Overdue invoice #1197419584 is another one from the current bot runs which try to download various Zbots, cryptolocker, ransomware and loads of other malware on your computer. They are using 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.
Almost all of these also 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.
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.
Today’s emails are randomly selecting different file attachments. All of them pretend to come from random names @ random company names Some have a standard zip with a spoofed word .doc inside the zip. Some have an arj file as the attachment. This sort of compressed file is rarely used nowadays and many popular zip file programs will not automatically extract them. They all have random invoice numbers. In some cases the invoice number in the subject line matches the malware attachment name, but not always.
All the alleged senders, companies, names of employees and phone numbers mentioned in the emails are all innocent and are just picked at 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 email looks like:
I was hoping to hear from you by now. May I have payment on invoice #1197419584 today please, or would you like a further extension?
+07540 61 15 69
or like this one
This email contains an invoice file in attachment.
10 September 2021: bill_2021-09-10_09-16-23_1197419584.arj : Extracts to: bill_2021-09-10_09-16-23_1197419584.exe Current Virus total detections: 6/55
Alternative version 10 September 2021: Invoice4777_2C7.zip : Extracts to: attachment_scaned.doc .exe Current Virus total detections: 2/54
This Overdue invoice #1197419584 is another one of the spoofed icon files that unless you have “show known file extensions enabled“, will look like a proper Microsoft word.doc file instead of the .exe 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. Most ( if not all) 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, you can easily see if it is a picture or document & not a malicious program. If you see .EXE or .COM or .PIF or .SCR 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.