ALIASES:

Trojan.Win32.Badur.nber (Kaspersky)

 PLATFORM:

Windows

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

  • 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.

  TECHNICAL DETAILS

File Size: 81,920 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 10 Feb 2015

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:

  • %User Profile%\Windows Update
  • %User Profile%\Application Data\Chrome

(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.)

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\Windows Update\B1B022Fa.exe
  • %User Temp%\ADC5Bb31b3CDd012.txt
  • %User Startup%\B1B022Fa.lnk
  • %User Profile%\Chrome\manifest.json
  • %User Profile%\Chrome\jquery.min.js
  • %User Profile%\Chrome\background.js

(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.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://www.{BLOCKED}m.com.br/site/fotos_noticias/thumbs/letos_t.exe
  • http://{BLOCKED}em.com/c?{random characters}
  • http://{BLOCKED}em.com/v2/call/t//ext/manifest.json
  • http://{BLOCKED}em.com/v2/call/t//ext/jquery.min.js
  • http://{BLOCKED}em.com/v2/call/t//ext/background.js
  • http://{BLOCKED}em.com/v2/call/t/?f
  • {BLOCKED}0.1
  • {BLOCKED}.167.27
  • {BLOCKED}3.213.160

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.700

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

Search and delete these components

[ Learn More ]
There may be some components 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%\Windows Update\B1B022Fa.exe
  • %User Temp%\ADC5Bb31b3CDd012.txt
  • %User Startup%\B1B022Fa.lnk
  • %User Profile%\Chrome\manifest.json
  • %User Profile%\Chrome\jquery.min.js
  • %User Profile%\Chrome\background.js

Step 3

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Profile%\Windows Update
  • %User Profile%\Application Data\Chrome

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANLOAD.EKDW. 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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