TROJ_DELIVER.AH

October 09, 2012
 Analysis by: MarfelTi
 ALIASES:

Microsoft: TrojanDownloader:Win32/Chepvil.N; Kaspersky: Trojan-Downloader.Win32.Deliver.ll

 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

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.

It connects to a website to send and receive information.

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:

29,696 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

21 Aug 2011

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.

Backdoor Routine

This Trojan connects to the following websites to send and receive information:

  • http://sfkdhjnsfjg.ru/ftp/g.php

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}nsfjg.ru/pusk3.exe
  • http://{BLOCKED}dfjnf.ru/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:

9.200

FIRST VSAPI PATTERN FILE:

8.369.01

FIRST VSAPI PATTERN DATE:

21 Aug 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 these files

[ 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

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_DELIVER.AH. 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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