➔
search
✕

TROJ_YAKES.KIV

October 09, 2012
 Analysis by: Karl Dominguez
 Modified by: Erika Bianca Mendoza
 ALIASES:

Trojan.Win32.Yakes.kjs (Kaspersky)

 PLATFORM:

Windows 2000, Windows, XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

47,616 bytes

Memory Resident:

Yes

Initial Samples Received Date:

23 Nov 2011

Payload:

Downloads files

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:

  • %System Root%\Documents and Settings\All Users\Local Settings\Temp\{random}.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
55011 = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\{random}.exe"

Other Details

This Trojan connects to the following website to send and receive information:

  • http://www.{BLOCKED}s.net/foro/image.php
  • http://www.{BLOCKED}1e.net/foro/image.php
  • http://www.{BLOCKED}ell.net/foro/image.php
  • http://www.{BLOCKED}dman.net/foro/image.php

NOTES:

Depending on the server's reply, it may download files from other sites such as:

  • http://www.{BLOCKED}rvices.com/byxyxy.exe - detected by Trend Micro as TSPY_SPYEYE.SIE
  • http://www.{BLOCKED}ervices.com/readmex.txt - corrupted file

It then executes the downloaded file, thus the malicious routines of the malware are also exhibited in the system.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.600.03

FIRST VSAPI PATTERN DATE:

23 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

Remove malware files dropped/downloaded by TROJ_YAKES.KIV

     TSPY_SPYEYE.SIE

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
    • 55011 = %System Root%\Documents and Settings\All Users\Local Settings\Temp\{random}.exe

Step 5

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

NOTES:

RECOMMENDATIONS

This malware is detected and removed by the latest Trend Micro anti-malware engine and pattern. Always keep pattern files and engines up-to-date. To know more about updating your Trend Micro product's pattern, please refer to the following Trend Micro support page:


Note: The steps apply for specific products indicated in the page.

To actively detect and protect your machine, enable real-time scanning of your Trend Micro anti-malware product. Refer to the following Trend Micro support page to know more about enabling real-time scanning in your Trend Micro product:

To enable Firewall to protect against threats: How do I enable or disable the Personal Firewall of Trend Micro Internet Security?

  • Avoid accessing the listed malicious URLs to prevent possible re-infection.
  • Monitor network connections for any suspicious connection or connectivity.
  • Regularly update list of sites that are trusted.
  • Delete files in the %User Temp% folder.
  • Block malware related websites.
  • Avoid visiting un-trusted sites that may redirect or download malware into the system.
  • Be aware of social engineering attacks to be safe.


Did this description help? Tell us how we did.