An email with the subject of Quotation coming from what appears to be a compromised email account or web server email@example.com with a zip attachment which contains an unknown malware. I am guessing it is some sort of password stealer or keylogger. ( I am being told it is Agent Tesla keylogger)
I can’t fully work out what this malware is or does. Running it in the various online sandboxes is not giving much helpful information. It drops a small file htc.exe which continually crashes in Anyrun. Other sandboxes show the file as a different name, so it obviously randomises the name on each system. It definitely appears to have numerous anti-analysis techniques and protections and looks like it won’t run properly in a sandbox or VM.
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.
If you look at the email headers, this is coming from geamedical.com and appears to be coming via the webmail service on that domain. It is likely that the credentials used to log in & send these malspam emails have been previously stolen by the criminals.
One of the emails looks like:
Date: Wed 31/01/2018 18:17
With regards to the enclosed quotation, please submit your invoice along
with your bank details to our Accounts Department, for the payment
Bo’s Furniture Consignment & U-Haul
3626-F Apalachee Parkway
Tallahassee, FL 32311
The file shows “interesting” properties
|184.108.40.206||smtp101.orion.net.id||Jakarta||Jakarta||ID||AS24523 Orion Cyber Internet|
|220.127.116.11||hosting.orion.net.id||Jakarta||Jakarta||ID||AS24523 Orion Cyber Internet|
Received: from smtp101.orion.net.id ([18.104.22.168]:43178)
by knight.knighthosting.co.uk with esmtp (Exim 4.89_1)
for firstname.lastname@example.org; Wed, 31 Jan 2018 18:17:22 +0000
Received: from hosting.orion.net.id (hosting.orion.net.id [22.214.171.124])
by smtp101.orion.net.id (Postfix) with ESMTPS id F420D41E6C;
Thu, 1 Feb 2018 01:20:53 +0700 (WIB)
DMARC-Filter: OpenDMARC Filter v1.3.2 smtp101.orion.net.id F420D41E6C
Authentication-Results: smtp101.orion.net.id; dmarc=none (p=none dis=none) header.from=geamedical.com
Authentication-Results: smtp101.orion.net.id; spf=none email@example.com
DKIM-Filter: OpenDKIM Filter v2.11.0 smtp101.orion.net.id F420D41E6C
Received: from [::1] (port=58702 helo=webmail.geamedical.com)
by hosting.orion.net.id with esmtpa (Exim 4.89_1)
id 1egwvy-0002u3-Di; Thu, 01 Feb 2018 01:16:34 +0700
Date: Thu, 01 Feb 2018 01:16:33 +0700
User-Agent: Roundcube Webmail/1.3.3
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 details, 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.
Previous campaigns over the last few weeks have delivered numerous different download sites and malware versions. There are frequently 5 or 6 and even up to 150 download locations on some days, sometimes delivering the exactly same malware from all locations and sometimes slightly different malware versions. Dridex /Locky does update at frequent intervals during the day, sometimes as quickly as every hour, so you might get a different version of these nasty Ransomware or Banking password stealer Trojans.
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.