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TROJ_CDOWN.A

January 21, 2013
 Analysis by: Adrianne Chester Camat
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

40,400 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

28 Dec 2012

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Installation

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

  • %User Profile%\{random characters}.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 injects threads into the following normal process(es):

  • SVCHOST.EXE

Autostart Technique

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

HKCU\Software\Microsoft\
Windows\CurrentVersion\Run
{random characters} = %User Profile%\{random characters}.exe

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}p.com
  • {BLOCKED}l.com
  • {BLOCKED}995.com
  • {BLOCKED}endlease.com
  • {BLOCKED}t.com
  • {BLOCKED}ternet.com
  • {BLOCKED}dsl.de
  • {BLOCKED}e.it
  • {BLOCKED}eam.net
  • amazon.com
  • {BLOCKED}l.com.com
  • {BLOCKED}venue.com
  • {BLOCKED}ney.com
  • {BLOCKED}tfurniture.com
  • {BLOCKED}bendcable.com
  • {BLOCKED}i.net
  • {BLOCKED}ilders.com
  • {BLOCKED}world.com
  • bumbleandbumble.com
  • {BLOCKED}ynx.com
  • {BLOCKED}d.net
  • {BLOCKED}il.com
  • {BLOCKED}-systems.com
  • {BLOCKED}ytel.net
  • {BLOCKED}l.rr.com
  • {BLOCKED}r.net
  • {BLOCKED}ll.org
  • {BLOCKED}nsys.com
  • {BLOCKED}s.com
  • {BLOCKED}d.com.ar
  • {BLOCKED}ville.com
  • {BLOCKED}ic.com
  • {BLOCKED}.net.nz
  • {BLOCKED}h.edu
  • cnet.com
  • {BLOCKED}t.net
  • {BLOCKED}eclub.com
  • colorado.edu
  • comcast.com
  • {BLOCKED}p.com
  • {BLOCKED}tions-etc.net
  • {BLOCKED}ton.edu
  • {BLOCKED}aths.net
  • {BLOCKED}t.dk
  • {BLOCKED}a.com
  • {BLOCKED}te.com
  • {BLOCKED}r.bg
  • {BLOCKED}iz.com
  • {BLOCKED}l.com
  • {BLOCKED}h.com
  • {BLOCKED}d.jp
  • earthlink.net
  • {BLOCKED}m.net
  • {BLOCKED}sn.com
  • {BLOCKED}mail.com
  • {BLOCKED}l.cl
  • {BLOCKED}ille.net
  • {BLOCKED}c.edu
  • {BLOCKED}.co.jp
  • {BLOCKED}e.com
  • {BLOCKED}t.net
  • {BLOCKED}m.dk
  • {BLOCKED}inriver.net
  • {BLOCKED}crossing.com
  • {BLOCKED}r.com
  • {BLOCKED}yboard.com
  • {BLOCKED}ippo.com
  • {BLOCKED}i.rr.com
  • health.com
  • {BLOCKED}ail.com
  • {BLOCKED}do-this.com
  • {BLOCKED}sville.net
  • {BLOCKED}e.com
  • {BLOCKED}il.com
  • {BLOCKED}p.net
  • {BLOCKED}c.com
  • hustler.com
  • {BLOCKED}a.{BLOCKED}m.net
  • {BLOCKED}a.pl
  • {BLOCKED}l.it
  • {BLOCKED}s.com.au
  • {BLOCKED}lth.org
  • {BLOCKED}o.net
  • {BLOCKED}u.edu
  • {BLOCKED}g.net
  • {BLOCKED}ing.edu
  • {BLOCKED}y.net
  • {BLOCKED}a.com
  • {BLOCKED}wnecollege.com
  • {BLOCKED}w.com
  • {BLOCKED}a.com
  • {BLOCKED}o.it
  • {BLOCKED}e.net
  • {BLOCKED}e.com
  • {BLOCKED}ish.com
  • {BLOCKED}d.com
  • mail.com
  • {BLOCKED}ell.com
  • {BLOCKED}t.com
  • {BLOCKED}a.com
  • {BLOCKED}i.com
  • {BLOCKED}o.com
  • {BLOCKED}s.com
  • {BLOCKED}tors.com
  • msn.com
  • mtv.com
  • {BLOCKED}t.com
  • {BLOCKED}e.net.au
  • {BLOCKED}kdf.com
  • {BLOCKED}u.edu
  • {BLOCKED}.com
  • {BLOCKED}d.org
  • {BLOCKED}.ie
  • {BLOCKED}ine.net
  • {BLOCKED}cay.{BLOCKED}o.bz
  • {BLOCKED}n.com
  • {BLOCKED}.{BLOCKED}or.com
  • {BLOCKED}ech.com
  • {BLOCKED}a.com
  • {BLOCKED}inmitsubishi.com
  • {BLOCKED}online.com.au
  • {BLOCKED}w.com
  • {BLOCKED}t.lu
  • {BLOCKED}r.com
  • {BLOCKED}ds.edu
  • {BLOCKED}c.com
  • {BLOCKED}ner.com
  • {BLOCKED}k.com
  • {BLOCKED}e.com
  • {BLOCKED}ine.de
  • {BLOCKED}sports.com
  • sky.com
  • {BLOCKED}t.be
  • {BLOCKED}sol.dk
  • {BLOCKED}y.se
  • {BLOCKED}d.com
  • {BLOCKED}u.edu
  • {BLOCKED}et.net
  • {BLOCKED}obal.net
  • {BLOCKED}m.net
  • {BLOCKED}ne.de
  • {BLOCKED}lk.net
  • {BLOCKED}.uwa.edu.au
  • {BLOCKED}r.com
  • {BLOCKED}t.com
  • {BLOCKED}imcute.com
  • {BLOCKED}t.org
  • {BLOCKED}i.it
  • {BLOCKED}nott.com
  • uncc.edu
  • {BLOCKED}et.com
  • {BLOCKED}efreaks.com
  • {BLOCKED}e.com
  • verizonwireless.com
  • {BLOCKED}t.com.mx
  • {BLOCKED}w.com
  • vodafone.com
  • {BLOCKED}ne.nl
  • {BLOCKED}tream.com
  • {BLOCKED}a.fr
  • {BLOCKED}y.cz
  • {BLOCKED}d.com
  • {BLOCKED}n.com
  • {BLOCKED}ream.net
  • {BLOCKED}olutions.net
  • {BLOCKED}net.co.nz
  • {BLOCKED}etatt.net
  • {BLOCKED}nline.co.uk
  • yahoo.com.tw
  • yahoo.dk
  • yahoo.hk
  • {BLOCKED}nebox.com

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.622.04

FIRST VSAPI PATTERN DATE:

28 Dec 2012

VSAPI OPR PATTERN File:

9.623.00

VSAPI OPR PATTERN Date:

29 Dec 2012

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

Scan your computer with your Trend Micro product and note files detected as TROJ_CDOWN.A

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
    • {random characters} = %User Profile%\{random characters}.exe

Step 5

Search and delete the file detected as TROJ_CDOWN.A

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_CDOWN.A. 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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