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JS_MALAGENT.PB

May 16, 2011
 Analysis 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: No

  • In the wild: Yes

  OVERVIEW

This malware is noteworthy as this is used for the Facebook spam run. When executed, it performs several actions on the user's Facebook profile.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This JavaScript performs the following actions on the user's profile:

  • Posts on Facebook wall and tags friends

  • Likes its own post

  • Comments on its own post

  • Creates an event

  • Creates a personalized Facebook chat message and supplies a link

This Trojan may arrive using one or multiple arrival methods.

It redirects browsers to certain sites.

  TECHNICAL DETAILS

File Size:

8,078 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

05 May 2011

Payload:

Steals information, Connects to URLs/IPs, Sends spammy links to the affected users' contacts

Arrival Details

This Trojan arrives via the following means:

  • It may be a posted message as part of clickjacking attacks on social sites such as Facebook.

Information Theft

This Trojan presents the user with the following series of windows in order to obtain account information:

Other Details

This Trojan redirects browsers to the following sites:

  • http://{BLOCKED}jq.{BLOCKED}vb.info//final.php
  • http://{BLOCKED}no.{BLOCKED}3j.info

NOTES:
It also performs the following actions on the user's profile:

  • Posts on Facebook wall and tags friends
  • Likes its own post
  • Comments on its own post
  • Creates an event
  • Creates a personalized Facebook chat message and supplies a link

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.138.08

FIRST VSAPI PATTERN DATE:

05 May 2011

VSAPI OPR PATTERN File:

8.139.00

VSAPI OPR PATTERN Date:

06 May 2011

Scan your computer with your Trend Micro product to delete files detected as JS_MALAGENT.PB. 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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