TROJ_STARTPA.IN
Trojan:Win32/Sisproc, TrojanDownloader:Win32/Troxen!rts (Microsoft); Trojan.Startpage (Symantec); Trojan-Downloader.BAT.Agent.fy (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan horse Startpage.ISD (AVG)
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
191,524 bytes
EXE
No
08 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.
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nsq1.tmp
- %Windows%\RegText.reg
(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.. %Windows% is the Windows folder, which is usually C:\Windows.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\Shell\
Open(&O)
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\Shell\
Open(&O)\Command
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\Shell\
ÊôÐÔ(&R)\Command
HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Settings
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\ClassicStartMenu
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@C:\WINDOWS\system32\SHELL32.dll,-30520 = "Internet Explorer"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@C:\WINDOWS.0\system32\SHELL32.dll,-30520 = "Internet Explorer"
HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Settings
JITDebug = "0"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
HideDesktopIcons\NewStartPanel
{871C5380-42A0-1069-A2EA-08002B30309D} = "1"
(Note: The default value data of the said registry entry is 1.)
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\ShellFolder
Attributes = "0"
(Note: The default value data of the said registry entry is 20180000.)
Dropping Routine
This Trojan drops the following files:
- %System Root%\av.exe
- %System Root%\g.exe
- %Program Files%\winrar\iexplore.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
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
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\CurrentVersion\Explorer\HideDesktopIcons
- ClassicStartMenu
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons
- NewStartPanel
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\Shell
- Open(&O)
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\Shell\Open(&O)
- Command
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\Shell\ÊôÐÔ(&R)
- Command
- In HKEY_CURRENT_USER\Software\Microsoft\Windows Script
- Settings
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\ClassicStartMenu
- {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\NewStartPanel
- {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\ClassicStartMenu
- {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
- @C:\WINDOWS\system32\SHELL32.dll,-30520 = "Internet Explorer"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
- @C:\WINDOWS.0\system32\SHELL32.dll,-30520 = "Internet Explorer"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows Script\Settings
- JITDebug = "0"
Step 4
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\HideDesktopIcons\NewStartPanel
- From: {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
To: {871C5380-42A0-1069-A2EA-08002B30309D} = ""1""
- From: {871C5380-42A0-1069-A2EA-08002B30309D} = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{e17d4fc0-5564-11d1-83f2-00a0c90dc849}\ShellFolder
- From: Attributes = "0"
To: Attributes = ""20180000""
- From: Attributes = "0"
Step 5
Search and delete these components
- %System Root%\av.exe
- %System Root%\g.exe
- %Program Files%\winrar\iexplore.exe
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_STARTPA.IN. 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 7
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Temp%\nsq1.tmp
- %Windows%\RegText.reg
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