Analysis by: Abraham Latimer Camba
 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

Infection Channel: Dropped by other malware, Downloaded from the Internet

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 URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.

  TECHNICAL DETAILS

File Size: 113,792 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 12 Jun 2012
Payload: Connects to URLs/IPs, Sends Spammed messages

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

  • {AEAFE7C3-EF95-182C-1A45-B5B637E56D2F}

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpip\Parameters
MaxUserPort = "fffe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpip\Parameters
TcpNumConnections = "fffe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\BITS
id = "{random numbers}"

Download Routine

This Trojan connects to the following malicious URLs:

  • sec.{BLOCKED}tgame.com

NOTES:

This Trojan connects to the following malicious URL:

  • http://{BLOCKED}.{BLOCKED}.51.227/spm/s_get_host.php

It does this to report infection and retrieve information used to send spam mails.

It then sends spammed messages to email addresses using the information retrieved.

It uses the following SMTP servers when sending spam:

  • alt1.aspmx.l.google.com
  • mailin-01.mx.aol.com
  • mailin-02.mx.aol.com
  • mailin-03.mx.aol.com
  • mailin-04.mx.aol.com
  • mta5.am0.yahoodns.net
  • mta6.am0.yahoodns.net
  • mta7.am0.yahoodns.net
  • mx1.hotmail.com
  • mx2.hotmail.com
  • mx3.hotmail.com
  • mx4.hotmail.com

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.188.01
FIRST VSAPI PATTERN DATE: 12 Jun 2012
VSAPI OPR PATTERN File: 9.189.00
VSAPI OPR PATTERN Date: 13 Jun 2012

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

Scan your computer with your Trend Micro product and note files detected as TROJ_ALUREON.CZC

Step 3

Identify and terminate files detected as TROJ_ALUREON.CZC

[ 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 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\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
    • MaxUserPort = "fffe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
    • TcpNumConnections = "fffe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\BITS
    • id = "{random numbers}"

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_ALUREON.CZC. 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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