W2KM_NAMAGIF.C

April 18, 2015
 Analysis by: Cris Nowell Pantanilla
 Modified by: Jaime Benigno Reyes
 ALIASES:

TrojanDownloader:O97M/Adnel (Microsoft); W97M/Downloader.afy (McAfee); Trojan-Dropper.MSWord.Agent.it (Kaspersky); W97M.Downloader (Symantec)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

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:

35,840 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

07 Apr 2015

Arrival Details

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

Installation

This Trojan drops the following component file(s):

  • {Malware Path}\gyuFYFGuig.vbs - detected as VBS_DLOADER.CA

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:

9.750

FIRST VSAPI PATTERN FILE:

11.588.02

FIRST VSAPI PATTERN DATE:

07 Apr 2015

VSAPI OPR PATTERN File:

11.589.00

VSAPI OPR PATTERN Date:

08 Apr 2015

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove malware/grayware files dropped/downloaded by W2KM_NAMAGIF.C. (Note: Please skip this step if the threats listed below have already been removed.)

     
    • VBS_DLOADER.CA

Step 4

Scan your computer with your Trend Micro product to delete files detected as W2KM_NAMAGIF.C. 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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