arrow_back
search
close

TROJ_EXPLOYT.XLT

July 15, 2014
 Analysis by: Abraham Latimer Camba
 ALIASES:

Exp/20132729-A(Sophos), HEUR:Exploit.PDF.Generic(Kaspersky), PDF/Exploit.CVE-2013-2729.E trojan(NOD32),

 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: Yes

  • 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 does not have any propagation routine.

It does not have any backdoor routine.

It takes advantage of software vulnerabilities to allow a remote user or malware/grayware to download files. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

13,687 bytes

File Type:

PDF

Initial Samples Received Date:

02 Jul 2014

Payload:

Downloads files

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.

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}hemes.com/flash.exe

It takes advantage of the following software vulnerabilities to allow a remote user or malware/grayware to download files:

It saves the files it downloads using the following names:

  • %Temporary Internet Files%\Flash.exe

(Note: %Temporary Internet Files% is the Temporary Internet Files folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temporary Internet Files on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Microsoft\Windows\Temporary Internet Files on Windows Vista and 7.)

As of this writing, the said sites are inaccessible.

NOTES:

For OS versions in 6.0 and above (Windows Vista and above):

This malware will perform the malicious routines mentioned above if it is running under the following versions of Adobe Reader:

  • 9.303
  • 9.304
  • 9.4
  • 9.401
  • 9.402
  • 9.403
  • 9.404
  • 9.405
  • 9.406
  • 9.407
  • 9.5
  • 9.501
  • 9.502
  • 9.503
  • 9.504
  • 10.101
  • 10.102
  • 10.103
  • 10.104
  • 10.105
  • 10.106
  • 11
  • 11.001

For OS versions below 6.0 (Windows Server 2003 R2 and below):

This malware will perform an infinite loop causing the affected Adobe Reader to hang/freeze.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.898.04

FIRST VSAPI PATTERN DATE:

02 Jul 2014

VSAPI OPR PATTERN File:

10.899.00

VSAPI OPR PATTERN Date:

02 Jul 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

Search and delete this file

[ Learn More ]
There may be some 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.
  • %Temporary Internet Files%\flash.exe

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_EXPLOYT.XLT. 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.

Step 4

Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.  


Did this description help? Tell us how we did.