Analysis by: JessaD
ALIASES:

TrojanDownloader:Win32/Renos.MJ (Microsoft), Trojan-Downloader.Win32.CodecPack.acyr (Kaspersky) , Downloader (Symantec)

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be dropped by other malware.

It attempts to access certain websites. However, the websites are inaccessible as of this writing. It connects to certain websites to send and receive information. It terminates itself if it detects it is being run in a virtual environment.

  TECHNICAL DETAILS

File Size: 217,088 bytes
File Type: PE
Memory Resident: No
Initial Samples Received Date: 14 Jan 2011
Payload: Compromises system security

Arrival Details

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

It may be dropped by other malware.

Installation

This Trojan terminates itself if it finds the following processes in the affected system's memory:

  • Wireshark

Other Details

This Trojan attempts to access certain websites. However, the websites are inaccessible as of this writing.

It connects to the following website to send and receive information:

  • http://{BLOCKED}en.in/{random characters}.php
  • http://{BLOCKED}ero.in/{random characters}.php
  • http://{BLOCKED}online.in/{random characters}.php

It terminates itself if it detects it is being run in a virtual environment.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.766.18
VSAPI PATTERN Date: 14 Jan 2011
VSAPI PATTERN Date: 1/14/2011 12:00:00 AM

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

Scan your computer with your Trend Micro product to delete files detected as TROJ_RENOS.NRT. 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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