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W2KM_LOCKY.BYZ

May 31, 2016
 Modified by: Jennifer Gumban
 ALIASES:

TrojanDownloader:O97M/Donoff (Microsoft), VBA/TrojanDownloader.Agent.BCA trojan (ESET)

 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

Infection Channel:

Spammed via email

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

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

57,241 bytes

File Type:

DOC

Memory Resident:

Yes

Initial Samples Received Date:

20 May 2016

Payload:

Connects to URLs/IPs

Arrival Details

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

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}l.com.au/grh5444tg

It saves the files it downloads using the following names:

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.540.02

FIRST VSAPI PATTERN DATE:

21 May 2016

VSAPI OPR PATTERN File:

12.541.00

VSAPI OPR PATTERN Date:

22 May 2016

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_LOCKY.BYZ. (Note: Please skip this step if the threats listed below have already been removed.)

    • Ransom_LOCKY.BYZ

Step 4

Scan your computer with your Trend Micro product to clean files detected as W2KM_LOCKY.BYZ. 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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