Agent Tesla Delivered via Fake Canon EOS Notification on Free OwnCloud Account

Published: 2020-03-11
Last Updated: 2020-03-11 09:06:48 UTC
by Xavier Mertens (Version: 1)
0 comment(s)

For a few days, there are new waves of Agent Tesla[1] landing in our mailboxes. I found one that uses two new "channels" to deliver the trojan. Today, we can potentially receive notifications and files from many types of systems or devices. I found a phishing sample that tries to hide behind a Canon EOS camera notification. Not very well designed but it’s uncommon to see this. It started with a simple email:

Note the beautiful typo in the mail subject! ("Qoute")

The malicious payload is delivered via the following path:

A ZIP archive is attached to the mail:

Photos and specification.zip (SHA256:0875804511b077f7e8b4d5f4dd11b61f2334b9b61da1018f6246739a348a6d19)

The archive contains an HTML file (Unicode): 

photos and specification.html (SHA256:ab6b5faa826f5f503d9b9c8c5de0e3b0d65bf88812a9f7b83bf97901c39d6ebe)

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML><HEAD>
<META name=GENERATOR content="MSHTML 11.00.9600.19626"></HEAD>
<BODY style="MARGIN: 0.5em">
<P><A href="hxxps://nuesterish742[.]owncloud[.]online/index.php/s/rEbK2f0fHiMTy2k"><IMG style="HEIGHT: 368px; WIDTH: 661px" border=0 hspace=0 alt="" src="hxxps://www[.]mirrorlessrumors[.]com/wp-content/uploads/2018/09/Bildschirmfoto-2018-09-02-um-07.29.06-700x368.png" width=699 align=baseline height=368></A><BR><BR><BR><FONT size=7><A href="hxxps://nuesterish742[.]owncloud[.]online/index.php/s/rEbK2f0fHiMTy2k"><STRONG>DOWNLOAD</STRONG></A><STRONG>&nbsp;&nbsp;&nbsp;&nbsp;</STRONG>
<A href="hxxps://nuesterish742[.]owncloud[.]online/index.php/s/rEbK2f0fHiMTy2k"><STRONG>VIEW</STRONG></A><BR><A href="hxxps://nuesterish742[.]owncloud[.]online/index.php/s/rEbK2f0fHiMTy2k"><FONT size=3>hxxps://nuesterish742[.]owncloud[.]online/index.php/s/rEbK2f0fHiMTy2k</FONT></A><BR><BR></FONT></P></BODY></HTML>

Here is the page rendered in a browser:

The next stage payload is hosted on a public OwnCloud account. OwnCloud is a very popular cloud storage solution. You can run your private cloud on-premises but they also offer a “cloud” solution and a free trial:

A file is shared via this trial account: “Photos and specification.cab” (SHA256:d6404503a8257ebf3d153e91d0b92c9ae8da7c710124781ae27e6a55c40b887f). It contains the final payload:

Photos and specification.exe (SHA256:5254a36f51199786127851940e49c50ffe04aafa091ba6518118125bd68a4c31) with a current VT score of 24/72[2]. This is the Agent Tesla itself.

It copies itself into C:\Users\admin\AppData\Roaming\ and implements persistence via a scheduled task:

C:\Windows\System32\schtasks.exe" /Create /TN "Updates\PHIvtqf" /XML "C:\Users\user\AppData\Local\Temp\tmp6CEB.tmp

The scheduled task configuration is also dumped on disk:

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.2" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
  <RegistrationInfo>
    <Date>2014-10-25T14:27:44.8929027</Date>
    <Author>SANDBOX\user</Author>
  </RegistrationInfo>
  <Triggers>
    <LogonTrigger>
      <Enabled>true</Enabled>
      <UserId>SANDBOX\user</UserId>
    </LogonTrigger>
    <RegistrationTrigger>
      <Enabled>false</Enabled>
    </RegistrationTrigger>
  </Triggers>
  <Principals>
    <Principal id="Author">
      <UserId>SANDBOX\user</UserId>
      <LogonType>InteractiveToken</LogonType>
      <RunLevel>LeastPrivilege</RunLevel>
    </Principal>
  </Principals>
  <Settings>
    <MultipleInstancesPolicy>StopExisting</MultipleInstancesPolicy>
    <DisallowStartIfOnBatteries>false</DisallowStartIfOnBatteries>
    <StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>
    <AllowHardTerminate>false</AllowHardTerminate>
    <StartWhenAvailable>true</StartWhenAvailable>
    <RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
    <IdleSettings>
      <StopOnIdleEnd>true</StopOnIdleEnd>
      <RestartOnIdle>false</RestartOnIdle>
    </IdleSettings>
    <AllowStartOnDemand>true</AllowStartOnDemand>
    <Enabled>true</Enabled>
    <Hidden>false</Hidden>
    <RunOnlyIfIdle>false</RunOnlyIfIdle>
    <WakeToRun>false</WakeToRun>
    <ExecutionTimeLimit>PT0S</ExecutionTimeLimit>
    <Priority>7</Priority>
  </Settings>
  <Actions Context="Author">
    <Exec>
      <Command>C:\Users\user\AppData\Roaming\PHIvtqf.exe</Command>
    </Exec>
  </Actions>
</Task>

You can detect hosts infected by Agent Tesla by checking connections over TCP/587 (SMTP submissions) which is usually permitted compared to TCP/25. In this case, it used the IP address %%ip:78.142.19.101% to exfiltrate data.

I also found other suspicious OwnCloud accounts:

nuesterish742.owncloud.online   
wighteredd264.owncloud.online
ntyclighta026.owncloud.online
idompoomel467.owncloud.online
titiollaug517.owncloud.online

Probably there are many more...

[1] https://any.run/malware-trends/agenttesla
[2] https://www.virustotal.com/gui/file/5254a36f51199786127851940e49c50ffe04aafa091ba6518118125bd68a4c31/detection

Xavier Mertens (@xme)
Senior ISC Handler - Freelance Cyber Security Consultant
PGP Key

Keywords: Agent Tesla Canon Malware OwnCloud Trojan
0 comment(s)
ISC Stormcast For Wednesday, March 11th 2020 https://isc.sans.edu/podcastdetail.html?id=6904

Comments

cwqwqwq

www

Nov 17th 2022
6 months ago

eweew<a href="https://www.seocheckin.com/edu-sites-list/">mashood</a>

EEW

Nov 17th 2022
6 months ago

WQwqwqwq[url=https://www.seocheckin.com/edu-sites-list/]mashood[/url]

qwq

Nov 17th 2022
6 months ago

dwqqqwqwq mashood

mashood

Nov 17th 2022
6 months ago

[https://isc.sans.edu/diary.html](https://isc.sans.edu/diary.html)

isc.sans.edu

Nov 23rd 2022
6 months ago

[https://isc.sans.edu/diary.html | https://isc.sans.edu/diary.html]

isc.sans.edu

Nov 23rd 2022
6 months ago

What's this all about ..?

isc.sans.edu

Dec 3rd 2022
6 months ago

password reveal .

isc.sans.edu

Dec 3rd 2022
6 months ago

<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure:

<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure. The social networks are not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go.

<a hreaf="https://technolytical.com/">the social network</a> is not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go. The social networks only collect the minimum amount of information required for the service that they provide. Your personal information is kept private, and is never shared with other companies without your permission

isc.sans.edu

Dec 26th 2022
5 months ago

https://thehomestore.com.pk/

isc.sans.edu

Dec 26th 2022
5 months ago

Login here to join the discussion.


Diary Archives