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BKDR_EMDIVI.YC

November 21, 2014
 Modified by: RonJay Kristoffer Caragay
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This backdoor 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:

210,944 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Nov 2014

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Dropping Routine

This backdoor drops the following files:

  • %Common Startup%\{malware file name}.lnk
  • %User Startup%\{malware file name}.lnk

(Note: %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.. %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 backdoor connects to the following URL(s) to check for an Internet connection:

  • http://www.microsoft.com
  • http://www.msftncsi.com
  • http://www.yahoo.co.jp

It connects to the following possibly malicious URL:

  • http://www.{BLOCKED}forest.jp/event/index.php
  • http://www.{BLOCKED}f.org.hk/FrNghomily/wp-content/upgrade/index.php

NOTES:

For Windows Vista\7\8\8.1\Server 2008\2012, the malware drops the following:

  • %Common Startup% - C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup
  • %User Startup% - C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.260.04

FIRST VSAPI PATTERN DATE:

06 Nov 2014

VSAPI OPR PATTERN File:

11.261.00

VSAPI OPR PATTERN Date:

07 Nov 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

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

Restart in Safe Mode

[ Learn More ]

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.
  • %Common Startup%\{malware file name}.lnk
  • %User Startup%\{malware file name}.lnk

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_EMDIVI.YC. 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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