explorer.lnk
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