Threat Encyclopedia

JS_OBFUS.VTGD

Publish date: July 02, 2014

ANALYSIS BY

Jaime Benigno Reyes


PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted:

  • In the wild: Yes

OVERVIEW


This Trojan may be hosted on a website and run when a user accesses the said website.

TECHNICAL DETAILS

File Size:

Varies

File Type:

Script

Initial Samples Received Date:

20 Jun 2014

Payload:

Runs malicious SWF files

Arrival Details

This Trojan may be hosted on a website and run when a user accesses the said website.

NOTES:

This malware is hosted on the following sites:

  • http://{BLOCKED}a.{BLOCKED}turiverzi.ro/excodec/ybeastl/oshallb.php
  • http://{BLOCKED}a.{BLOCKED}turiverzi.ro/excodec/ybeastl/gglancedh.php
  • http://{BLOCKED}a.{BLOCKED}turiverzi.ro/excodec/ybeastl/barrangedb.php

When these sites are accessed, it will play the following specially crafted .SWF files:

  • http://{BLOCKED}a.{BLOCKED}turiverzi.ro/excodec/ybeastl/c251eac.swf - detected as SWF_EXPLOYT.LDBQ
  • http://{BLOCKED}a.{BLOCKED}turiverzi.ro/excodec/ybeastl/cf99b2.swf - detected as SWF_EXPLOYT.LDBQ

It passes the following parameters with malicious URLs when it plays the said .SWF files respectively:

  • urli=http://{BLOCKED}a.{BLOCKED}turiverzi.ro/excodec/ybeastl/nslowu.php?id=4
  • exec=http://{BLOCKED}a.{BLOCKED}turiverzi.ro/excodec/ybeastl/mpocketa.php

As a result, malicious routines of the specially crafted .SWF files are exhibited on the affected system.

SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.874.03

FIRST VSAPI PATTERN DATE:

20 Jun 2014

VSAPI OPR PATTERN File:

10.875.00

VSAPI OPR PATTERN Date:

21 Jun 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_OBFUS.VTGD. 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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