Necurs Botnet Malspam Delivering A New Ransomware Via Fake Scanner /Copier Messages

Office Macro Malware

We have had an almost 2 week break from Locky ransomware. This morning in UK we suddenly see the return. It is almost as if they have timed the new version to spam out on Thanksgiving day in USA , where the AV companies and security teams are off on their long weekend holiday. The next in the never ending series of downloaders from the Necurs botnet is an email with the subject of scanned from ( printer or scanner name) pretending to come from copier@ your own email address or company domain.

However it is definitely a ransomware but doesn’t look like Locky. The ransom note is very different . These all have blank email bodies with just an attachment and the subject. Whether this is a new version of Locky ransomware or a new ransomware using the Locky / Necurs distribution networks is open to debate at the moment
Update I am being told it is Scarab Ransomware.

Looking at the Online sandbox reports appear to indicate that these do not change the file extension when they encrypt it, however that appears to be a limitation of a VM or online sandbox. Other researchers testing on real systems have shown the added extensions.

I am not certain that there are running properly and fully encrypting. The ransom note is overly complicated with no obvious way for the victim to easily pay the ransom. They are asking the victim to email with the personal identification key in the txt file. This would mean it needs manual sending of any decryption keys and not automatic as in previous cases.

The new ransom note is called IF YOU WANT TO GET ALL YOUR FILES BACK, PLEASE READ THIS.TXT
They use email addresses and subjects that will entice, persuade, scare or shock a recipient to read the email and open the attachment.

You, your email server or any device on your network 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.

The subjects in this vary but are all copier or scanner related

  • Scanned from Lexmark
  • Scanned from HP
  • Scanned from Canon
  • Scanned from Epson

 

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

image2017-11-23-4360760.7z : Extracts to: image2017-11-22-5864621.vbs Current Virus total detections: Hybrid Analysis | Anyrun Beta | Joesecurity |
This downloads from ( in this example, there will be dozens of other download sites) http://pamplonarecados.com/JHgd476? ( VirusTotal)
One of the emails looks like:
From: copier@victimsdomain.com
Date: Thu 23/11/2021 06:28
Subject: Scanned from HP
Attachment: image2021-11-23-4360760.7z

Body Content:

EMPTY

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.

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. 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.

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. Y

ou 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.

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