Analysis by: Janus Agcaoili
ALIASES:

Downloader.Upatre!g14 (Symantec), TrojanDownloader:Win32/Upatre (Microsoft), Upatre-FADP!CE3C21494991 (McAfee)

 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 modifies the Internet Explorer Zone Settings.

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

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 73,728 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 18 Sep 2015

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 injects threads into the following normal process(es):

  • %System%\svchost.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Download Routine

This Trojan downloads the file from the following URL and renames the file when stored in the affected system:

  • http://{BLOCKED}7.{BLOCKED}07.229.215/cuteg12.zip
  • http://{BLOCKED}3.{BLOCKED}48.156.246/cuteg12.zip
  • http://{BLOCKED}2.{BLOCKED}75.10.116/cuteg12.zip
  • http://{BLOCKED}08{BLOCKED}117.68.78/cuteg12.zip
  • http://{BLOCKED}7.{BLOCKED}22.201.61/cuteg12.zip
  • http://{BLOCKED}09{BLOCKED}27.49.117/cuteg12.zip
  • http://{BLOCKED}03{BLOCKED}129.197.50/cuteg12.zip
  • http://{BLOCKED}7.{BLOCKED}22.201.222/cuteg12.zip
  • http://{BLOCKED}12{BLOCKED}133.203.43/cuteg12.zip
  • http://{BLOCKED}80{BLOCKED}233.123.210/cuteg12.zip
  • http://{BLOCKED}5.{BLOCKED}4.159.18/cuteg12.zip
  • http://{BLOCKED}86{BLOCKED}68.94.38/cuteg12.zip
  • http://{BLOCKED}50{BLOCKED}129.49.11/cuteg12.zip
  • http://{BLOCKED}03{BLOCKED}115.103.27/cuteg12.zip
  • http://{BLOCKED}7.{BLOCKED}09.20.53/cuteg12.zip
  • http://{BLOCKED}13{BLOCKED}92.138.154/cuteg12.zip
  • http://{BLOCKED}2.{BLOCKED}15.76.211/cuteg12.zip
  • http://{BLOCKED}8.{BLOCKED}2.233.105/cuteg12.zip
  • http://{BLOCKED}4.{BLOCKED}41.130.9/cuteg12.zip
  • http://{BLOCKED}2.{BLOCKED}60.64.45/cuteg12.zip
  • http://{BLOCKED}94{BLOCKED}28.191.245/cuteg12.zip
  • http://{BLOCKED}97{BLOCKED}210.199.21/cuteg12.zip
  • http://{BLOCKED}7.{BLOCKED}21.147.66/cuteg12.zip
  • http://{BLOCKED}8.{BLOCKED}08.101.67/cuteg12.zip
  • http://{BLOCKED}99{BLOCKED}192.214.102/cuteg12.zip
  • http://{BLOCKED}42{BLOCKED}47.213.123/cuteg12.zip
  • http://{BLOCKED}09{BLOCKED}199.11.51/cuteg12.zip
  • http://{BLOCKED}4.{BLOCKED}0.82.66/cuteg12.zip
  • http://{BLOCKED}1.{BLOCKED}89.140.7/cuteg12.zip
  • http://{BLOCKED}76{BLOCKED}101.135.103/cuteg12.zip
  • http://{BLOCKED}6.{BLOCKED}49.248.235/cuteg12.zip
  • http://{BLOCKED}1.{BLOCKED}02.193.210/cuteg12.zip
  • http://{BLOCKED}1.{BLOCKED}46.105.164/cuteg12.zip
  • http://{BLOCKED}9.{BLOCKED}39.120.43/cuteg12.zip
  • http://{BLOCKED}7.{BLOCKED}21.195.6/cuteg12.zip
  • http://{BLOCKED}16{BLOCKED}254.231.11/cuteg12.zip
  • http://{BLOCKED}4.{BLOCKED}3.131.116/cuteg12.zip
  • http://{BLOCKED}2.{BLOCKED}30.82.80/cuteg12.zip
  • http://{BLOCKED}73{BLOCKED}248.31.6/cuteg12.zip
  • http://{BLOCKED}9.{BLOCKED}.204.114/cuteg12.zip
  • http://{BLOCKED}9.{BLOCKED}44.171.44/cuteg12.zip
  • http://{BLOCKED}5.{BLOCKED}3.236.173/cuteg12.zip
  • http://{BLOCKED}4.{BLOCKED}48.217.188/cuteg12.zip
  • http://{BLOCKED}73{BLOCKED}216.247.74/cuteg12.zip
  • http://{BLOCKED}7.{BLOCKED}8.30.156/cuteg12.zip
  • http://{BLOCKED}7.{BLOCKED}7.144.177/cuteg12.zip
  • http://{BLOCKED}7.{BLOCKED}49.142.189/cuteg12.zip
  • http://{BLOCKED}5.{BLOCKED}35.104.170/cuteg12.zip
  • http://{BLOCKED}8.{BLOCKED}0.242.203/cuteg12.zip

It saves the files it downloads using the following names:

  • %User Temp%\zevahega.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.)

Trend Micro detects the dowloaded file as:

  • TSPY_DYRE.JAN

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

Information Theft

This Trojan gathers the following data:

  • Computer Name
  • OS Version
  • Service Pack

Other Details

This Trojan connects to the following URL(s) to get the affected system's IP address:

  • http://icanhazip.com/

It does the following:

  • This Trojan connects to the following URLs to report infection of the affected system:
    • http://{BLOCKED}7.{BLOCKED}9.90.166:{Port}/S1712/{Hostname}/0/{OS Version}-{Service Pack}/0/EDGBIBJBFHG
    • http://{BLOCKED}7.{BLOCKED}9.90.166:{Port}/S1712/{Hostname}/{Data}/{Data}/{Data}/EDGBIBJBFHG
  • It installs authentication certificates to enable access of download sites.

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.926.02
FIRST VSAPI PATTERN DATE: 18 Sep 2015
VSAPI OPR PATTERN File: 11.927.00
VSAPI OPR PATTERN Date: 19 Sep 2015

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

Reset Internet security settings

[ Learn More ]

Step 4

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

    • TSPY_DYRE.JAN

Step 5

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