An email with the subject of PAYMENT FOR YAREED [ I am assuming random names) coming from random names and email addresses with a malicious word doc attachment delivers some sort of malware via the CVE-2017-0199 (https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0199) word /rtf embedded ole link exploit attack. If you have updated Microsoft Word with the patches to protect yourself against these, then you are safe.
If you have not, then just opening the word doc with no further action on your part, will infect you. I cannot stress strongly enough how vitally important it is to apply these patches IMMEDIATELY from windows update . The attachment is named along the lines of PO NO- <subject name>-2017.doc So when all the names match up in subject, attachment and body of email, it is more likely that a recipient will open the attachment & get infected, because the social engineering aspect of these makes it more believable.
I currently cannot find any actual malware, just an infection chain that appears to end with a download of a genuine version of Putty.exe ( a SSH, Telnet and SFTP client, used for server admin work)
They are using email addresses and subjects that will scare or 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.
Remember many email clients, especially on a mobile phone or tablet, only show the Name in the From: and not the bit in <domain.com >. That is why these scams and phishes work so well.
I have only seen 1 copy so far today myself , but there will no doubt be loads flying around out there.
The email looks like:
Date: Thu 04/05/2017 02:29
Subject: PAYMENT FOR YAREED
Attachment: PO NO- YAREED-2017.doc ( 30kb) and PO NO.- YAREED-2017.doc (7kb)
Payment has been made yesterday as instructed by YAREED
Evidence of payment is attached
Waiting for your early reply
— 本郵件來自HiNet WebMail —
|126.96.36.199||webmsr3.webmail.hinet.net||TW||AS3462 Data Communication Business Group|
|188.8.131.52||114-27-179-12.dynamic-ip.hinet.net||Kaohsiung City||Kaohsiung||TW||AS3462 Data Communication Business Group|
Received: from webmsr3.webmail.hinet.net ([184.108.40.206]:44437)
by knight.knighthosting.co.uk with esmtp (Exim 4.89)
for firstname.lastname@example.org; Thu, 04 May 2017 03:35:18 +0100
Received: from sg1002-ap-3 (172-22-3-3.ip.webmail.hinet.net [172.22.3.3] (may be forged))
by webmsr3.webmail.hinet.net (8.14.2/8.14.2) with ESMTP id v441THfV005073;
Thu, 4 May 2017 09:29:17 +0800
Received: from [220.127.116.11] by sg1002-ap-3
via HTTP with ESMTP id <459415EF36B5A29AFB2C86313B7740F0.worker1@sg1002-ap-3>;
Thu, 4 May 2017 09:29:17 +0800 (CST)
Date: Thu, 4 May 2017 09:29:17 +0800 (CST)
Subject: PAYMENT FOR YAREED
X-Mailer: HiNet WebMail V2.1509a
PO NO- YAREED-2017.doc ( 30kb) Current Virus total detections: Payload Security shows a download of an hta file from http://alguemacultural.com/enessss.hta ( VirusTotal) ( payload Security )
The smaller second word doc also contacts the same location & downloads the same file PO NO- YAREED-2017.doc ( 7kb) Current Virus total detections | Payload Security
This is where it starts to get interesting. The hta file is an executable html file that internet explorer will run
It looks like this, which is an encoded powershell script
which when decoded looks like this which downloads the genuine putty.exe from https://the.earth.li/~sgtatham/putty/0.68/w32/putty.exe which is renamed to nextobad.exe and autorun. That is where I get stuck. None of the online sandboxes are showing anything, but this malware must be using putty.exe to upload or download something, but I can’t yet find out what
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 (https://support.office.com/en-gb/article/What-is-Protected-View-d6f09ac7-e6b9-4495-8e43-2bbcdbcb6653) is enabled and macros are disabled, UNLESS you or your company have enabled them. If protected view (https://support.office.com/en-gb/article/What-is-Protected-View-d6f09ac7-e6b9-4495-8e43-2bbcdbcb6653) 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 (https://support.office.com/en-gb/article/What-is-Protected-View-d6f09ac7-e6b9-4495-8e43-2bbcdbcb6653) 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.
What Can Be Infected By This
At this time, these malicious macros only infect windows computers. They do not affect a Mac, IPhone, IPad, Blackberry, Windows phone or Android phone. The malicious word or excel file can open on any device with an office program installed, and potentially the macro will run on Windows or Mac or any other device with Microsoft Office installed. BUT the downloaded malware that the macro tries to download is windows specific, so will not harm, install or infect any other computer except a windows computer.
You will not be infected if you do not have macros enabled in Excel or Word. These Macros do not run in “Office Online” (https://products.office.com/en-gb/office-online/documents-spreadsheets-presentations-office-online) Open Office, Libre Office, Word Perfect or any other office program that can read Word or Excel files.
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 (https://en.wikipedia.org/wiki/Social_engineering_(security)) 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” (https://support.office.com/en-gb/article/What-is-Protected-View-d6f09ac7-e6b9-4495-8e43-2bbcdbcb6653) 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.