BKDR_PUSHDO.MV

 Analysis by: Michael Jay Villanueva

 ALIASES:

TrojanDropper:Win32/Cutwail (Microsoft); Backdoor.Win32.Kasidet.dzy (Kaspersky); Win32/Wigon.PH (ESET-NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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 may be dropped by other malware.

It does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

291,969 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

15 Jul 2016

Payload:

Connects to URLs/IPs, Compromises system security

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.

It may be dropped by the following malware:

  • TSPY_BEBLOH.AAACT

Installation

This backdoor drops the following copies of itself into the affected system:

  • %User Profile%\femjannacafe.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 mutexes to ensure that only one of its copies runs at any one time:

  • femjannacafe

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
femjannacafe = %User Profile%\femjannacafe.exe

Other System Modifications

This backdoor adds the following registry keys:

HKEY_USERS\{random}

It adds the following registry entries:

HKEY_CURRENT_USER
femjannacafe = {Hex Values}

HKEY_USERS\{random}
femjannacafe = {Hex Values}

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Download and execute arbitrary files
  • Retrieve Spam Configuration/Content
  • Get OS Version
  • Get System Information
  • Get Network Information

It connects to the following websites to send and receive information:

  • http://{random generated domain}.kz
    Note: it does the DGA routine when initial hardcoded C&C is inaccessible
  • http://www.{BLOCKED}s.com

Other Details

This backdoor does the following:

  • It performs random POST Request connection to the following URLs to mask network traffic and hide the C&C communication.
    • kernsafe.com
    • ottospm.com
    • ex-olive.com
    • jroy.net
    • iamdirt.com
    • stnic.co.uk
    • depalo.com
    • sclover3.com
    • x0c.com
    • netcr.com
    • dgmna.com
    • mobilnic.net
    • pwd.org
    • cel-cpa.com
    • dayvo.com
    • medisa.info
    • koz1.net
    • vexcom.com
    • yoruksut.com
    • spanesi.com
    • jenco.co.uk
    • speelhal.net
    • valselit.com
    • t-tre.com
    • transsib.com
    • cokocoko.com
    • otena.com
    • owsports.ca
    • yocinc.org
    • tvtools.fi
    • snugpak.com
    • ora.ecnet.jp
    • nelipak.nl
    • h-f.net
    • baijaku.com
    • wkhk.net
    • pb-games.com
    • nunomira.com
    • edimart.hu
    • fcwcvt.org
    • c9dd.com
    • 2print.com
    • wifi4all.nl
    • elpro.si
    • gpthink.com
    • stajum.com
    • valdal.com
    • naoi-a.com
    • pcgrate.com
    • tc17.com
    • crcsi.org
    • maktraxx.com
    • yumgiskor.kz
    • olras.com
    • myropcb.com
    • waldi.pl
    • abart.pl
    • ftchat.com
    • pohlfood.com
    • ka-mo-me.com
    • 11tochi.net
    • rs-ag.com
    • item-pr.com
    • jacomfg.com
    • medius.si
    • photo4b.com
    • findbc.com
    • fnw.us
    • abdg.com
    • railbook.net
    • reglera.com
    • udesign.biz
    • domon.com
    • alteor.cl
    • pupi.cz
    • usadig.com
    • sjbs.org
    • petsfan.com
    • fnsds.org
    • quadlock.com
    • jchysk.com
    • fink.com
    • {BLOCKED}du.com
    • vazir.se
    • synetik.net
    • hummer.hu
    • credo.edu.pl
    • aevga.com
    • pdqhomes.com
    • wnsavoy.com
    • ora-ito.com
    • evcpa.com
    • pr-park.com
    • fe-bauer.de
    • holleman.us
    • xaicom.es
    • nqks.com
    • mqs.com.br
    • lrsuk.com
  • Perform spam-bot routine based from SPAM configuration received from C&C communication
    • create svchost.exe process
    • inject code and configuration to created svchost.exe

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.654.04

FIRST VSAPI PATTERN DATE:

15 Jul 2016

VSAPI OPR PATTERN File:

12.655.00

VSAPI OPR PATTERN Date:

16 Jul 2016

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

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
    • femjannacafe = %User Profile%\femjannacafe.exe
  • In HKEY_CURRENT_USER
    • femjannacafe = {Hex Values}
  • In HKEY_USERS\{random}
    • femjannacafe = {Hex Values}

Step 5

The following created files/folders/registry keys/registry entries cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present system information with a backup. Note that the said components do not have to be deleted since it won't be harmful to the system.

  • HKEY_USERS\{random}

Step 6

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

Step 7

Scan your computer with your Trend Micro product to delete files detected as BKDR_PUSHDO.MV. 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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