Infostealer.Initowa

Risk Level 1: Very Low

Discovered:
May 27, 2014
Updated:
May 27, 2014 12:10:34 PM
Type:
Trojan
Infection Length:
Varies
Systems Affected:
Windows

SUMMARY

Infostealer.Initowa is a Trojan horse that redirects traffic from specific websites and steals information from the compromised computer.

Antivirus Protection Dates

  • Initial Rapid Release version May 27, 2014 revision 004
  • Latest Rapid Release version May 27, 2014 revision 005
  • Initial Daily Certified version May 27, 2014 revision 016
  • Latest Daily Certified version May 27, 2014 revision 016
  • Initial Weekly Certified release date May 28, 2014
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

TECHNICAL DETAILS

Once executed, the Trojan drops the following files:
  • %ProgramFiles%\Nril\syetom.exe
  • %Temp%\1.exe

It creates following clean file:
%Temp%\2.jpg

The Trojan creates the following registry entry so that it runs every time Windows starts:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"syetom" = "%ProgramFiles%\Nril\syetom.exe"

Next, the Trojan connects to the following URL in order to download a configuration file:
[http://]r.qzone.qq.com/cgi-bin/user/cgi_pers[REMOVED][RANDOM FILE NAME]

The configuration file contains the the following IP address:
61.202.37.132

Note: The IP address may be changed.

The Trojan then searches all drives on the compromised computer for folders with the name NPKI. If a folder with this name is found, the Trojan copies the content of the NPKI folder and sends it to the following remote location:
http://[IP ADDRESS]/upload.php

Next, the Trojan modifies the following file in order to redirect network traffic on the compromised computer:
%System%\drivers\hosts.ics


It adds the following domains to the above file:
  • bank.cu.co.kr
  • banking.dgb.co.kr
  • banking.nfcf.or.kr
  • banking.nonghyup.com
  • banking.shinhan.com
  • bonking.nonghuyp.com
  • bonking.shihan.com
  • busanbank.co.kr
  • citibank.com
  • cu.co.kr
  • daegubank.co.kr
  • daum.net
  • dgb.co.kr
  • ebank.keb.co.kr
  • epostbank.go.kr
  • hanabank.com
  • hanmail.net
  • ib.scfirstbank.com
  • ibk.co.kr
  • ibs.jbbank.co.kr
  • ibs.kfcc.co.kr
  • ibz.nonghyup.com
  • ids.kfc.co.kr
  • jbbank.co.kr
  • kbstar.com
  • kdb.co.kr
  • keb.co.kr
  • kfcc.co.kr
  • kibs.knbank.co.kr
  • kiup.ibk.co.kr
  • kjbank.com
  • knbank.co.kr
  • mybank.ibk.co.kr
  • mybonk.idk.co.kr
  • nate.com
  • naver.com
  • nfcf.or.kr
  • nonghyup.com
  • obank.kbstar.com
  • open.hanabank.com
  • open.ibk.co.kr
  • open.keb.co.kr
  • open.nonghyup.com
  • open.shinhan.com
  • pib.wooribank.com
  • scfirstbank.com
  • shinhan.com
  • suhyup-bank.com
  • u.wooribank.com
  • wooribank.com
  • www.bgd.co.kr
  • www.busanbank.co.kr
  • www.bushanbank.go.kr
  • www.chu.go.kr
  • www.citibank.com
  • www.citibonk.co.kr
  • www.cu.co.kr
  • www.daegubank.co.kr
  • www.daum.net
  • www.dgb.co.kr
  • www.epastbonk.co.kr
  • www.epostbank.co.kr
  • www.epostbank.go.kr
  • www.hanabank.com
  • www.hanabonk.com
  • www.hanmail.net
  • www.ibk.co.kr
  • www.jbbank.co.kr
  • www.kbd.co.kr
  • www.kbstar.com
  • www.kdb.co.kr
  • www.kdstor.com
  • www.keb.co.kr
  • www.ked.co.kr
  • www.kejbonk.com
  • www.kfcc.co.kr
  • www.kjbank.com
  • www.knbank.co.kr
  • www.knbbonk.co.kr
  • www.nate.com
  • www.naver.com
  • www.nfcf.or.kr
  • www.nonghyup.com
  • www.shinhan.com
  • www.standardchartered.co.kr
  • www.stndordchortereb.co.kr
  • www.suhuyp.co.kr
  • www.suhyup.co.kr
  • www.suhyup-bank.com
  • www.wooribank.com
  • www.woribonk.com
  • www.zum.com
  • zum.com

The Trojan redirects all traffic from the above domains to the IP address contained in the configuration file.

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

REMOVAL

You may have arrived at this page either because you have been alerted by your Symantec product about this risk, or you are concerned that your computer has been affected by this risk.

Before proceeding further we recommend that you run a full system scan. If that does not resolve the problem you can try one of the options available below.



FOR NORTON USERS
If you are a Norton product user, we recommend you try the following resources to remove this risk.


Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD.


How to reduce the risk of infection
The following resources provide further information and best practices to help reduce the risk of infection.


FOR BUSINESS USERS
If you are a Symantec business product user, we recommend you try the following resources to remove this risk.


Identifying and submitting suspect files
Submitting suspicious files to Symantec allows us to ensure that our protection capabilities keep up with the ever-changing threat landscape. Submitted files are analyzed by Symantec Security Response and, where necessary, updated definitions are immediately distributed through LiveUpdateâ„¢ to all Symantec end points. This ensures that other computers nearby are protected from attack. The following resources may help in identifying suspicious files for submission to Symantec.


Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD.


How to reduce the risk of infection
The following resource provides further information and best practices to help reduce the risk of infection.
Protecting your business network



MANUAL REMOVAL
The following instructions pertain to all current Symantec antivirus products.


1. Performing a full system scan
How to run a full system scan using your Symantec product


2. Restoring settings in the registry
Many risks make modifications to the registry, which could impact the functionality or performance of the compromised computer. While many of these modifications can be restored through various Windows components, it may be necessary to edit the registry. See in the Technical Details of this writeup for information about which registry keys were created or modified. Delete registry subkeys and entries created by the risk and return all modified registry entries to their previous values.