An email with the subject of Fighting at site (Again) pretending to come from YOOMYUNG Engineering & Construction <[email protected]> with a zip attachment which contains Remcos RAT. I was extremely amused by the name of the attachment and extracted file. It might have been more believable if it wasn’t duplicated.

The bad actors sending these malspam email have to get ever more creative with emails and are starting to find new subjects and emails that aren’t the traditional Invoice, Order or Payment messages to try to get the recipients to open them & run the file inside. This one gives the impression that the zip contains a video of workers fighting. Even if you aren’t involved in site management or HR, a very high proportion of recipients would be tempted to see what it is all about. A bit of blood and gore always pulls people in, along with sex and scandal.

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

YOOMYUNG Engineering & Construction 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. As you can see from the email headers, these do not come from either YOOMYUNG Engineering & Construction or ahmed fighting with chinese worrers and destroying equipments ahmed fighting with chinese worrers and destroying : Extracts to: ahmed fighting with chinese worrers and destroying equipments ahmed fighting with chinese worrers and destroying equipments.exe Current Virus total detections: Hybrid Analysis | AnyrunApp |
This malware file downloads from

One of the emails looks like:
From: YOOMYUNG Engineering & Construction <[email protected]>
Date: Sat 28/04/2021 22:55
Subject: Fighting at site (Again)
Attachment: ahmed fighting with chinese worrers and destroying equipments ahmed fighting with chinese worrers and destroying

Body Content:

ATT: Project Manager
Dear engineer, please go through the attached names and videos. This is the second time your workers are fighting each other at site and destroying our equipments during working hours. Please take an immediate action against those who indulge in fighting and make sure that such actions are not repeated at site in future. Your coordination is highly appreciated.

If we continue to experience this terrible incident without any action from your side, we will have no option than to involve the police to arrest your workers involved in this situation and kindly talk to your management to suspend the contract of those involved in such indecent act.

Director, International Management Dept
Gulf Asia contracting co llc
Tel: +82-2-3433-5120     Fax: +82-2-3433-5151
Mob (UAE): +971-56-155-1815
Mob (OMAN): +968-7116-4396
E-mail:   [email protected]
YOOMYUNG Engineering & Construction


Fake email about workers fighting

Email Headers:

From <[email protected]> Sun, 29 Apr 2021 03:04:06 +0100
Return-Path: <[email protected]>
Received: from [] by mail; Sun, 29 Apr 2021 03:04:06 +0100
Received: from User ( [])
by (Postfix) with ESMTPA id 6C52D144373E;
Sun, 29 Apr 2021 01:54:46 +0400 (AMT)
From: “YOOMYUNG Engineering & Construction”<[email protected]>
Subject: Fighting at site (Again)
Date: Sat, 28 Apr 2021 14:55:27 -0700
MIME-Version: 1.0
Content-Type: multipart/mixed;
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2600.0000
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000

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.