TROJ_DLOADER.YNLA

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

Win32/TrojanDownloader.Small.PSD 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:

Downloaded from the Internet

This Trojan may be downloaded by other malware/grayware from remote sites.

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

  TECHNICAL DETAILS

File Size:

90,112 bytes

File Type:

, EXE

Memory Resident:

No

Initial Samples Received Date:

06 May 2014

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • TROJ_PIDIEF.YNLA

Download Routine

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

  • http://{BLOCKED}iaingenieria.es/111
  • http://{BLOCKED}nces-immobilier.com/111
  • http://{BLOCKED}rprincesse.web.{BLOCKED}2.com/111
  • http://{BLOCKED}ild.com/111
  • http://{BLOCKED}afari.com/111
  • http://{BLOCKED}s.{BLOCKED}i.ro/111
  • http://{BLOCKED}o.web.{BLOCKED}2.com/111
  • http://{BLOCKED}a.com/111
  • http://{BLOCKED}cgeneration.com/111
  • http://{BLOCKED}i.{BLOCKED}5.eu/111
  • http://{BLOCKED}a.es/111
  • http://{BLOCKED}eria.com/111
  • http://{BLOCKED}orgeous.com/111
  • http://{BLOCKED}b.com/111
  • http://{BLOCKED}dubai.com/111
  • http://{BLOCKED}liariarobinson.com/111
  • http://{BLOCKED}nin.cba.pl/111
  • http://{BLOCKED}s.net/111
  • http://{BLOCKED}s.net.pl/111
  • http://{BLOCKED}k.{BLOCKED}r.ru/111
  • http://{BLOCKED}oteles.pt/111
  • http://{BLOCKED}331.{BLOCKED}ver.de/111
  • http://{BLOCKED}air.com/111
  • http://{BLOCKED}r.com/111
  • http://{BLOCKED}iaz.net/111
  • http://{BLOCKED}v.com/111
  • http://{BLOCKED}k.{BLOCKED}o.ro/111
  • http://www.{BLOCKED}eboer.com/111
  • http://www.{BLOCKED}r.it/111

It saves the files it downloads using the following names:

  • %User Temp%\mss{random}.exe - TSPY_ZBOT.YNLA

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp 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:

10.778.08

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 that dropped/downloaded TROJ_DLOADER.YNLA

    • TROJ_PIDIEF.YNLA

Step 3

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

    • TSPY_ZBOT.YNLA

Step 4

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


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