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TROJ_UPATRE.FDT

January 10, 2015
 Analysis by: Adrian Cofreros
 ALIASES:

TrojanDownloader:Win32/Upatre.AF(Microsoft),Win32/TrojanDownloader.Waski.A(NOD32),Trojan.Win32.Staser.aryz(Kaspersky)

 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

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 itself after execution.

  TECHNICAL DETAILS

File Size:

24,064 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

09 Dec 2014

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%\satos.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following files:

  • %User Temp%\utt28A6.tmp- contains the executed malware path(will be overwrited once it downloads in which it will save a file)

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}-DRIVE-TRANSYND-TES295-ATF.COM/images/inf21.jpa
  • http://{BLOCKED}tsyntheticmotoroil.com/images/inf21.jpa
  • http://www.{BLOCKED}-drive-transynd-tes295-atf.com/images/inf21.jpa
  • http://www.{BLOCKED}tsyntheticmotoroil.com/images/inf21.jpa

It saves the files it downloads using the following names:

  • %User Temp%\EXE{value}.exe -it will be executed, detected as TSPY_DYRE.CBA
  • %User Temp%\utt28A6.tmp -encrypted form of the downloaded file

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Trojan deletes itself after execution.

NOTES:

It connects to the following URL to report infection of the affected system:

  • http://{BLOCKED}.{BLOCKED}.228.4:{random port}/0512uk21/{computer name of affected system}/0/{OS version}-{service pack}/0/
  • http://{BLOCKED}.{BLOCKED}.228.4:{random port}/0512uk21/{computer name of affected system}/{value}/{value}/{value}

It reports the following information of the affected system:

  • Computer Name
  • OS version
  • Service Pack

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.336.07

FIRST VSAPI PATTERN DATE:

10 Dec 2014

VSAPI OPR PATTERN File:

11.337.00

VSAPI OPR PATTERN Date:

11 Dec 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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

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

    • TSPY_DYRE.CBA

Step 4

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.
  • %User Temp%\utt28A6.tmp

Step 5

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