Analysis by: Sammy Chua
ALIASES:

Troj/Upatre-UC (Sophos); Downloader.Upatre (Symantec); TrojanDownloader:Win32/Upatre!rfn (Microsoft); Trojan-Downloader.Win32.Upatre.exeb (Kapersky);

 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 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: 35,840 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 25 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.

Other Details

This Trojan connects to the following possibly malicious URL:

  • https://{BLOCKED}09.{BLOCKED}9.11.51/plar22.png
  • https://{BLOCKED}12.{BLOCKED}3.203.43/plar22.png
  • https://{BLOCKED}50.{BLOCKED}9.49.11/plar22.png
  • https://{BLOCKED}73.{BLOCKED}6.247.74/plar22.png
  • https://{BLOCKED}73.{BLOCKED}8.31.6/plar22.png
  • https://{BLOCKED}76.{BLOCKED}01.135.103/plar22.png
  • https://{BLOCKED}86.{BLOCKED}8.94.38/plar22.png
  • https://{BLOCKED}94.{BLOCKED}8.191.245/plar22.png
  • http://1{BLOCKED}7.1{BLOCKED}9.90.166:{random port}/24GB22/{host name}/0/{os version}/0/{encrypted IP}
  • http://1{BLOCKED}7.1{BLOCKED}9.90.166:{random port}/24GB22/{host name}/{data}
  • https://{BLOCKED}97.{BLOCKED}10.199.21/plar22.png
  • https://{BLOCKED}03.{BLOCKED}15.103.27/plar22.png
  • https://{BLOCKED}03.{BLOCKED}29.197.50/plar22.png
  • https://{BLOCKED}08.{BLOCKED}17.68.78/plar22.png
  • https://{BLOCKED}09.{BLOCKED}7.49.117/plar22.png
  • https://{BLOCKED}13.{BLOCKED}2.138.154/plar22.png
  • https://{BLOCKED}4.1{BLOCKED}8.217.188/plar22.png
  • https://{BLOCKED}4.3{BLOCKED}.131.116/plar22.png
  • https://{BLOCKED}7.1{BLOCKED}9.20.53/plar22.png
  • https://{BLOCKED}7.5{BLOCKED}.144.177/plar22.png
  • https://{BLOCKED}5.6{BLOCKED}.159.18/plar22.png
  • https://{BLOCKED}3.2{BLOCKED}8.156.246/plar22.png
  • https://{BLOCKED}5.3{BLOCKED}.236.173/plar22.png
  • https://{BLOCKED}7.2{BLOCKED}7.229.215/plar22.png
  • https://{BLOCKED}7.2{BLOCKED}1.147.66/plar22.png
  • https://{BLOCKED}7.2{BLOCKED}1.195.6/plar22.png
  • https://{BLOCKED}7.2{BLOCKED}2.201.222/plar22.png
  • https://{BLOCKED}7.2{BLOCKED}2.201.61/plar22.png
  • https://{BLOCKED}8.7{BLOCKED}.242.203/plar22.png
  • https://{BLOCKED}9.1{BLOCKED}4.171.44/plar22.png
  • https://{BLOCKED}9.9{BLOCKED}204.114/plar22.png
  • https://{BLOCKED}2.2{BLOCKED}0.82.80/plar22.png
  • https://{BLOCKED}7.4{BLOCKED}.30.156/plar22.png
  • https://{BLOCKED}8.1{BLOCKED}8.101.67/plar22.png
  • https://{BLOCKED}8.7{BLOCKED}.233.105/plar22.png
  • https://{BLOCKED}2.1{BLOCKED}5.76.211/plar22.png
  • https://{BLOCKED}2.1{BLOCKED}0.64.45/plar22.png
  • https://{BLOCKED}5.1{BLOCKED}5.104.170/plar22.png
  • https://{BLOCKED}7.2{BLOCKED}9.142.189/plar22.png
  • https://{BLOCKED}9.2{BLOCKED}9.120.43/plar22.png
  • https://{BLOCKED}4.1{BLOCKED}1.130.9/plar22.png
  • https://{BLOCKED}4.4{BLOCKED}.82.66/plar22.png
  • http://m{BLOCKED}ip.{BLOCKED}nsomatic.com/

It deletes the initially executed copy of itself

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.938.04
FIRST VSAPI PATTERN DATE: 24 Sep 2015
VSAPI OPR PATTERN File: 11.939.00
VSAPI OPR PATTERN Date: 25 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

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