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BKDR_ANDROM.YYSMNC

May 06, 2017
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

Backdoor.Win32.Androm.mzok (Kaspersky), Trojan:Win32/Skeeyah.A!rfn (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


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.

It connects to a website to send and receive information.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size:

1,043,968 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

29 Apr 2017

Payload:

Connects to URLs/IPs

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.

Installation

This Backdoor drops the following copies of itself into the affected system and executes them:

  • %User Profile%\AppData\Roaming\eqhpax.exe

(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.)

It adds the following processes:

  • explorer.exe

It injects codes into the following process(es):

  • explorer.exe

Autostart Technique

This Backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Application = "%User Profile%\AppData\Roaming\eqhpax.exe"

Backdoor Routine

This Backdoor connects to the following websites to send and receive information:

  • http://{malware domain}/gate.php
      where {malware domain} can be any of the following:
    • {BLOCKED}goman.com
    • {BLOCKED}atafcs.com
    • {BLOCKED}zhen.com

Download Routine

This Backdoor connects to the following URL(s) to download its component file(s):

  • http://{malware domain}/plugin/index.php?plugin=browser
  • http://{malware domain}/plugin/index.php?plugin=email
  • http://{malware domain}/plugin/index.php?plugin=ftp
  • http://{malware domain}/plugin/index.php?plugin=software
  • http://{malware domain}/plugin/index.php?plugin=games
  • http://{malware domain}/plugin/index.php?plugin=cuda
  • http://{malware domain}/plugin/index.php?plugin=minerd
  • http://{malware domain}/plugin/index.php?plugin=sgminer
  • http://{malware domain}/plugin/index.php?plugin=socks
  • http://{malware domain}/plugin/index.php?plugin=tor.onion.city

It saves the files it downloads using the following names:

  • %User Profile%\AppData\Roaming\ugdzeeveug_sf.dat (software plugin)
  • %User Profile%\AppData\Roaming\ugdzeeveug_ge.dat (games plugin)
  • %User Profile%\AppData\Roaming\ugdzeeveug_cda.dat (cuda plugin)
  • %User Profile%\AppData\Roaming\ugdzeeveug_mrd.dat (minerd plugin)
  • %User Profile%\AppData\Roaming\ugdzeeveug_sgm.dat (sgminer plugin)
  • %User Profile%\AppData\Roaming\ugdzeeveug_sck.dat (socks plugin)
  • %User Profile%\AppData\Roaming\ugdzeeveug_tor.dat (tor plugin)
  • %User Profile%\AppData\Roaming\ugdzeeveug_br.dat (browser plugin)
  • %User Profile%\AppData\Roaming\ugdzeeveug_el.dat (email plugin)
  • %User Profile%\AppData\Roaming\ugdzeeveug_ftp.dat (ftp plugin)

(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.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Backdoor connects to the following URL(s) to get the affected system's IP address:

  • http://ip.anysrc.net/plain/clientip
  • http://www.whatsmyip.website/api/api-info
  • https://api.ipify.org/?format=text
  • http://myexternalip.com/raw

It does the following:

  • Get system information
  • Get OS version
  • Get installed Antivirus products
  • Get installed Firewall products
  • Log keystrokes
  • Perform DDOS attacks
  • Install plugins
  • Monitor browsing activities
  • Start a bitcoin miner (minerd, sgminer, cuda)
  • Get games license key
  • Download and execute files

It gathers the following information and reports it to its servers:

  • Username
  • OS version
  • RAM Information
  • CPU Information
  • Volumn Information
  • Malware installation path
  • Malware version
  • Default Browser

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.370.06

FIRST VSAPI PATTERN DATE:

29 Apr 2017

VSAPI OPR PATTERN File:

13.371.00

VSAPI OPR PATTERN Date:

30 Apr 2017

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

Identify and terminate files detected as BKDR_ANDROM.YYSMNC

[ 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 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Application = "%User Profile%\AppData\Roaming\eqhpax.exe"

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.
%User Profile%\AppData\Roaming\ugdzeeveug_br.dat
%User Profile%\AppData\Roaming\ugdzeeveug_el.dat
%User Profile%\AppData\Roaming\ugdzeeveug_ftp.dat
%User Profile%\AppData\Roaming\ugdzeeveug_sf.dat
%User Profile%\AppData\Roaming\ugdzeeveug_ge.dat
%User Profile%\AppData\Roaming\ugdzeeveug_cda.dat
%User Profile%\AppData\Roaming\ugdzeeveug_mrd.dat
%User Profile%\AppData\Roaming\ugdzeeveug_sgm.dat
%User Profile%\AppData\Roaming\ugdzeeveug_sck.dat
%User Profile%\AppData\Roaming\ugdzeeveug_tor.dat

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_ANDROM.YYSMNC. 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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