Modified by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This file infector may be downloaded by other malware/grayware/spyware from remote sites. It may be manually installed by a user.

It infects by appending its code to target host files.

  TECHNICAL DETAILS

File Size: Varies
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 14 Nov 2007

Arrival Details

This file infector may be downloaded by other malware/grayware/spyware from remote sites.

It may be manually installed by a user.

File Infection

This file infector infects the following file types:

  • .EXE
  • .SCR

It infects by appending its code to target host files.

It avoids infecting files that contain the following strings in their names:

  • WC32
  • WCUN
  • WINC
  • PSTO

Other Details

This file infector does the following:

  • Listens to varying ports and attempts to connect to Internet Relay Chat (IRC) server, where it joins a certain channel. Once connected, it may allow a remote user to download and execute files remotely onto the affected system. This routine effectively compromises the affected system's security.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 04.824.12
VSAPI PATTERN Date: 14 Nov 2007
VSAPI PATTERN Date: 11/14/2007 12:00:00 AM

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

Terminate a process file/s detected as PE_VIRUT.AT

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 3

Scan your computer with your Trend Micro product to delete files detected as PE_VIRUT.AT. 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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