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TROJ_UPATRE.WYSL

May 26, 2014
 Analysis by: Jimelle Monteser
 ALIASES:

TrojanDownloader:Win32/Upatre.AA (Microsoft ),Downloader.Upatre (Symantec),Downloader/Win32.Upatre (AhnLab-V3), Win32/TrojanDownloader.Waski.C (ESET-NOD32), Trojan-Downloader.Win32.Small.cytd (Kaspersky)

 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 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 deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

17,408 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 May 2014

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

  • %User Temp%\budha.exe

(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.)

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan saves the files it downloads using the following names:

  • %User Temp%\kilf.exe - detected as TSPY_ZBOT.WYSL

(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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}thosting.com/css/Targ-1205USmp.enc
  • http://www.{BLOCKED}thosting.com/css/Targ-1205USmp.enc
  • http://{BLOCKED}oficinas.com/fonts/Targ-1205USmp.enc
  • http://www.{BLOCKED}oficinas.com/fonts/Targ-1205USmp.enc

It deletes the initially executed copy of itself

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.800.06

FIRST VSAPI PATTERN DATE:

18 May 2014

VSAPI OPR PATTERN File:

10.801.00

VSAPI OPR PATTERN Date:

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

  • TSPY_ZBOT.WYSL

Step 3

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