TSPY_PAPRAS.KO

November 16, 2013
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

140,288 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

16 Nov 2013

Arrival Details

This spyware 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 spyware adds the following registry keys:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Control\Session Manager\AppCertDlls

HKEY_CURRENT_USER\SOFTWARE\AppDataLow\
7926A403-841D-130B-56BD-F8F7EA41AC1B

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Session Manager\AppCertDlls
chknhost = "%System%\blasfmon.dll"

HKEY_CURRENT_USER\Software\AppDataLow\
7926A403-841D-130B-56BD-F8F7EA41AC1B
Client = "{random values}"

Dropping Routine

This spyware drops the following files:

  • %System Root%\63093.bat

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other Details

This spyware deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

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

[ 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\System\CurrentControlSet\Control\Session Manager
    • AppCertDlls
  • In HKEY_CURRENT_USER\SOFTWARE\AppDataLow
    • 7926A403-841D-130B-56BD-F8F7EA41AC1B

Step 3

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\SYSTEM\ControlSet001\Control\Session Manager\AppCertDlls
    • chknhost = "%System%\blasfmon.dll"
  • In HKEY_CURRENT_USER\Software\AppDataLow\7926A403-841D-130B-56BD-F8F7EA41AC1B
    • Client = "{random values}"

Step 4

Search and delete this file

[ Learn More ]
There may be some 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.
  • %System Root%\63093.bat

Step 5

Scan your computer with your Trend Micro product to delete files detected as TSPY_PAPRAS.KO. 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.


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