Analysis by: Janus Agcaoili
ALIASES:

Trojan.Win32.Badur.htyo (Baidu-International), Trojan.Badur! (Agnitum), TR/Dldr.FlyStudio.BB (Avira)

 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

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: 376,116 bytes
File Type: EXE
File Compression: UPX
Memory Resident: No
Initial Samples Received Date: 02 Jun 2014
Payload: Displays message/message boxes

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 adds the following mutexes to ensure that only one of its copies runs at any one time:

  • zuixinjmbooo

Download Routine

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

  • {BLOCKED}n.{BLOCKED}5.com/jm.txt

As of this writing, the said sites are inaccessible.

Other Details

This Trojan displays the following message boxes:

Displayed when download fails then terminate itself

It does the following:

  • Displays a window when executed:
  • Reads data from config file for the URL and Filename to be used in its download routine

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 10.834.04
FIRST VSAPI PATTERN DATE: 02 Jun 2014
VSAPI OPR PATTERN File: 10.835.00
VSAPI OPR PATTERN Date: 03 Jun 2014

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

Scan your computer with your Trend Micro product to delete files detected as TROJ_BADUR.NJB. 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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