Modified by: JasperM
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

The reply from the said website may contain other URL where this malware can download other files.

This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites. However, as of this writing, the said sites are inaccessible.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 43,008 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 17 Jun 2010
Payload: Downloads files

Arrival Details

This Trojan may be dropped by other malware.

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

However, as of this writing, the said sites are inaccessible.

Installation

This Trojan drops the following files:

  • %System%\hyli.igo - also detected as TROJ_SASFIS.AE

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It injects itself into the following processes running in the affected system's memory:

  • SVCHOST.EXE

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT
(Default) =

It modifies the following registry key(s)/entry(ies) as part of its installation routine:

HKEY_LOCAL_MACHINE
Shell = Explorer.exe rundll32.exe hyli.igo atkhnt

(Note: The default value data of the said registry entry is Explorer.exe.)

Backdoor Routine

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

  • http://{BLOCKED}ader.ru/group/mixer/bb.php?{parameters}

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 7.251.00
VSAPI OPR PATTERN Date: 17 Jun 2010

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 delete files detected as TROJ_SASFIS.AE using either the Startup Disk or Recovery Console

[ Learn More ]

Step 3

Restore this modified 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 NT\
    CurrentVersion\Winlogon
    • From: Shell = Explorer.exe rundll32.exe fvfj.sxo trsnl
      To: Shell = Explorer.exe

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_CLASSES_ROOT\
    • idid

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_SASFIS.AE. 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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