Analysis by: Jeanne Jocson
 PLATFORM:

Windows, Linux, Mac OS

 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

This Trojan may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size: 1,585 bytes
File Type: Script
Memory Resident: No
Initial Samples Received Date: 18 Apr 2016
Payload: Connects to URLs/IPs

Arrival Details

This Trojan may be hosted on a website and run when a user accesses the said website.

Installation

This Trojan adds the following processes:

  • If running in Windows environment:
    • cmd.exe /c taskkill /F java.exe
    • cmd.exe /c taskkill /F javaw.exe
    • cmd.exe /c javaw -cp %temp%\jb.jar Client
    • cmd.exe /c javaw -cp %temp%\javaws.jar Client
  • If running in Non-Windows environment:
    • /bin/sh -c killall -9 java
    • /bin/sh -c java -cp {Temporary directory}/jb.jar Client
    • /bin/sh -c java -cp {Temporary directory}/javaws.jar Client

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.129.106/jb.jar
  • http://{BLOCKED}.{BLOCKED}.144.58/javaws.jar

It saves the files it downloads using the following names:

  • %temp%\jb.jar
  • %temp%\javaws.jar
  • {Temporary directory}/jb.jar-For Non-Windows environment
  • {Temporary directory}/javaws.jar-For Non-Windows environment

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 12.860.06
FIRST VSAPI PATTERN DATE: 26 Oct 2016
VSAPI OPR PATTERN File: 12.861.00
VSAPI OPR PATTERN Date: 27 Oct 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

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.  %temp%\jb.jar
%temp%\javaws.jar

Step 4

Scan your computer with your Trend Micro product to delete files detected as JAVA_DLOADR.YYSPN. 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.

NOTES:

For Non-Windows platform:

Step 1

Delete the files using the noted path and file name. In the same Terminal, type the following commands:

  • sudo rm -R "{Temporary directory}/jb.jar”
  • sudo rm -R "{Temporary directory}/javaws.jar”

If the files are not present, you may proceed to last step.

Step 2

Scan your computer with your Trend Micro product to delete files detected as JAVA_DLOADR.YYSPN. 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.


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