TROJ_HOSTER.F

October 09, 2012
 Analysis by: Sabrina Lei Sioting
 Modified by: Cris Nowell Pantanilla
 PLATFORM:

Windows 2000, Windows XP, Windows 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 arrives as a component bundled with malware/grayware packages.

It is a component of other malware.

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

  TECHNICAL DETAILS

File Size:

4,287 bytes

File Type:

Java Class

Initial Samples Received Date:

13 Sep 2009

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

Installation

This Trojan is a component of other malware.

HOSTS File Modification

This Trojan adds the following strings to the Windows HOSTS file:

  • {BLOCKED}.{BLOCKED}.114.180 santander.com.br
  • {BLOCKED}.{BLOCKED}.114.180 www.santander.com.br
  • {BLOCKED}.{BLOCKED}.114.181 itau.com.br
  • {BLOCKED}.{BLOCKED}.114.181 www.itau.com.br
  • {BLOCKED}.{BLOCKED}.114.181 www.itau.com
  • {BLOCKED}.{BLOCKED}.114.181 itau.com
  • {BLOCKED}.{BLOCKED}.114.181 itaupersonnalite.com.br
  • {BLOCKED}.{BLOCKED}.114.181 www.itaupersonnalite.com.br
  • {BLOCKED}.{BLOCKED}.114.182 www.bradesco.com.br
  • {BLOCKED}.{BLOCKED}.114.182 bradesco.com.br
  • {BLOCKED}.{BLOCKED}.114.182 www.bradesco.com
  • {BLOCKED}.{BLOCKED}.114.182 bradesco.com
  • {BLOCKED}.{BLOCKED}.114.182 www.bradescoempresa.com.br
  • {BLOCKED}.{BLOCKED}.114.182 bradescoempresa.com.br
  • {BLOCKED}.{BLOCKED}.114.182 www.bradescoprime.com.br
  • {BLOCKED}.{BLOCKED}.114.182 bradescoprime.com.br
  • {BLOCKED}.{BLOCKED}.114.182 bradescocartoes.com.br
  • {BLOCKED}.{BLOCKED}.114.182 www.bradescocartoes.com.br
  • {BLOCKED}.{BLOCKED}.114.179 www.nossacaixa.com.br
  • {BLOCKED}.{BLOCKED}.114.179 nossacaixa.com.br

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}s.io.{BLOCKED}p.br/tikiwiki/img/wiki/dedi/mais.php

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

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

6.436.06

FIRST VSAPI PATTERN DATE:

13 Sep 2009

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

Remove these strings added by the malware/grayware/spyware in the HOSTS file

[ Learn More ]
    • {BLOCKED}.{BLOCKED}.114.180 santander.com.br
    • {BLOCKED}.{BLOCKED}.114.180 www.santander.com.br
    • {BLOCKED}.{BLOCKED}.114.181 itau.com.br
    • {BLOCKED}.{BLOCKED}.114.181 www.itau.com.br
    • {BLOCKED}.{BLOCKED}.114.181 www.itau.com
    • {BLOCKED}.{BLOCKED}.114.181 itau.com
    • {BLOCKED}.{BLOCKED}.114.181 itaupersonnalite.com.br
    • {BLOCKED}.{BLOCKED}.114.181 www.itaupersonnalite.com.br
    • {BLOCKED}.{BLOCKED}.114.182 www.bradesco.com.br
    • {BLOCKED}.{BLOCKED}.114.182 bradesco.com.br
    • {BLOCKED}.{BLOCKED}.114.182 www.bradesco.com
    • {BLOCKED}.{BLOCKED}.114.182 bradesco.com
    • {BLOCKED}.{BLOCKED}.114.182 www.bradescoempresa.com.br
    • {BLOCKED}.{BLOCKED}.114.182 bradescoempresa.com.br
    • {BLOCKED}.{BLOCKED}.114.182 www.bradescoprime.com.br
    • {BLOCKED}.{BLOCKED}.114.182 bradescoprime.com.br
    • {BLOCKED}.{BLOCKED}.114.182 bradescocartoes.com.br
    • {BLOCKED}.{BLOCKED}.114.182 www.bradescocartoes.com.br
    • {BLOCKED}.{BLOCKED}.114.179 www.nossacaixa.com.br
    • {BLOCKED}.{BLOCKED}.114.179 nossacaixa.com.br
"

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_HOSTER.F. 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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