The gang who were spreading Gootkit banking trojan via Mailchimp have changed after all the adverse publicity and are now using Mailgun another similar distribution service to get their malware laden emails delivered to unsuspecting victims. Lets see how long it takes Mailgun to catch on & stop the abuse of their service.
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.
There are 2 versions currently spreading. In the first version There are no attachments in the email, instead there is a link in the email body.
In this example the link is to https://afirmfwc.org/Payment Info.docx Which contains an embedded image which they ask you to click on which downloads the malware via Bitsadmin ( see the anyrun video analysis report for the infection chain & path )
One of the emails looks like:
Date: Mon 26/03/2018 21:59 ( arrived 1501 UK time)
Subject: New Direct Debit 6964284 payment to Social Media Drive
Social Media Drive is charging you £ 542.00 for Invoice 6964284 issued 26/03/2018 with balance £ 540.00.
View your Payment Invoice.
We will debit your bank account ******37 (BARCLAYS BANK PLC) by Direct Debit on or shortly after 2018-03-23.
This payment will appear on your bank statement as GoCardless, ref: SMDRIVE-KXYR7BBZD7.
We will notify you via email at least 3 working days in advance of any changes to your payment date or amount.
If there is an issue with this payment please contact Social Media Drive at firstname.lastname@example.org or on +44 7702 194107.
+44 20 7183 8674
The second version has a doc x attachment with same result as first version. These are coming from numerous different senders with pending payment to random names and random amounts but all coming via the mailgun mail sending system
I nеed you to mаkе а GBP 3,647.45 fastеr paymеnt in favour of thе nеw сontractor.
Sort code: 30-89-79
Aсc. numbеr: 10519415
Benefiсiаry: Cel Rameka
I send the necessary documents to transfer money.
Leаvе a rеply once done or if уou get аny рroblem whilе setting it up.
|22.214.171.124||so254-13.mailgun.net||San Antonio||Texas||US||AS19994 Rackspace Hosting|
|126.96.36.199||hn.kd.dhcp||Zhengzhou||Henan||CN||AS4837 CHINA UNICOM China169 Backbone|
Received: from so254-13.mailgun.net ([188.8.131.52]:60264)
by may mail server with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128)
for email@example.com; Mon, 26 Mar 2018 15:01:15 +0100
DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=solveitlabs.com; q=dns/txt;
s=smtp; t=1522072874; h=Content-Type: MIME-Version: Date: Subject: To:
From: Reply-To: Message-ID: Sender;
Received: from 184.108.40.206 (hn.kd.dhcp [220.127.116.11])
by mxa.mailgun.org with ESMTP id 5ab8fd2a.7fda3c295fb8-smtp-out-n01;
Mon, 26 Mar 2018 14:01:14 -0000 (UTC)
Reply-To: “Go Gards” <firstname.lastname@example.org>
From: “Go Gards” <email@example.com>
Subject: New Direct Debit 6964284 payment to Social Media Drive
Date: Mon, 26 Mar 2018 13:59:24 -0700
Content-Type: multipart/alternative; boundary=”523fce0004854f7fd9330a0794da”
|18.104.22.168||rs234.mailgun.us||US||AS33070 Rackspace Hosting|
|22.214.171.124||LNeuilly-656-1-67-123.w80-11.abo.wanadoo.fr||FR||AS3215 Orange S.A.|
Received: from rs234.mailgun.us ([126.96.36.199]:51539)
by my mail server with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128)
for firstname.lastname@example.org; Mon, 26 Mar 2018 13:54:59 +0100
DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.ckofficedesigns.com;
q=dns/txt; s=k1; t=1522068899; h=Content-Type: MIME-Version: Date:
Subject: To: From: Reply-To: Message-ID: Sender;
Received: from 188.8.131.52 (LNeuilly-656-1-67-123.w80-11.abo.wanadoo.fr [184.108.40.206])
by mxa.mailgun.org with ESMTP id 5ab8eda2.7fd724df6538-smtp-out-n01;
Mon, 26 Mar 2018 12:54:58 -0000 (UTC)
Reply-To: “Luli Norbu” <email@example.com>
From: “Luli Norbu” <firstname.lastname@example.org>
Subject: Pending payment to Ben. Cel Rameka
Date: Mon, 26 Mar 2018 12:52:10 -0700
Content-Type: multipart/mixed; boundary=”72a0e12f3fa189bf6c1a48401267″
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.