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TROJ_UPATRE.CPV

September 22, 2015
 Analysis by: Mar Philip Elaurza
 ALIASES:

Downloader.Upatre (Symantec), Trojan:Win32/Dynamer!ac (Microsoft), a variant of Win32/Kryptik.DXKX (ESET-NOD32), Trojan.Win32.Upatre.dxedsm (NANO-Antivirus)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • 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 deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

29,696 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

21 Sep 2015

Payload:

Connects to URLs/IPs, Downloads files

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.)

Download Routine

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

  • http://{BLOCKED}.{BLOCKED}.11.51/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.203.43/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.213.123/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.49.11/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.247.74/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.31.6/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.135.103/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.123.210/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.94.38/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.191.245/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.199.21/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.214.102/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.103.27/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.197.50/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.68.78/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.49.117/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.138.154/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.231.11/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.217.188/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.131.116/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.20.53/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.144.177/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.159.18/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.248.235/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.156.246/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.236.173/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.229.215/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.147.66/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.195.6/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.201.222/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.201.61/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.242.203/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.171.44/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.204.114/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.10.116/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.82.80/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.30.156/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.101.67/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.233.105/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.76.211/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.64.45/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.104.170/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.142.189/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.120.43/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.140.7/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.193.210/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.105.164/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.130.9/cutet13.zip
  • http://{BLOCKED}.{BLOCKED}.82.66/cutet13.zip

It saves the files it downloads using the following names:

  • %User Temp%\silebekot.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.)

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://myip.dnsomatic.com/

It deletes the initially executed copy of itself

NOTES:

This Trojan connects to the following URLs to report infection of the affected system:

  • http://{BLOCKED}.{BLOCKED}.90.166:{port} /A17U11/{Host Name}/0/{OS Version}-{Service Pack}/0/{value}
  • http://{BLOCKED}.{BLOCKED}.90.166:{port} /A17U11/{Host Name}/{data}

It installs authentication certificates to enable access of download sites.

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.926.03

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

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