TROJ_NSPAK.A
Trojan:Win32/Pepatch.E (Microsoft); W32/Winko.worm.gen (McAfee); Packed.Generic.115 (Symantec); Backdoor.Win32.Popwin.aur (Kaspersky); BehavesLike.Win32.Malware.ssc (mx-v) (Sunbelt); GenPack:Trojan.Generic.117474 (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
44,394 bytes
EXE
No
05 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%\husjdd8s.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other System Modifications
This Trojan deletes the following files:
- %System%\sddftj.dat
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry keys:
HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\husjdd8s
HKEY_LOCAL_MACHINE\Software\Microsoft\
Internet Explorer\New Windows
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\New Windows
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\husjdd8s
Description = "k1"
HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\husjdd8s
Description = "k1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\husjdd8s
DisplayName = "husjdd8s"
HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\husjdd8s
DisplayName = "husjdd8s"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\husjdd8s
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\husjdd8s
ImagePath = "%System%\husjdd8s.exe -j"
HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\husjdd8s
ImagePath = "%System%\husjdd8s.exe -j"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\husjdd8s
ObjectName = "LocalSystem"
HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\husjdd8s
ObjectName = "LocalSystem"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\husjdd8s
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\husjdd8s
Type = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\New Windows
PopupMgr = "no"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\New Windows
PopupMgr = "no"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT
ReportBootOk = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
PCHealth\ErrorReporting
DoReport = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
PCHealth\ErrorReporting
ShowUI = "0"
(Note: The default value data of the said registry entry is 1.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ERSvc\Parameters
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ERSvc\Security
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ERSvc\Enum
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ERSvc
Dropping Routine
This Trojan drops the following files:
- %System%\KillMe.bat
- %System%\osiesd3.dll
- %System%\kksi8s3.exe
- %System%\fd1109734674.dat
- %System%\husjdd8s.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://popwin.{BLOCKED}3.com/alexa.txt
- http://{BLOCKED}0.21.4/info.cnt?{random characters}
This report is generated via an automated analysis system.
SOLUTION
9.200
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\SYSTEM\CurrentControlSet\Services
- husjdd8s
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer
- New Windows
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer
- New Windows
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_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\husjdd8s
- Description = "k1"
- In HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Services\husjdd8s
- Description = "k1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\husjdd8s
- DisplayName = "husjdd8s"
- In HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Services\husjdd8s
- DisplayName = "husjdd8s"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\husjdd8s
- ErrorControl = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\husjdd8s
- ImagePath = "%System%\husjdd8s.exe -j"
- In HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Services\husjdd8s
- ImagePath = "%System%\husjdd8s.exe -j"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\husjdd8s
- ObjectName = "LocalSystem"
- In HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Services\husjdd8s
- ObjectName = "LocalSystem"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\husjdd8s
- Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\husjdd8s
- Type = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\New Windows
- PopupMgr = "no"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\New Windows
- PopupMgr = "no"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT
- ReportBootOk = "1"
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\PCHealth\ErrorReporting
- From: DoReport = "0"
To: DoReport = ""1""
- From: DoReport = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PCHealth\ErrorReporting
- From: ShowUI = "0"
To: ShowUI = ""1""
- From: ShowUI = "0"
Step 5
Search and delete these components
- %System%\KillMe.bat
- %System%\osiesd3.dll
- %System%\kksi8s3.exe
- %System%\fd1109734674.dat
- %System%\husjdd8s.exe
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_NSPAK.A. 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.
- %System%\sddftj.dat
Step 8
Restore these deleted registry keys/values 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_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ERSvc
- Parameters
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ERSvc
- Security
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ERSvc
- Enum
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- ERSvc
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