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W2KM_DLOADR.YYTBK

June 24, 2017
 Analysis by: Byron Jon Gelera
 ALIASES:

VBA/Kryptik.AP (ESET-NOD32); TrojanDownloader:O97M/Damatak (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

232,960 bytes

File Type:

DOC

Memory Resident:

Yes

Initial Samples Received Date:

22 Jun 2017

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.

Other Details

This Trojan connects to the following URL(s) to get the affected system's IP address:

  • http://api.ipify.org/

It connects to the following possibly malicious URL:

  • http://{BLOCKED}thimi.com/ls5/forum.php
  • http://{BLOCKED}rombut.com/ls5/forum.php
  • http://{BLOCKED}enebi.com/ls5/forum.php

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.484.07

FIRST VSAPI PATTERN DATE:

21 Jun 2017

VSAPI OPR PATTERN File:

13.485.00

VSAPI OPR PATTERN Date:

22 Jun 2017

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

Restart in Safe Mode

[ Learn More ]

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as W2KM_DLOADR.YYTBK. 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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