Today’s Locky/ Zepto ransomware malspam emails have come steadily in waves all day long. There have been 2 distinct different subjects and themes. one pretending to be a voice message from your own email domain or company, with the second pretending to be an audit report from a random company.
The first is an email with the subject of [Vigor2820 Series] New voice mail message from 01443281097 on 2016/08/23 21:01:59 [ random telephone number and date/time] pretending to come from voicemail @ your own email address with a zip attachment named something like Message_from_01443281097.wav.zip where the attachment number matches the telephone number in the subject line
Update 8 September 2016: Another big malspam run of the vigor2820 series voice message with what looks like quite a significant change to the dropped malware. I am getting it all analysed but a preliminary analysis with all submitted and discovered files withheld by the uploader is at Payload Security . I have submitted a different version to them and will update when the results come back. new version VirusTotal | Payload Security  
Update 25 November 2016: Another massive malspam run today. Message_from_01424948038.wav.zip extracts to 98220186.js ( VirusTotal) MALWR shows a download of an encrypted file from http://supplyglassess.com/yr387n3?CgggJY=CgggJY which is converted by the script to CgggJY1.dll and autorun ( VirusTotal ) Payload Security
The Vigor 2820 Series is an older ADSL Router Firewall aimed at small business users, so we can quite easily see that this campaign of malware spreading is directly aimed at the small business user who probably hasn’t got good security policies in place and will be more likely to have employees that are used to voice messages being left and can easily fall for this social engineering method of infecting the company with Locky /Zepto Ransomware..
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.
Your, your email provider or your company have 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
One of the emails looks like:
From: voicemail @ your own email address
Subject: [Vigor2820 Series] New voice mail message from 01443281097 on 2016/08/23 21:01:59
Dear rob :
There is a message for you from 01443281097, on 2016/08/23 21:01:59 .
You might want to check it when you get a chance.Thanks!
The second campaign has a subject of Audit Report coming from random senders with a content looking like the below. The name in the body of the email matches the spoofed sender
One of the emails looks like:
From: Omer Scott <Scott.firstname.lastname@example.org>
Date: Tue 23/08/2016 15:3
Subject: Audit Report
The audit report you inquired is attached in the mail. Please review and transfer it to the related department.
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.
23 August 2016 : Message_from_01443281097.wav.zip : Extracts to: 44077640409.wsf Current Virus total detections: MALWR shows a download of an encrypted file from either http://danzig.vtrbandaancha.net/HJghjb54?PqzwogvtP=xYWWDkr or http://backyard004.web.fc2.com/HJghjb54?PqzwogvtP=xYWWDkr ( in this example) which gets converted by the script to wKoYWwOtQ.exe ( VirusTotal)
23 August 2016 : 83543cd11db.zip : Extracts to: audit report 316dd5a1.js Current Virus total detections: MALWR shows a download of an encrypted file from either http://sb-11856.fastdl-server.biz/688dak3, http://newt150.tripod.com/idyeb9 or http://dl.sevenseals.ru/ehaq1zw ( in this example) which gets converted by the script to NCPcpOkuUfr5AA0.dll ( VirusTotal)
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 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.