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BKDR_EMDIVI.TRYF

August 07, 2015
 Analysis by: RonJay Kristoffer Caragay
 ALIASES:

Trojan:Win32/Dynamer!ac (Microsoft); RDN/Generic Downloader.x (McAfee); Downloader.Ponik (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Agent5.ACYP (AVG)

 PLATFORM:

Windows

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

  • 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:

292,352 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

14 Jul 2015

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, and C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://www.{BLOCKED}ko-golf.com/news/index.php
  • http://www.{BLOCKED}sub.com/ec/index.php
  • http://www.{BLOCKED}norei.com/{5 random numbers}?p=#
  • http://jp.{BLOCKED}b.biz/{5 random numbers}?p=#

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.806.06

FIRST VSAPI PATTERN DATE:

22 Jul 2015

VSAPI OPR PATTERN File:

11.807.00

VSAPI OPR PATTERN Date:

23 Jul 2015

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 this file

[ 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.TRYF. 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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