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TROJ_DLOAD.KKN

October 09, 2012
 Analysis by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


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

It uses common file icons to trick a user into thinking that the files are legitimate.

  TECHNICAL DETAILS

File Size:

73,728 bytes

File Compression:

UPX

Memory Resident:

Yes

Initial Samples Received Date:

08 Nov 2011

Payload:

Steals information

Arrival Details

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

Installation

This Trojan drops the following files:

  • %User Temp%\ld_done1

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It uses common file icons to trick a user into thinking that the files are legitimate.

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

  • lh48H1mksHs

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft
ld_done1 = {dword value}

NOTES:

It connects to the following malicious URL to send encrypted system information and to download other files:

  • {random}.pohuy.ws

The system information sent are as follows:

  • active windows
  • activex
  • adapter information
  • BHO list
  • computer name
  • country
  • drive information / disk space
  • explorer history
  • file list
  • hosts file contents
  • IE extensions
  • internet explorer version
  • keyboard type
  • OS version
  • processes
  • processor information
  • proxy
  • RAS connection
  • registry keys
  • running antivirus application
  • screen information (resolution, colors, etc.)
  • sofware list
  • time zone
  • user name
  • virtual environment

It checks for the existence of the following processes related to anti-virus:

  • ashMaiSv.exe
  • ashServ.exe
  • AVENGINE.EXE
  • avgamsvr.exe
  • avgcc.exe
  • avgupsvc.exe
  • avp.exe
  • bdnagent.exe
  • bdss.exe
  • CAVRID.exe
  • DefWatch.exe
  • F-Sched.exe
  • FP-Win.exe
  • fpavupdm.exe
  • fsav32.exe
  • fsgk32st.exe
  • fssm32.exe
  • ISafe.exe
  • kav.exe
  • kavsvc.exe
  • MpfAgent.exe
  • MpfService.exe
  • MskAgent.exe
  • MSKSrvr.exe
  • navapsvc.exe
  • nod32krn.exe
  • nod32kui.exe
  • Pavkre.exe
  • pavprsrv.exe
  • pavsrv51.exe
  • PCCClient.exe
  • pccguide.exe
  • prevsrv.exe
  • Rtvscan.exe
  • Tmntsrv.exe
  • VetMsg.exe
  • vptray.exe

It also checks the date and time by accessing the following non-malicious URLs:

  • 0.pool.ntp.org
  • 1.pool.ntp.org
  • 2.pool.ntp.org
  • google.com
  • linux.org
  • microsoft.com
  • pool.ntp.org
  • yahoo.com

When a connection to the above-mentioned malicious URL is established, it listens to TCP port 10100 to possibly download other files onto the system. However, the URL currently does not respond properly.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.564.02

FIRST VSAPI PATTERN DATE:

10 Nov 2011

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

Identify and terminate files detected as TROJ_DLOAD.KKN

[ Learn More ]
  1. 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.
  2. 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
    • ld_done1 = {dword value}

Step 4

Search and delete this file

[ Learn More ]
There may be some component 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 Temp%\ld_done1

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOAD.KKN. 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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