TROJ_PIDIEF.YNLA

May 08, 2014
 Analysis by: Mark Joseph Manahan
 ALIASES:

Troj/20132729-E (Sophos) ,Trojan horse Exploit_c.AANQ (AVG) ,PDF/CVE20132729.A!exploit (Fortinet) ,JS/Pdfka.NA (exact, not disinfectable) (Fprot) ,Trojan.JS.Pdfka (Ikarus) ,Exploit.JS.CVE-2010-0188.f (Kaspersky) ,Exploit:JS/Pdfjsc.AU (Microsoft) ,PDF/Exploit.CVE-2013-2729.A trojan (Eset)

 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

Infection Channel:

Spammed via email

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It takes advantage of unknown vulnerabilities in certain software to download malicious files. It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

11,028 bytes

File Type:

PDF

Memory Resident:

No

Initial Samples Received Date:

06 May 2014

Payload:

Downloads files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

  • AcroRd32.exe

Download Routine

This Trojan takes advantage of unknown vulnerabilities in the following software to download malicious files:

After successfully exploiting the said vulnerability, this malware connects to the following URLs to possibly download other malicious files:

  • http://{BLOCKED}tlob.{BLOCKED}ut.de/11.exe

It saves the files it downloads using the following names:

  • %Temporary Internet Files%\11.exe - detected as TROJ_DLOADER.YNLA

(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.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.778.04

FIRST VSAPI PATTERN DATE:

06 May 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

Remove the malware/grayware file dropped/downloaded by TROJ_PIDIEF.YNLA

    • TROJ_DLOADER.YNLA

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDIEF.YNLA. 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.  https://www.adobe.com/support/security/bulletins/apsb13-15.html


Did this description help? Tell us how we did.