A slightly less usual malware delivery method to start this week.
An email with the subject of EFT- 407808-716 [ probably random numbered] pretending to come from Business Central Darlington | Office Space Darlington but actually coming from <firstname.lastname@example.org> ( which appears to have been compromised) with a series of identical links in the email which downloads a zip file via FTP
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.
You can now submit suspicious sites, emails and files via our Submissions system
The link in the email goes to “ftp://OceanBell:email@example.com/100-48573888-494y775.zip” which is an ftp link that contains the user name & password needed to download the file.
This js file contains an embedded .exe which is extracted /dropped as Tempa.exe ( VirusTotal) which then uses attrib -h -r -s command to hide, set as system file & make read only so it becomes difficult to delete & can’t be easily seen by any victim looking for it.
Somewhere along the line a dll is dropped to C:\Users\user name\AppData\Roaming\Microsoft\Windows\Messageve\Trueweb.dll ( VirusTotal) which gives indications of being some sort of banking trojan.
I have absolutely no idea what malware this is. But I have a gut feeling it is related to Dridex banking trojan. Virus Total gives a spectacular 0 hits on the js file. and barely any better on the dropped.exe. I have only received 1 copy so far , so I don’t think this is currently a high volume campaign.
One of the emails looks like:
From: Business Central Darlington | Office Space Darlington <firstname.lastname@example.org>
Date: Mon 11/06/2018 12:01
Subject: EFT- 407808-716
Payout information Thank you for your recent payout enquiry. I have attached the relevant letter to this e-mail as requested.
Also included below is some important information that relates to the processing of payout transactions. Please take the time to read the entire e-mail as it will be helpful if you decide to payout the contract by the expiry date shown.(EFT)
Bank: HSBC UK
Account name: NatWest
BSB:Displayed in the attached letter
Account number: Displayed in the attached letter
|220.127.116.11||smtpcmd01230.aruba.it||Arezzo||Tuscany||IT||AS31034 Aruba S.p.A.|
|18.104.22.168||webxmaildh03.aruba.it||Arezzo||Tuscany||IT||AS31034 Aruba S.p.A.|
Received: from smtpcmd01230.aruba.it ([22.214.171.124]:54860)
by My Mail Server with esmtp (Exim 4.91)
for email@example.com; Mon, 11 Jun 2018 12:00:43 +0100
Received: from gierreservice.com ([126.96.36.199])
by smtpcmd01.ad.aruba.it with bizsmtp
id xP0g1x0254cXiTA01P0iUU; Mon, 11 Jun 2018 13:00:43 +0200
Date: Mon, 11 Jun 2018 13:00:40 +0200
Subject: EFT- 407808-716
From: “Business Central Darlington | Office Space Darlington”
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aruba.it; s=a1;
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.