JS_DLOADR.JBOK

September 15, 2015
 Analysis by: Pearl Charlaine Espejo
 ALIASES:

JS:Decode-BTB [Trj] (Avast); JS/Kryptik.ALB (ESET-NOD32); JS/Kryptik.ALB!tr (Fortinet); Script.Trojan.Agent.QJOC4O (GData); Trojan.JS.Crypt (Ikarus)

 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.

  TECHNICAL DETAILS

File Size:

1,667 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

25 Aug 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.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}l.net/dom/m1.js

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.876.05

FIRST VSAPI PATTERN DATE:

25 Aug 2015

VSAPI OPR PATTERN File:

11.877.00

VSAPI OPR PATTERN Date:

26 Aug 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

Close all opened browser windows

Step 3

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