TROJ_PIDIEF.YYJU

October 16, 2014
 Analysis by: Rika Joi Gregorio
 ALIASES:

PDF/Exploit.CVE-2013-2729.G (ESET)

 PLATFORM:

Windows

 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:

Downloaded from the Internet, Dropped by other malware, Spammed via email

This malware exploits the CVE-2013-2729 vulnerability, which leads to the download of a DYREZA malware. The said downloaded DYREZA variant has the capability to steal banking and bitcoin information.

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

This Trojan arrives as an attachment to email messages mass-mailed 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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

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

  TECHNICAL DETAILS

File Size:

476,741 bytes

File Type:

PDF

Initial Samples Received Date:

15 Oct 2014

Payload:

Downloads files

Arrival Details

This Trojan arrives as an attachment to email messages mass-mailed 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.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}ahore.com/Resources/Search/1510out.exe - detected as TSPY_DYRE.EKW

It takes advantage of the following software vulnerabilities to download possibly malicious files:

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

Other Details

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

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.216.05

FIRST VSAPI PATTERN DATE:

16 Oct 2014

VSAPI OPR PATTERN File:

11.217.00

VSAPI OPR PATTERN Date:

16 Oct 2014

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove malware/grayware files dropped/downloaded by TROJ_PIDIEF.YYJU. (Note: Please skip this step if the threats listed below have already been removed.)

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDIEF.YYJU. 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 the following Trend Micro Support pages for more information:


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