I am seeing a somewhat different to usual AgentTesla malspam campaign this morning. This is using a multistage downloader eventually resulting in the AgentTesla keylogger / infostealer being run on the victim’s computer as a fileless malware.
It all starts with the Word doc attachment, which is actually a RTF file that is using the CVE-2017-11882 equation editor exploit. This calls out to https://bit.ly/2KtVnOo where you are redirected to https://wsdg.net/TECTED.xzz this is a renamed file that the rtf file renames to .exe, which is the downloader for the agent Tesla binary which is downloaded in Base64 encoded format from https://paste.ee/r/tbOr2 and either the original rtf file or more likely, the downloader converts it to a working .exe file. But neither the base64 encoded file or the resulting AgentTesla binary ever appears on the victim’s computer in any format that can be obtained.
At the time of writing there have been 170 prospective victims of this keylogger based on the number of clicks on the bit.ly short url redirection link.
You can now submit suspicious sites, emails and files via our Submissions system
worldwidetradingz.com 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. In fact worldwidetradingz.com does not appear to have a currently live webspace or email service, although they have very recently renewed the domain name.
The email looks like:
From: Ms. H?u <firstname.lastname@example.org>
Date: Fri 21/06/2019 07:12
Subject: PO VIna ES 14916
Attachment: PO VIna ES 14916.doc
Please check the attachment order and confirm the return, thank you.
Then this downloads the base64 encoded file from https://paste.ee/r/tbOr2 | VirusTotal | which is converted to a working .exe | VirusTotal| Anyrun Unusually here, the base64 encoded file & the resulting .exe are different sizes, so something funky is going on here as well.
The AgentTesla binary never actually appears on the victims computer and must be running in memory somewhere.
The word doc looks like this with 26 pages of junk txt
All the alleged senders, companies, names of employees, phone numbers, amounts, reference numbers etc. 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 bad guys choose companies, Government departments and other 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.
This email attachment contains what appears to be a genuine word doc or Excel XLS spreadsheet with either a macro script or an embedded OLE object that when run will infect you.
Modern versions of Microsoft office, that is Office 2010, 2013, 2016 and Office 365 should be automatically set to higher security to protect you.
By default protected view is enabled and macros are disabled, UNLESS you or your company have enabled them. If protected view mode is turned off and macros are enabled then opening this malicious word document will infect you, and simply previewing it in windows explorer or your email client might well be enough to infect you. Definitely DO NOT follow the advice they give to enable macros or enable editing to see the content.
Most of these malicious word documents either appear to be totally blank or look something like these images when opened in protected view mode, which should be the default in Office 2010, 2013, 2016 and 365. Some versions pretend to have a digital RSA key and say you need to enable editing and Macros to see the content. Do NOT enable Macros or editing under any circumstances.
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. Also please read our post about word macro malware and how to avoid being infected by them
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. It might be a simple message saying “look at this picture of me I took last night” that appears to come from a friend. It might be a scare ware message that will make you open the attachment to see what you are accused of doing. Frequently it is more targeted at somebody ( small companies etc.) who regularly receive PDF attachments or Word .doc attachments or any other common file that you use every day, for example an invoice addressed to email@example.com.
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. Many of us routinely get Word, Excel or PowerPoint attachments in the course of work or from companies that we already have a relationship with.
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. A lot of 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”, an invoice or receipt from some company for a product or service or receive a Word doc or Excel file report 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 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.
With these malformed infected word, excel and other office documents that normally contain a vba macro virus, the vital thing is do not open any office document direct from your email client or the web. Always save the document to a safe location on your computer, normally your downloads folder or your documents folder and scan it with your antivirus. Many Antiviruses do not natively detect vba macro-viruses in real time protection and you need to enable document or office protection in the settings. Do not rely on your Anti-Virus to immediately detect the malware or malicious content. DO NOT enable editing mode or enable macros
All modern versions of word and other office programs, that is 2010, 2013, 2016 and 365, should open all Microsoft office documents that is word docs, excel files and PowerPoint etc that are downloaded from the web or received in an email automatically in “protected view” that stops any embedded malware or macros from being displayed and running. Make sure protected view is set in all office programs to protect you and your company from these sorts of attacks and do not over ride it to edit the document until you are 100% sure that it is a safe document. If the protected mode bar appears when opening the document DO NOT enable editing mode or enable macros the document will look blank or have a warning message, but will be safe.
Be aware that there are a lot of dodgy word docs spreading that WILL infect you with no action from you if you are still using an out dated or vulnerable version of word. This is a good reason to update your office programs to a recent version and stop using office 2003 and 2007. Many of us have continued to use older versions of word and other office programs, because they are convenient, have the functions and settings we are used to and have never seen a need to update to the latest super-duper version. The risks in using older version are now seriously starting to outweigh the convenience, benefits and cost of keeping an old version going.
I strongly urge you to update your office software to the latest version and stop putting yourself at risk, using old out of date software.
|18.104.22.168||ictmessmta1.ictmess-orange.ci||Abidjan||Lagunes||CI||AS29571 Orange C�te d’Ivoire|
|22.214.171.124||Montreal||Quebec||CA||AS16276 OVH SAS|
Received: from ictmessmta1.ictmess-orange.ci ([126.96.36.199]:34128) by knmy email serve with esmtp (Exim 4.92) (envelope-from <firstname.lastname@example.org>) id 1heDvg-00085D-Ta for email@example.com; Fri, 21 Jun 2019 08:25:49 +0100 Received: from GWESYALF.host-stage-dns.com (unknown [188.8.131.52]) by ictmessmta1.ictmess-orange.ci (Postfix) with ESMTPSA id 52B83208CAC; Fri, 21 Jun 2019 06:12:28 +0000 (GMT) Content-Type: multipart/mixed; boundary="===============1810061688==" MIME-Version: 1.0 Subject: PO VIna ES 14916 To: Recipients <firstname.lastname@example.org> From: "Ms. H?u" <email@example.com> Date: Fri, 21 Jun 2019 08:12:20 +0200 Message-Id: <20190621061228.52B83208CAC@ictmessmta1.ictmess-orange.ci>
Main object- “PO VIna ES 14916.doc”
Dropped executable file
sha256 C:\Users\admin\AppData\Roaming\0897654.exe 3544fea8710341e48e0dcdc822f0009be5550e1148672774a42d2d0467c2506d