TROJ_SCAR.VTG
ERROR (Sunbelt)
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
2,956,800 bytes
EXE
Yes
26 Apr 2012
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%\Windupdt\winupdate.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%\Windupdt
(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
winupdater = "%System Root%\Windupdt\winupdate.exe"
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
UserInit = "%System%\userinit.exe,%System Root%\Windupdt\winupdate.exe"
(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)
Other System Modifications
This Trojan deletes the following files:
- %Windows%\Addresses.TMP
- %Windows%\Memory.TMP
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Enigma Protector\
28B621751F49F654-09F33A2659E7B90A\3842CAC48223B9A0-9A50CC0D9B84756F
HKEY_CURRENT_USER\Software\DC3_FEXEC
HKEY_CURRENT_USER\Software\sang sinsang
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Enigma Protector\
28B621751F49F654-09F33A2659E7B90A\3842CAC48223B9A0-9A50CC0D9B84756F
6CCFFA97 = "{random values}"
HKEY_CURRENT_USER\Software\sang sinsang
Undo = "1"
HKEY_CURRENT_USER\Software\sang sinsang
Advanced = "1"
HKEY_CURRENT_USER\Software\sang sinsang
SeperateThread = "1"
HKEY_CURRENT_USER\Software\sang sinsang
Use hyp27scan if posible = "0"
HKEY_CURRENT_USER\Software\sang sinsang
ScanThreadpriority = "4"
HKEY_CURRENT_USER\Software\sang sinsang
First Time User = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = "0"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wscsvc
Start = "4"
(Note: The default value data of the said registry entry is 2.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
Identify and delete files detected as TROJ_SCAR.VTG using either the Startup Disk or Recovery Console
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\Enigma Protector\28B621751F49F654-09F33A2659E7B90A
- 3842CAC48223B9A0-9A50CC0D9B84756F
- In HKEY_CURRENT_USER\Software
- DC3_FEXEC
- In HKEY_CURRENT_USER\Software
- sang sinsang
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- System
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
- winupdater = "%System Root%\Windupdt\winupdate.exe"
- In HKEY_CURRENT_USER\Software\Enigma Protector\28B621751F49F654-09F33A2659E7B90A\3842CAC48223B9A0-9A50CC0D9B84756F
- 6CCFFA97 = "{random values}"
- In HKEY_CURRENT_USER\Software\sang sinsang
- Undo = "1"
- In HKEY_CURRENT_USER\Software\sang sinsang
- Advanced = "1"
- In HKEY_CURRENT_USER\Software\sang sinsang
- SeperateThread = "1"
- In HKEY_CURRENT_USER\Software\sang sinsang
- Use hyp27scan if posible = "0"
- In HKEY_CURRENT_USER\Software\sang sinsang
- ScanThreadpriority = "4"
- In HKEY_CURRENT_USER\Software\sang sinsang
- First Time User = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- EnableFirewall = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- EnableLUA = "0"
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\wscsvc
- From: Start = "4"
To: Start = ""2""
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: UserInit = "%System%\userinit.exe,%System Root%\Windupdt\winupdate.exe"
To: UserInit = ""%Windows%\system32\userinit.exe,""
- From: UserInit = "%System%\userinit.exe,%System Root%\Windupdt\winupdate.exe"
Step 6
Search and delete this folder
- %System Root%\Windupdt
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_SCAR.VTG. 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 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.
- %Windows%\Addresses.TMP
- %Windows%\Memory.TMP
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