Order Confirmation nnnnnn Malspam With A Dzip Attachment Delivers Locky

Office Macro Malware

The next in the never ending series of Locky downloaders is an email with the subject of Order Confirmation 9226435 [random number]coming as usual from random companies, names and email addresses with a random named zip attachment containing an HTA file

However this will confuse and alert most recipients because the Locky gang have really messed up today. The attachment comes as a dzip file. dzip is not a known file extension. It is likely that in their rush to get the malware out before the weekend, some fat fingered “apprentice” mistyped the file name and extension. Although dzip is not known WinZip & most other extraction tools will unzip it, although not from a double click. you need to use the main program interface not the right click context menu in windows explorer.

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.

One of the emails looks like:

From: Meagan carnochan <Meagan4@insightsundertwo.com>

Date: Fri 09/09/2021 09:01

Subject: Order Confirmation 9226435

Attachment: Ord9226435.dzip extracts to 2021jozE.hta

Body Content:

This message is intended only for the individual or entity to which it is

addressed and may contain information that is private and confidential. If

you are not the intended recipient, you are hereby notified that any

dissemination, distribution or copying of this communication and its

attachments is strictly prohibited.

Screenshot:

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.

9 September 2021: Ord9226435.dzip : Extracts to: 2021jozE.hta Current Virus total detections: Payload Security shows a download of an encrypted file from walkerandhall.co.uk/7832ghd?TtrISozIzi=CemUQBnTyeQ| which is transformed by the script to a working locky version. Unfortunately Payload security isn’t showing the converted /decrypted file amongst the downloads although the screenshots definitely show locky

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.

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