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JS_DLOADR.Q

May 03, 2017
 Analysis by: Pearl Charlaine Espejo
 ALIASES:

JS.Downloader (Symantec); JS/DwnLdr-SOK (Sophos); TrojanDownloader:JS/Swabfex.P (Microsoft); Trojan.Downloader.JS.AAJ (BitDefender)

 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 may be dropped by other malware.

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

  TECHNICAL DETAILS

File Size:

1,037 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

13 Apr 2017

Arrival Details

This Trojan may be dropped by other malware.

This malware arrives via the following means:

  • It is embedded in a Microsoft Word Document file and will execute its routine upon activation by the user.

Download Routine

This Trojan saves the files it downloads using the following names:

  • %User Profile%\AppData\Roamingqiw12.Exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://se.{BLOCKED}edream.com/js80.bin?pdij

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

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.368.07

FIRST VSAPI PATTERN DATE:

28 Apr 2017

VSAPI OPR PATTERN File:

13.369.00

VSAPI OPR PATTERN Date:

29 Apr 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

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Profile%\AppData\Roamingqiw12.Exe

Step 4

Scan your computer with your Trend Micro product to clean files detected as JS_DLOADR.Q. 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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