Analysis by: Nikko Tamana
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 27,136 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 06 Feb 2013
Payload: Drops files

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_DROPPER.YBR

Dropping Routine

This Trojan drops the following files:

  • %Temp%\NfIpv6.ocx - Detected as BKDR_NFLOG.YBR
  • %Temp%\YahooCache.ini

(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.)

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Other Details

This Trojan deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.712.02
FIRST VSAPI PATTERN DATE: 06 Feb 2013
VSAPI OPR PATTERN File: 9.713.00
VSAPI OPR PATTERN Date: 07 Feb 2013

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

Remove malware/grayware files that dropped/downloaded TROJ_NFLOG.YBR

    • TROJ_DROPPER.YBR

Step 3

Remove the malware/grayware file dropped/downloaded by TROJ_NFLOG.YBR

    • BKDR_NFLOG.YBR

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.
  • %Temp%\YahooCache.ini

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_NFLOG.YBR. 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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