ISRStealer via fake Prudential Assurance Company Purchase Order

Every now & again we see a resurgence of ISRStealer  info-stealer / Keylogger Trojan Malware. This malware has been around since 2011 and gets intermittent distribution campaigns.

You can now submit suspicious sites, emails and files via our Submissions system

Prudential Assurance Company Singapore has not been hacked or had their email or other servers compromised. They are not sending the emails to you. They are just innocent victims in exactly the same way as every recipient of these emails

Purchase order #693641_3451483.zip : Extracts to:   Purchase order #693641_3451483.exe      Current Virus total detections: Anyrun |

The C2 & info drop site on this one is a Turkish site http://shahkara.com.tr/wp-content/reh/PHP/PHP/index.php This domain has been registered since 2016 but there is an under construction message on home page. I have no way of knowing if it is a malware site or whether it has been abandoned by its owner  and compromised to be used in this malware infostealer campaign.

One of the  emails looks like:

From:  Distribution Division <This email address is being protected from spambots. You need JavaScript enabled to view it.>

Date: Wed 15/05/2019 09:50

Subject:  Purchase order #693641_3451483

Attachment: Purchase order #693641_3451483.zip

Body content:

Dear Sir,

Please find attached herewith our Purchase Order

Kindly acknowledge the receipt of the same and arrange to dispatch the material ASAP.

Thanks & Warm Regards.

Warm Regards,

Joanne Pun

Distribution Division

Prudential Assurance Company Singapore

51 Scotts Road #01-01 Prudential@Scotts Singapore 228241

Mobile +65 8821 6814

This email address is being protected from spambots. You need JavaScript enabled to view it.

www.prudential.com.sg

 

Screenshot:

Fake Prudential email

Fake Prudential email

Email Headers:

IP Hostname City Region Country Organisation
206.189.205.82  North Bergen New Jersey US AS14061 DigitalOcean, LLC
102.165.49.42  Pennsylvania US AS46664 VolumeDrive

Note: Only the final IP address outside of your network in the Received: fields can be trusted as others can be spoofed

Received: from [206.189.205.82] (port=53992 helo=centos-s-2vcpu-4gb-nyc1-01)
	by my email server with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256)
	(Exim 4.91)
	(envelope-from <This email address is being protected from spambots. You need JavaScript enabled to view it.>)
	id 1hQpcg-0004ln-E1
	for This email address is being protected from spambots. You need JavaScript enabled to view it.; Wed, 15 May 2019 09:50:51 +0100
Received: from [102.165.49.42]
	by centos-s-2vcpu-4gb-nyc1-01 with esmtpa (Exim 4.91)
	(envelope-from <This email address is being protected from spambots. You need JavaScript enabled to view it.>)
	id 1hQpcU-0006wp-Dd; Wed, 15 May 2019 08:50:38 +0000
Content-Type: multipart/mixed; boundary="===============1674402868=="
MIME-Version: 1.0
Subject: Purchase order #693641_3451483
To: Recipients <This email address is being protected from spambots. You need JavaScript enabled to view it.>
From: "Distribution Division" <This email address is being protected from spambots. You need JavaScript enabled to view it.>
Date: Wed, 15 May 2019 01:50:22 -0700
Reply-To: This email address is being protected from spambots. You need JavaScript enabled to view it.
Message-Id: <E1hQpcU-0006wp-Dd@centos-s-2vcpu-4gb-nyc1-01>
screenshot of email headers & server trackbacks

screenshot of email headers & server trackbacks

These malicious attachments normally have a password stealing component, with the aim of stealing your bank, PayPal or other financial details along with your email or FTP ( web space) log in credentials. Many of them are also designed to specifically steal your Facebook and other social network log in details. A very high proportion are Ransomware versions that encrypt your files and demand money ( about £350/$400) to recover the files.

  All the alleged senders, amounts, reference numbers, Bank codes, companies, names of employees, employee positions, email addresses and phone numbers mentioned in the emails are all random. Some of these companies will exist and some won’t.  Don’t try to respond by phone or email, all you will do is end up with an innocent person or company who have had their details spoofed and picked at random from a long list that the bad guys have previously found. The bad guys choose companies, Government departments and organisations  with subjects that are designed to entice you or alarm you into blindly opening the attachment or clicking the link in the email to see what is happening.  

Please read our How to protect yourselves page for simple, sensible advice on how to avoid being infected by this sort of socially engineered malware.

 

This is another one of the  files that unless you have “show known file extensions enabled“, can easily be mistaken for  a genuine  DOC / PDF / JPG or other common file instead of the .EXE / .JS file it really is, so making it much more likely for you to accidentally open it and be infected.

 Be very careful with email attachments. All of these emails use Social engineering tricks to persuade you to open the attachments that come with the email. Whether it is a message saying “look at this picture of me I took last night” and it appears to come from a friend or is more targeted at somebody who regularly is likely to receive PDF attachments or Word .doc attachments or any other common file that you use every day.

The basic rule is NEVER open any attachment to an email, unless you are expecting it. Now that is very easy to say but quite hard to put into practice, because we all get emails with files attached to them. Our friends and family  love to send us pictures of them doing silly things, or even cute pictures of the children or pets.

Never just blindly click on the file in your email program. Always save the file to your downloads folder, so you can check it first. Many malicious files that are attached to emails will have a faked extension. That is the 3 letters at the end of the file name. Unfortunately windows by default hides the file extensions so you need to Set your folder options to “show known file types. Then when you unzip the zip file that is supposed to contain the pictures of “Sally’s dog catching a ball” or a report in word document format that work has supposedly sent you to finish working on at the weekend, or an invoice or order confirmation from some company,  you can easily see if it is a picture or document & not a malicious program.

If you see JS or .EXE or .COM or .PIF or .SCR or .HTA .vbs, .wsf , .jse  .jar at the end of the file name DO NOT click on it or try to open it, it will infect you.

While the malicious program is inside the zip file, it cannot harm you or automatically run. When it is just sitting unzipped in your downloads folder it won’t infect you, provided you don’t click it to run it. Just delete the zip and any extracted file and everything will be OK. You can always run a scan with your antivirus to be sure. There are some zip files that can be configured by the bad guys to automatically run the malware file when you double click the zip to extract the file. If you right click any suspicious zip file received, and select extract here or extract to folder ( after saving the zip to a folder on the computer) that risk is virtually eliminated. Never attempt to open a zip directly from your email, that is a guaranteed way to get infected. The best way is to just delete the unexpected zip and not risk any infection.

:

IOC:

Main object- “Purchase order #693641_3451483.exe”sha256 c589b1c910a2c186fd86e47b144481e20b8ce2222697215a0609bcd9994d034esha1 b5eece424f6e5638e437d3f9189501c64d038f5fmd5 86e6762b3657a4e103b1c1a3140368e0DNS requestsdomain shahkara.com.trConnectionsip 185.111.232.54HTTP/HTTPS requestsurl http://shahkara.com.tr/wp-content/reh/PHP/PHP/index.php?action=add&username=This email address is being protected from spambots. You need JavaScript enabled to view it.&password=honeypass356&app=Chrome&pcname=USER-PC&sitename=https://www.facebook.com/url http://shahkara.com.tr/wp-content/reh/PHP/PHP/index.php?action=add&username=This email address is being protected from spambots. You need JavaScript enabled to view it.&password=honeypass356&app=Opera&pcname=USER-PC&sitename=https://www.facebook.comurl http://shahkara.com.tr/wp-content/reh/PHP/PHP/index.php?action=add&username=This email address is being protected from spambots. You need JavaScript enabled to view it.&password=honeypass356&app=MS%20Outlook%202002/2003/2007&pcname=USER-PC&sitename=192.168.1.1

Read more https://myonlinesecurity.co.uk/isrstealer-via-fake-prudential-assurance-company-purchase-order/

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