Social Networks Follow us on Twitter Like us on Facebook You Tube Channel
Threat Encyclopedia Mobile Page
Quick Links
  • Save & Share
  • Export page to PDF
  • Choose your country:
TROJ_CUTWAIL.KH
Aliases: TrojanDownloader:Win32/Cutwail.BS (Microsoft), W32/EncPk.CWP!tr (Fortinet), Trojan-Spy.Win32.Zbot (Ikarus)
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows XP, Windows Server 2003
In the wild: Yes

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


File size: 76,647 bytes
File type: EXE
Memory resident: Yes

Arrival Details

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

  • %User Profile%\dogzekesupwy.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

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
dogzekesupwy = "%User Profile%\dogzekesupwy.exe"

Other System Modifications

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
AppManagement = "{random value}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
dogzekesupwyzap = "{random value}"

NOTES:

It attempts to access the following websites:

  • http://3dup.com
  • http://access995.com
  • http://accountant.com
  • http://air-internet.com
  • http://alice-dsl.de
  • http://alice.it
  • http://alumni.ubc.ca
  • http://amazon.com
  • http://aol.com
  • http://apollo.lv
  • http://atkearney.com
  • http://backaviation.com
  • http://beeone.de
  • http://bell.ca
  • http://bendcable.com
  • http://bluelight.com
  • http://bluewin.ch
  • http://boardermail.com
  • http://bresnan.net
  • http://buffalo.edu
  • http://bumbleandbumble.com
  • http://caionline.org
  • http://care2.com
  • http://chat4all.org
  • http://chickensys.com
  • http://ciudad.com.ar
  • http://clear.net.nz
  • http://cmich.edu
  • http://coastalnow.net
  • http://collegeclub.com
  • http://comcast.com
  • http://comp.com
  • http://comporium.net
  • http://conwaycorp.net
  • http://cox.com
  • http://cox.net
  • http://croeso.com
  • http://cwnet.com
  • http://cybertron.com
  • http://dadlnet.dk
  • http://dir.bg
  • http://directtv.com
  • http://doctor.com
  • http://earthlink.com
  • http://eastlink.ca
  • http://email.msn.com
  • http://embarqmail.com
  • http://eresmas.com
  • http://excite.co.jp
  • http://excite.co.uk
  • http://expn.com
  • http://fedex.com
  • http://flemingc.on.ca
  • http://fluor.com
  • http://frys.com
  • http://gatespeed.com
  • http://gci.net
  • http://globalcrossing.com
  • http://gmx.net
  • http://grandecom.net
  • http://happyhippo.com
  • http://honey-do-this.com
  • http://hotmale.com
  • http://idea.com
  • http://ig.com.br
  • http://iies.es
  • http://infoseek.jp
  • http://irenu.net
  • http://job-index.ch
  • http://jotmail.com
  • http://jrihealth.org
  • http://juno.com
  • http://karoo.co.uk
  • http://kcrr.com
  • http://kettering.edu
  • http://kw.com
  • http://laposte.net
  • http://lawyer.com
  • http://lcvcpa.com
  • http://mail.earthlink.net
  • http://mailshell.com
  • http://marchmail.com
  • http://mckessonhboc.com
  • http://micron.net
  • http://mix947.com
  • http://mountainmax.net
  • http://msu.edu
  • http://naver.com
  • http://netpower.no
  • http://netsync.net
  • http://nfp.com
  • http://nifty.com
  • http://nsatel.net
  • http://oakwood.org
  • http://ohsu.edu
  • http://onebox.com
  • http://opotonline.net
  • http://orst.edu
  • http://pandora.be
  • http://pogomedias.com
  • http://proftools.lt
  • http://quixnet.net
  • http://reactionsearch.com
  • http://rediffmail.com
  • http://rockford.edu
  • http://rogers.com
  • http://sandiegoinsider.com
  • http://sbg.at
  • http://sgi.net
  • http://sify.com
  • http://soccer.com
  • http://sol.dk
  • http://spin.com
  • http://starpower.net
  • http://su.edu
  • http://surewest.net
  • http://suscom.net
  • http://sympatico.com
  • http://t-mobel.com
  • http://talktalk.net
  • http://tampabay.rr.com
  • http://tds.net
  • http://terra.com
  • http://terra.com.br
  • http://terra.es
  • http://tigers-net.com
  • http://tiscali.co.uk
  • http://tiscali.it
  • http://todito.com
  • http://uafortsmith.edu
  • http://ukr.net
  • http://univision.com
  • http://uos.net
  • http://usfilter.com
  • http://uwsp.edu
  • http://valornet.com
  • http://vampirefreaks.com
  • http://verizon.net
  • http://verizonwireless.com
  • http://vodafone.com
  • http://voicestream.com
  • http://wagged.com
  • http://walmart.com
  • http://wanadoo.es
  • http://whitbreadhotels.com
  • http://wildfun.com
  • http://willinet.net
  • http://windstream.net
  • http://worldnetatt.net
  • http://worldonline.co.uk
  • http://www.download.windowsupdate.com
  • http://yahoo.co.jp
  • http://yahoo.com.cn
  • http://yahoo.com.hk
  • http://yahoo.hk
  • http://yahoo.no
  • http://yatroo.com
  • http://zdnetonebox.com

Minimum scan engine: 9.300
First VSAPI Pattern File: 9.466.05
VSAPI OPR Pattern Version: 9.467.00

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

Restart in Safe Mode

Step 3

Delete this registry value

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
    • dogzekesupwy = "%User Profile%\dogzekesupwy.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • AppManagement = "{random value}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • dogzekesupwyzap = "{random value}"

Step 4

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


Did this description help? Tell us how we did.
Analysis By: Jaime Benigno Reyes