TROJ_UPATRE.YYSPY

December 01, 2015
 Analysis by: Mar Philip Elaurza
 ALIASES:

Trojan.Upatre.IS (BITDEFENDER), Trojan-Downloader.Win32.Upatre.fgab (KASPERSKY), TrojanDownloader:Win32/Upatre (MICROSOFT), Downloader.Upatre!gen9 (NORTON)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as attachment to mass-mailed email messages. It 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 itself after execution.

  TECHNICAL DETAILS

File Size:

48,640 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

30 Oct 2015

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

It 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 and executes the following files:

  • %User Temp%\uzorunex.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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.90.166:{random port}/28K21/{hostname}/0/{OS Version}-{Service Pack}/0/{value}
  • http://{BLOCKED}.{BLOCKED}.90.166:{random port}/28K21/{hostname}/{data}
  • http://icanhazip.com
  • https://{BLOCKED}.{BLOCKED}.11.51:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.203.43:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.247.74:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.31.6:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.175.151:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.71.20:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.224.64:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.93.231:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.99.80:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.138.66:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.109.24:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.199.21:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.56.126:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.207.173:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.89.57:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.57.155:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.197.50:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.68.78:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.207.78:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.217.188:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.131.116:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.20.53:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.104.149:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.85.9:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.24.50:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.13.21:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.201.105:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.171.44:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.204.114:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.82.80:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.103.138:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.103.167:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.76.211:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.64.45:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.227.249:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.25.233:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.251.174:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.108.254:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.248.135:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.249.139:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.236.122:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.244.122:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.172.232:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.88.180:443/mouse4.jpg
  • https://{BLOCKED}.{BLOCKED}.155.22:443/mouse4.jpg

It deletes itself after execution.