Analysis by: Oscar Celestino Angelo Abendan ll
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This description is based on a compiled analysis of several variants of TROJ_CHEPVIL. Note that specific data such as file names and registry values may vary for each variant.

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. However, as of this writing, the said sites are inaccessible.

It bears the file icons of certain applications to avoid easy detection and consequent removal. It executes then deletes itself afterward.

  TECHNICAL DETAILS

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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

Installation

This Trojan bears the file icons of the following applications:

  • PDF Document

It executes then deletes itself afterward.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}llis.com/blood.exe
  • http://{BLOCKED}llis.com/ftp/g.php
  • http://{BLOCKED}dfjnf.ru/blood.exe
  • http://{BLOCKED}dfjnf.ru

NOTES:

This description is based on a compiled analysis of several variants of TROJ_CHEPVIL. Note that specific data such as file names and registry values may vary for each variant.

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 5.456.06
VSAPI OPR PATTERN Date: 06 Aug 2008

Trend customers:

    Keep your pattern and scan engine files updated. Trend Micro antivirus software can clean or remove most types of computer threats. Malware, though, such as Trojans, scripts, overwriting viruses and joke programs which are identified as uncleanable, should simply be deleted.

All Internet users:

    1. Use HouseCall - the Trend Micro online threat scanner to check for malware that may already be on your PC.
    2. Catch malware/grayware before they affect your PC or network. Secure your Web world with Trend Micro products that offer the best anti-threat and content security solutions for home users, corporate users, and ISPs. Go here for more information on Trend Micro products that fit your needs.


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