Analysis by: Jennifer Gumban
 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: Via email

This Trojan arrives as attachment to mass-mailed email messages.

As of this writing, the said sites are inaccessible.

This is the Trend Micro detection for files that contain a malicious script.

  TECHNICAL DETAILS

File Size: 5,454 bytes
File Type: VBS
Memory Resident: No
Initial Samples Received Date: 28 Aug 2017
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

This malware arrives via the following means:

  • It arrives as attachment to mass-mailed email messages containing the following subject:
    • photo
    • photos
    • pictures
    • documents
    • please print
    • images
    • scans

Download Routine

This Trojan accesses the following websites to download files:

  • {BLOCKED}.{BLOCKED}.198.131:80
  • http://{BLOCKED}gagap.net/HGhj46

It saves the files it downloads using the following names:

  • %User Temp%\gjsepbue.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Trend Micro detects the dowloaded file as:

  • Ransom_LOCKY family

As of this writing, the said sites are inaccessible.

Other Details

This is the Trend Micro detection for files that contain a malicious script.

  SOLUTION

Minimum Scan Engine: 9.850

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

Scan your computer with your Trend Micro product to clean files detected as VBS_LOCKY.DDBF. 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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