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Threat Encyclopedia

TROJ_DLOAD.BTN

ANALYSIS BY

Jed Valderama


ALIASES:

Trojan.Win32.Jorik.Totem.vu (Kaspersky), PWS-Zbot.gen.ajf (McAfee)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

Infection Channel:

Spammed via email


This Trojan uses London Olympics 2012 as lure to users. The email message it sends tells users of a video about a scandal. Users are redirected instead to a fake YouTube page.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

TECHNICAL DETAILS

File Size:

66,048 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

04 Aug 2012

Payload:

Connects to URLs/IPs, Sends messages

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Trojan adds the following processes:

  • svchost.exe

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • "femokybhawam"

It injects itself into the following processes as part of its memory residency routine:

  • previously created svchost.exe

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
femokybhawam = "%User Profile%\femokybhawam.exe"

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
femokybhawam = "{malware code}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
AppManagement = "{hex values}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSetServices\
Tcpip\Parameters
MaxUserPort = "dword:0000FFFE"

Other Details

This Trojan attempts to access the following websites to download files, which are possibly malicious:

  • http://www.{BLOCKED}Xx.com/40E800105D592623DB4A9523B1FC5C244044B3256C00000012660000000076
    00000007EB0005305CB7315B6E00000000

NOTES:

This Trojan may compose messages that can be part of its spamming routine. The messages it sends contain the following links:

  • http://{BLOCKED}aard.nl/london.html
  • http://{BLOCKED}es.ee/wp-content/videoaudio/temp/london.html
  • http://{BLOCKED}ru.com/london.html
  • http://wittdj.{BLOCKED}aradies.info/wp-content/videoaudio/temp/london.html
  • http://www.{BLOCKED}use.com/wp-content/videoaudio/temp/london.html
  • http://www.{BLOCKED}oevergast.nl/london.html
  • http://www.{BLOCKED}on.com/temp/london.html
  • http://www.{BLOCKED}o.se/london.html

It uses any of the following Simple Mail Transfer Protocol (SMTP) servers to send its messages:

  • alt4.gmail-smtp-in.l.google.com
  • gmail-smtp-in.l.google.com
  • in1.smtp.messagingengine.com
  • mail7.digitalwaves.co.nz
  • mxs.mail.ru

It also attempts to connect to the following non-malicious sites:

  • 0-balance-transfer.com
  • 0-savings.com
  • 0a3manacor.org
  • 0avocat.ca
  • 0c0m0y0k.de
  • 0connor.com
  • 0creativity.com
  • 0ctober.com
  • 0dayguru.com
  • 0daymusic.biz
  • 0daypatch.com
  • 0degree.com
  • 0direct.info
  • 0distortion.net
  • 0divide.com
  • 0dollardomain.com
  • 0dollarmerchantaccounts.com
  • 0domainname.com
  • 0downhomemortgage.com
  • 0downhomemortgages.com
  • 0downpmt.com
  • 0downproperties.com
  • 0downtime.com
  • 0dutycigs.com
  • 0factor.com
  • 0handicap.at
  • 0kommanix.de
  • 0promotion.com
  • 0ptical.net
  • 0salvamont.ro
  • 4-debt-elimination.com
  • 4-elements.ch
  • 4-elements.se
  • 4-estateagent.com
  • 4-everandaday.com
  • 4-exports.gr
  • 4darabians.nl
  • 4dasoul.com
  • 4daysinbq.com
  • 4dbabamozi.hu
  • 4dbenelux.be
  • 4degreez.com
  • 4dmobil.at
  • 4dxgroup.com
  • 4dzsocietiez.com
  • 4e-energiezentrale.de
  • 4e-ingenieria.com
  • 4e-solutions.ch
  • 4ebooksnow.com
  • 4economics.com
  • 4ecopromotions.com
  • 4edgewater.com
  • 4educationinformation.com
  • 4eglass.com
  • 4egolifestyle.de
  • 4eigner.net
  • 4einstitute.jp
  • 4elation.com
  • 4eldoradorealestate.com
  • 4electrolysis.com
  • 4elementdesign.com
  • 4elementos.cl
  • 4elementos.es
  • 4elements.cz
  • 4elements.de-webspace.de
  • 4elements.gr
  • 4elements.net
  • 4elements.pl
  • 4elements.us
  • 4elementsaward.com
  • 4elementsinaction.com
  • 4eleven.com
  • 4emails.de
  • 4emergence.com
  • 4emotion.pl
  • 4emotions.de
  • 4emultimedia.com
  • 4enerchi.nl
  • 4energia.ee
  • 4engagementrings.com
  • 4englishexams.com
  • 4englishhotels.com
  • 4equestrian.com
  • 4ergindl.at
  • 4esnokov.ru
  • 4esport.de
  • 4esports.eu
  • 4esprit.com
  • 4essence.eu
  • 4estates.eu
  • 4estatesales.com
  • 4eternity.ch
  • 4etverg.ru
  • 4eurohouse.com
  • 4euroweb.com
  • 4evenmore.net
  • 4events.at
  • 4ever-friends.com
  • 4ever-hosting.de
  • 4everblessed.com
  • 4evercleaning.com
  • 4everdesign.com
  • 4everdreams.nl
  • 4everevents.nl
  • 4everevolving.com
  • 4everfamily.com
  • 4everfloyd.com
  • 4everfriends.net
  • 4evergifts4u.com
  • 4evergreenlawncare.com
  • 4everhomes.org
  • 4everkeepsakes.com
  • 4everlogo.com
  • 4everlost.com
  • 4evermusic.pl
  • 4evernew.com
  • 4everone.net
  • 4everphp.de
  • 4everproductions.com
  • 4everrose.com
  • 4eversoft.hu
  • 4everweb.nl
  • 4everwedding.com
  • 4every1.cc
  • 4every1.cz
  • 4everyman.com
  • 4everyone.nl
  • 4everyware.com
  • 4everywhere.com
  • 4ezdiet.com
  • 4figures.info
  • 6vrelay.com
  • 6weekstosoccermagic.com
  • 7addad-scripts.com
  • 7adharat.com
  • 8th1der.com
  • 8toinfinity.com
  • 8ung3st.de
  • 8zaamarchitecten.nl
  • 8zsmost.cz
  • 8zstabor.taborak.cz
  • 9.194.193.110.abbemae.com
  • 9ktuning.com
  • 9lupine.com
  • 9medien.de
  • 9monthproject.com
  • 9nepasa.ro
  • 9netweb.it
  • 9neunzig.de
  • 9ninehalf.com
  • 9notguilty.com
  • 9oakflooring.com
  • 9online.fr
  • 9records.com
  • 9t6grafikdesign.de
  • 9thstreetcharities.org
  • 9vad4r95bfux.sy
  • 9voltalkalinebatteries.com
  • 9voltrecords.com
  • 9volttaco.com
  • 9wallpapers.com
  • 9webhosting.net
  • 9welten.de
  • 9westjewelers.com
  • 9wishes.com
  • Running
  • WinSock 2.0
  • XNG74evernew.com
  • accordindustries.com
  • accords-bilateraux.ch
  • accordtechnologies.com
  • accountantskantoordekoning.nl
  • accountantsvirtualservices.com
  • accounting-consulting.de
  • accounting-education.com
  • accountingbusinessservice.com
  • accountingchile.com
  • accountingchum.com
  • accountingcircle.com
  • accountingformanagement.com
  • accountingmarketing.net
  • accountingsmallbusiness.net
  • accountingtechs.biz
  • hijsoft.ru
  • shanisoft.kz

This Trojan appends 30 random characters to the aforementioned sites. This may be an indication that this Trojan might use the altered sites for other purposes.

SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.310.08

FIRST VSAPI PATTERN DATE:

09 Aug 2012

VSAPI OPR PATTERN File:

9.311.00

VSAPI OPR PATTERN Date:

09 Aug 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product and note files detected as TROJ_DLOAD.BTN

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
    • femokybhawam = "%User Profile%\femokybhawam.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • femokybhawam = "{malware code}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • AppManagement = "hex values"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSetServices\Tcpip\Parameters
    • MaxUserPort = "dword:0000FFFE"

Step 5

Search and delete the file detected as TROJ_DLOAD.BTN

*Note: Some component files may be 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.


To manually delete a malware/grayware file from the affected system:

  1. Right-click Start then click Search....
  2. In the Named input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.

Step 6

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