TROJ64_JBOSSER.C

October 17, 2016
 Analysis by: Jeanne Jocson
 ALIASES:

Trojan.Win64.Jbosser (Ikarus), Win64/Jbosser.C (NOD32)

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

282,624 bytes

File Type:

DLL

Initial Samples Received Date:

13 Oct 2016

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.

Installation

This Trojan creates the following folders:

  • C:\Documents and Settings\data (for XP and below)
  • C:\USERS\data (for Vista and later)

Download Routine

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

  • C:\Documents and Settings\data\{random filename}.dat (for XP and below)
  • C:\USERS\data\{random filename}.dat (for Vista and later)

Other Details

This Trojan connects to the following possibly malicious URL:

  • q1.{BLOCKED}aa.com

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.834.03

FIRST VSAPI PATTERN DATE:

13 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

Identify and terminate files detected as TROJ64_JBOSSER.C

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

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.  
  • C:\Documents and Settings\data\{random filename}.dat
  • C:\USERS\data\{random filename}.dat

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ64_JBOSSER.C. 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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