Another new malware delivery method today for Gootkit banking trojan. This is the first time I have seen Microsoft Sway involved in a malware delivery chain. This is another set of malspam that is coming via the mailgun system.
This was sent to me via our submissions system, so I have edited the email headers to replace the real recipient with victimsdomain.com
An email with the subject of Invoice from EMERGE FINANCE coming from email@example.com via the Mailgun SMTP mail relay service with a link in email body that downloads a zip containing a lnk file that contacts another site eventually downloads the Gootkit banking trojan
They use email addresses and subjects that will entice a user to read the email and open the attachment. A very high proportion are being targeted at small and medium size businesses, with the hope of getting a better response than they do from consumers.
Emerge Finance 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
This starts with a link to https://sway.com/NKvbD9ArVVij1EdF?ref=Link
that has the link to https://9ofs9a.bn.files.1drv.com/y4m-JQF3JCFDuIANTImGyvcZkiF-BzoZbIYOEWYNZkHkC8b1LRpbNQOG6yQekiz_IVm_pmPclkrJxLwSqQQ6VHYYsajzGzRBKrIvmMbIQWsDU7zR_l36SaJMoWmM9ZccL2_mYfN_e0AkIjTZMzlUHh_VvFG_HVn5_me5KWBdhJFYRXnwM2G_ib_3IwpDZou6aTq/Powered%20by%20Adobe%20Acrobat.zip?download&psid=1
This malware lnk file downloads from https://studentbackr.com/blog/VtrBcgsll.exe VirusTotal | AnyrunApp| Hybrid Analysis | Note: I got a 404 trying to get this file but the person who submitted to me managed to get it from his location.
One of the emails looks like:
Date: Tue 10/04/2018 17:54
Subject: Invoice from EMERGE FINANCE
Your invoice is now ready to view.
- To view your invoice click here <https://sway.com/NKvbD9ArVVij1EdF?ref=Link>
Got a question about your invoice?
Call us on +44 1800 660 633
If you’re a Business Partner, please call +44 1800 660 666
The EMERGE FINANCE
Please note: Confidentiality Notice: The information contained in this message may be confidential and legally privileged. It is intended only for use of the individual named. If you are not the intended recipient, you are hereby notified that the disclosure, copying, distribution, or taking of any action regards to the contents of this fax – except its direct delivery to the intended recipient – is strictly prohibited. If you have received this fax in error, please notify the sender immediately and destroy this cover sheet along with its contents, and delete from your system, if applicable.
Our Mailing Address:
68 St. John’s Road Reading RG4 5AL
Call us on +44 1800 660 633
If you don’t want receive emails from us please click and,
Received: from victimsdomain.com (172.16.10.23) by victimsdomain.com
(172.16.10.23) with Microsoft SMTP Server (TLS) id 15.0.1263.5 via Mailbox
Transport; Tue, 10 Apr 2018 11:06:26 +0100
Received: from victimsdomain.com (172.16.10.212) by victimsdomain.com
(172.16.10.212) with Microsoft SMTP Server (TLS) id 15.0.1263.5; Tue, 10 Apr
2018 11:06:26 +0100
Received: from mddcsec6.victimsdomain.com (172.16.10.12) by victimsdomain.com
(172.16.10.212) with Microsoft SMTP Server (TLS) id 15.0.1263.5 via Frontend
Transport; Tue, 10 Apr 2018 11:06:26 +0100
Received: from so254-48.mailgun.net ([126.96.36.199]:37634)
by mddcsec6.victimsdomain.com with esmtps (TLSv1.2:AES128-GCM-SHA256:128)
for firstname.lastname@example.org; Tue, 10 Apr 2018 11:06:24 +0100
DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.demolaysp.com.br;
q=dns/txt; s=mailo; t=1523354760; h=Content-Type: Mime-Version:
Subject: Reply-To: From: Date: List-Unsubscribe: Message-Id: Sender;
Received: from 188.8.131.52 (Unknown [184.108.40.206]) by mxa.mailgun.org
with ESMTP id 5acc8a18.7f74af5ce6f8-smtp-out-n03; Tue, 10 Apr 2018 09:55:36
Date: Tue, 10 Apr 2018 09:53:39 -0700
From: “Marija – E-merge” <email@example.com>
Reply-To: “Marija – E-merge” <firstname.lastname@example.org>
X-Mailer: PHPMailer 5.0.0 (phpmailer.codeworxtech.com)
Subject: *SPAM* Invoice from EMERGE FINANCE
Content-Type: multipart/alternative; boundary=”————–199299566839222916348943″
Dkim-Signature: v=1; a=rsa-sha256; d=mg.demolaysp.com.br;
t=1523379219; h=list-unsubscribe:date:from:subject:mime-version; bh=K6UIie7lXkTcaMQHO857fzNZRhkB49fi+9vEIo5ApgU=; b=yCuhDc/VmHtLMWu4s5X2EN9JuQqBUYJo369eBTnUEbPNnNcXkNppNj4BnZm/FT rf0m+YKnG2TqmiV0HixX30ieUUKiyX2iPVBMfqOg0mLj7Kjje3ozz7CWlLfLcz3B UHHa6IF4MyCG5kD09K2X1rYUrf+IAJLXLTBB8ne7RBbVA=
To: Undisclosed recipients:;
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.
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.