Analysis by: Erika Bianca Mendoza
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

The file stub.log contains the following text:

start

Install Path : %UserTemp%\q0zyn718sq.dll

Start Write File

Start DLL File %UserTemp%\q0zyn718sq.dll FunctionName Install

end

delete start

It references a file called q0zyn718sq.dll and runs a function in the DLL. However, the said file is not available during testing.

This Trojan executes then deletes itself afterward.

  TECHNICAL DETAILS

File Size: 173 bytes
File Type: EXE
Memory Resident: Yes

Installation

This Trojan executes then deletes itself afterward.

  SOLUTION

Minimum Scan Engine: 8.900

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

Restart in Safe Mode

[ Learn More ]

Step 3

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.  %Desktop%\stub.log
%UserTemp%\q0zyn718sq.dll
DATA_GENERIC
Note: To do a search for the following files, right-click Start then click Search... or Find..., depending on the version of Windows you are running. For each file to be deleted, type its file name in the Named input box. In the Look In drop-down list, select My Computer, then press Enter.
  • Once located, select the file then press SHIFT+DELETE to permanently delete the file.
  • Repeat the said steps for all files listed.

    • Step 4

    Scan your computer with your Trend Micro product to delete files detected as TROJ_KRAP.AD. 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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