Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be downloaded by other malware/grayware from remote sites. It may be downloaded from remote sites by other malware.

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

  TECHNICAL DETAILS

File Size: 23,040 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 23 Feb 2012

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • TROJ_DLOADR.TYGS

It may be downloaded from remote site(s) by the following malware:

  • http://{BLOCKED}.{BLOCKED}.202.198/jp/soft2.rar

Installation

This Trojan drops and executes the following files:

  • %Windows%\Task\lsass.exe - BKDR_AGENT.TEYGS

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Dropping Routine

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

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.796.02
FIRST VSAPI PATTERN DATE: 23 Feb 2012
VSAPI OPR PATTERN File: 8.797.00
VSAPI OPR PATTERN Date: 24 Feb 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 the malware/grayware file that dropped/downloaded TROJ_DROPR.TYGS

     TROJ_DLOADR.TYGS

Step 3

Remove malware files dropped/downloaded by TROJ_DROPR.TYGS

    BKDR_AGENT.TEYGS

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPR.TYGS. 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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