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Threat Encyclopedia

TSPY_GAUSS.A

ANALYSIS BY

Roland Marco Dela Paz


ALIASES:

W32.Gauss (Symantec); Trojan-Spy.Win32.Gauss (Kaspersky)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:
REPORTED INFECTION:
SYSTEM IMPACT RATING:
INFORMATION EXPOSURE:

  • Threat Type:Spyware

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.320.04

FIRST VSAPI PATTERN DATE:

14 Aug 2012

VSAPI OPR PATTERN File:

9.321.00

VSAPI OPR PATTERN Date:

14 Aug 2012

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

Remove malware files dropped/downloaded by TSPY_GAUSS.A

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

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\SOFTWARE\Microsoft\Windows\CurrentVersion\Reliability
    • TimeStampForUI = {data}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Reliability
    • ShutdownIntervalSnapshotUI = {data}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Reliability
    • ShutdownInterval = {data}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts
    • Palida Narrow (TrueType) = pldnrfn.ttf

Step 5

Restore this modified registry value

[ Learn More ]

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\CLSID\{CLSID}\InProcServer32
    • From: Default = %System%\wbem\wmihlp32.dll
      To: Default = %System%\wbem\wbemsvc.dll

Step 6

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • {removable drive letter}:\.Backup0{character}
  • {removable drive letter}:\.Backup00{character}

Step 7

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %User Temp%\~shw.tmp
  • %User Temp%\~gdl.tmp
  • %User Temp%\~mdk.tmp
  • %User Temp%\md.bak
  • %Windows%\system\Temp\s61cs3.dat
  • %Windows%\temp\~ZM6AD3.tmp
  • %User Temp%\ws1bin.dat
  • %Windows%\Fonts\pldnrfn.ttf
  • {removable drive letter}:\thumbs.db

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_GAUSS.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 9

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.


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