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TROJ_DLOADR.JCJ

June 08, 2015
 Analysis by: David John Agni
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

36,864 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 Jun 2015

Payload:

Downloads files

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.

Download Routine

This Trojan connects to the following URL(s) to download its configuration file:

  • http://www.{BLOCKED}x.cc/sxindex.html

It saves the files it downloads using the following names:

  • %System Root%\programdata\indem.sys

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

As of this writing, the said sites are inaccessible.

Other Details

This Trojan requires the existence of the following files to properly run:

  • %System Root%\programdata\indem.sys (deleted after use)
  • %System Root%\programdata\{filename}.dat (deleted after use)

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

NOTES:

If the malware successfully connects to http://www.{BLOCKED}x.cc/{filename}.html, it will read and decrypt the file %System Root%\programdata\{filename}.dat and will create and execute the file %System Root%\programdata\{filename}.exe.

  • Where {filename} depends on the content of the malicious site
  • However the said site are already cleane/doesn’t contain data related to this malware.

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.712.02

FIRST VSAPI PATTERN DATE:

05 Jun 2015

VSAPI OPR PATTERN File:

11.713.00

VSAPI OPR PATTERN Date:

06 Jun 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

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.
  • %System Root%\programdata\indem.sys
  • %System Root%\programdata\{filename}.dat
  • %System Root%\programdata\{filename}.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.JCJ. 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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