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TROJ_CHEPVIL.BA

October 09, 2012
 ALIASES:

TrojanDownloader:Win32/Chepvil.K (Microsoft), Trojan.FakeAV (Symantec), Mal/FakeAV-LI (Sophos), Trojan-Downloader.Win32.Chepvil (Ikarus)

 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 Trojan arrives as attachment to mass-mailed email messages.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

24,576 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

14 Jun 2011

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}dov.com/pusk3.exe

It saves the files it downloads using the following names:

  • %User Temp%\pusk3.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.224.04

FIRST VSAPI PATTERN DATE:

14 Jun 2011

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

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
  • %User Temp%\pusk3.exe
  • In the Look In drop-down list, select My Computer, then press Enter.
  • Once located, select the file then press SHIFT+DELETE to permanently delete the file.

    • Step 3

    Scan your computer with your Trend Micro product to delete files detected as TROJ_CHEPVIL.BA. 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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