Analysis by: Sabrina Lei Sioting
 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

  TECHNICAL DETAILS

File Size: 323,584 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 03 Jul 2009

Installation

This Trojan adds the following folders:

  • %system root%\cleansweep.exe

It drops the following copies of itself into the affected system:

  • %system root%\cleansweep.exe\cleansweep.exe

It drops the following files:

  • %system root%\cleansweep.exe\config.bin

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
cleansweep.exe = %system root%\cleansweep.exe\cleansweep.exe

Download Routine

This Trojan downloads an updated copy of itself from the following website(s):

  • http://www.{BLOCKED}ctionsupport.org/f/bin/zam.exe

It saves the files it downloads using the following names:

  • %system root%\cleansweep.exe\cleansweepupd.exe

Stolen Information

This Trojan sends the gathered information via HTTP POST to the following URL:

  • http://www.{BLOCKED}ctionsupport.org/f/gate.php

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 07.446.07
VSAPI PATTERN Date: 08 Sep 2010
VSAPI PATTERN Date: 9/8/2010 12:00:00 AM
FIRST VSAPI PATTERN FILE: 7.342.01
FIRST VSAPI PATTERN DATE: 27 Jul 2010

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

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\Microsoft\Windows\CurrentVersion\Run
    • cleansweep.exe = %System Root%\cleansweep.exe\cleansweep.exe

Step 3

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result. %system root%\cleansweep.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_INJECT.AMW. 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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