TROJ_GYPIKON.EV


 ALIASES:

Trojan:Win32/Sisron (Microsoft), Trojan-Downloader.Win32.Delf.wwk (Kaspersky)

 PLATFORM:

Windows

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

  • 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.

  TECHNICAL DETAILS

File Size:

260,608 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

30 Jun 2009

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.

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
windowslive = "{malware path and filename}"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\windowslive

It adds the following registry entries:

HKEY_CURRENT_USER\Software\windowslive
installinfo = "1"

HKEY_CURRENT_USER\Software\windowslive
day = "{installation date}"

Download Routine

This Trojan saves the files it downloads using the following names:

  • {malware path}:\windowslive.sys

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}e.co.kr/download/windowslive/windowslive.sys
  • {BLOCKED}.{BLOCKED}.112.169/count_log/log/boot.php?p={malware name}&m={mac address}

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

6.240.05

FIRST VSAPI PATTERN DATE:

30 Jun 2009

VSAPI OPR PATTERN File:

6.241.00

VSAPI OPR PATTERN Date:

30 Jun 2009

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

Restart in Safe Mode

[ Learn More ]

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\windowslive
    • installinfo = "1"
  • In HKEY_CURRENT_USER\Software\windowslive
    • day = "{installation date}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • windowslive = "{malware path and filename}"

Step 4

Delete this registry key

[ 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
    • windowslive

Step 5

Search and delete these files

[ Learn More ]
There may be some 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.
  • {malware path}:\windowslive.sys

Step 6

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