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TROJ_ARTIEF.TYGS

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

[NORTON]Trojan.Zbot,[SOPHOS]Exp/20103333-C

 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 arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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:

71,022 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

21 Feb 2012

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Trojan drops and executes the following files:

  • %User Temp%\1sass.exe - TROJ_DLOADR.TYGS

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

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:

8.792.03

FIRST VSAPI PATTERN DATE:

21 Feb 2012

VSAPI OPR PATTERN File:

8.793.00

VSAPI OPR PATTERN Date:

22 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 malware files dropped/downloaded by TROJ_ARTIEF.TYGS

     TROJ_DLOADR.TYGS

Step 3

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