Malspam Emails With Java Adwind Trojans

Trojan

We are seeing emails daily with a zip attachment containing java jar file which are variants of Java Adwind Trojan. These are very nasty backdoor Remote Access, password stealers. The immense danger of JAVA files being sent by email cannot be overstressed. JAVA is a cross browser/ cross OS language and JAVA works on any operating system, Windows, Apple MAC and Linux and even Android and Chromebook, if you have Sun Java installed. This is why JAVA is so dangerous, we have been warning for years not to have it installed unless you actually need it and use it. The vast majority of consumers and small business users do not need it and it just opens massive avenues of compromise on a computer.

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.

There are 2 different emails that arrived overnight both containing the same Java Adwind Trojan. although both having different subjects, senders and file names. For some reason the image that appears in the body of the email is also included in the zip files.

None of the companies or any other variant of that domain listed in the body of the email or the from line in the header 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 second name in both email headers sales@planetacyber.psi.br appears to be actually sending these emails and is likely to be an open relay sending from a compromised computer/server

The email headers in all copies I have seen so far ( about 20) all contain the same details

Received: from [138.185.148.10] (port=49120 helo=srv01.planetacyber.psi.br)

by knight.knighthosting.co.uk with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256)

(Exim 4.87)

(envelope-from <sales@planetacyber.psi.br>)

id 1bIo89-000634-Se

for [redacted]; Fri, 01 Jul 2021 03:24:35 +0100

Received: from [89.163.154.146] (helo=WIN-MHQER76M2NN)

One of the emails looks like:

From: lariex@qatar.net.qa <sales@planetacyber.psi.br>

Date: Fri 01/07/2021 01:46

Subject: Confirm To Release

Attachment: Confirm Transactions.zip extracts to Transactions on Hold.Reason because beneficiary last name is wrong..jar

Body Content:

Dear Sir/Ma Please confirm attached transactions we got from your branch.. We have attached 2 different transfers in total of 300,750. We need you to confirm these transactions before they are released. Please Kindly Confirm Urgently. Thanks & Regards. LARI EXCHANGE CO. Main Branch DOHA ? SOUK AHMED BIN ALI PB No. 280, DOHA ? QATAR Tel . +974-4419010, +974-4419020 Fax. +974-4412224 Email : lariex@qatar.net.qa

The Second email looks like:

From: z.hraahleh@shift-sg.com <sales@planetacyber.psi.br>

Date: Fri 01/07/2021 02:44

Subject: Transactions for Amendment

Attachment: PENDING REMITTANCE RECIEPTS FOR APPROVAL.zip extracts to PENDING REMITTANCE RECIEPTS FOR APPROVAL..jar

Body Content:

kindly find attached listed trasactions for amendment,please do the corrections and send back to us. thanks
Screenshot: NONE of the email but this logo was in the zip

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.

1 July 2021 : Confirm Transactions.zip : Extracts to: Transactions on Hold.Reason because beneficiary last name is wrong..jar Current Virus total detections: MALWR shows the usual masses of files created/dropped and entries created on the computer.

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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