Regarding A Career! Fake Resume Malspam Delivers Sigma Ransomware

Regarding A Career! Fake Resume Malspam Delivers Sigma Ransomware

I haven’t seen any examples of this Resume malware for a while now, so when this popped up in my spam folder, it looked interesting enough to investigate a bit more. This is a continuation from these 4 previous posts about malware using resumes or job applications as the lure. [1] [2] [3] [4]They have changed behaviour again since that post was written and it is time to once again update the details.

The primary change in delivery method is once again the use of a password for the word doc to try to bypass antivirus filters. However there does appear to be big differences in the malware itself to previous versions.
Today’s version does not appear to be using Smoke Loader /Sharik trojan as an intermediate downloader for other malware, which has been the previous behaviour with these fake resume emails. Instead it appears to download Sigma ransomware directly.

I have had major problems analysing these today. Either I am too stupid to work out how to insert passwords on the majority of sandbox systems or their documentation & instructions leaves something to be desired. The only way I can ever get a password protected word doc to run is to use Anyrun app which interactively allows me to insert the password, in the same way a “normal” recipient would.

Next the actual malware downloaded was so slow to download that AnyrunApp couldn’t retrieve it. it took just over 3 minutes to download directly for me

I gave up trying to insert the password in the sandboxes so removed it from the word doc & uploaded a “fixed” copy with no password to all sandboxes except anyrun. I still couldn’t get it to run in Cape sandbox . HA and Anyrun gave the same error about “cannot locate the resource specified)
( fixed) Meriwether Resume.doc Current Virus total detections: Hybrid Analysis | AnyRun ( original unfixed doc) |

This malware downloads from http://104.250.151.119/troll.bin VirusTotal | Hybrid Analysis | Anyrun Beta |Cape Sandbox | HA is the only sandbox that actually shows the ransomware working

This ransomware downloads the Tor browser to the victim’s computer to be used.

The malware IP 104.250.151.119 is “owned” by GORILLASERVERS.COM. Who I can’t find much information about.
An email with the subject of Regarding a career! coming from Meriwether <0240@typesettingsforyou.com> ( probably random names) with a malicious password protected word doc attachment delivers Shade /Troldesh Ransomware.

They are using email addresses and subjects that will scare, shock, persuade or entice a user to read the email and open the attachment. These are generally targeted at small or medium sized businesses, small charities or organisations who might not have enterprise level protections against this sort of malware delivery method. In today’s current jobs climate, it is extremely common to get resumes or job applications out of the blue. These are just generic enough and just about believable so that a busy, hardworking HR department or General Office dogsbody in a small organisation could be tempted to look at the word doc to see if the details matched the company requirements, before replying.

Possibly the criminals spreading these look for websites that do post job or volunteer positions. The email address this was sent to is a very busy UK Wildlife rescue charity that is currently advertising for volunteers.
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.

The email looks like:

From: Meriwether <0240@typesettingsforyou.com>
Date: Fri 09/03/2018 05:17
Subject: Regarding a career!
Attachment: Meriwether Resume.doc

Body Content:

Hey there! I hope you are well!
I am definately interested in a opening.
See my attached CV and get back to me as soon as possible!
The file is password protected to protect against identity theft. The password is “resume”
Looking forward to hearing back from you!
Meriwether

Screenshot:

Fake Resume email

Email Headers And Website Details:

typesettingsforyou.com was registered in either January or February 2018 ( I can’t tell if US dates or UK dates are on whois lookup ) using privacy protection via Namecheap.com as registrar. It appears to be hosted by OVH on 66.70.229.128 with SPF and DKIM authentication set up allowing it to send emails from any IP address inside the 66.70.229.0/24 range). Couple this with the fact there is no website set up on the IP address , This suggests that the domain has been set up to be used in these fraud & malware spreading campaigns.

66.70.229.137 mta137.typesettingsforyou.com Saint Louis Missouri US AS16276 OVH SAS

Received: from mta137.typesettingsforyou.com ([66.70.229.137]:37504)
by knight.knighthosting.co.uk with esmtp (Exim 4.89_1)
(envelope-from <0240@typesettingsforyou.com>)
id 1euAPr-0000QT-AM
for info@victimsdomain.com; Fri, 09 Mar 2018 05:18:03 +0000
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=bulk; d=typesettingsforyou.com;
h=Date:Subject:From:To:MIME-Version:Content-Type:Message-ID; i=0240@typesettingsforyou.com;
bh=qJJ7O42WPZbrLQyKBP/7qj4CmKs=;
b=lbFPd9glClI0iHWmiQh6VNHeoChYv2tisUJx83JrtNQOYLufaCv6C7+pEHxlb0L8Oq3iP9nMlwrB
aA7kJmEx1UWmPZ5v8FFpk7UBEoT2FXK4a9rx94V/lo3sb7OwlTkEwXF/+fItHLFoLpFWBGAsF2+9
/hgApBPDANHrW3vrMzU=
DomainKey-Signature: a=rsa-sha1; c=nofws; q=dns; s=bulk; d=typesettingsforyou.com;
b=PNHhxL0O+reC+Vzu+DAUnTnZJs7dMFU1as7Rn5jRDptTihJVF7zcvV+mIjnKGA0QY3BPoIF3hkxt
K8FjT+L86SFPY+hFeE4nGg5W2pLHvCwjujSLlt23uq7rbACFy7bV34jcEJlaBX/jfmQGKPJCdF9t
sg9DFWR1VIMFOWUMqs8=;
Date: Fri, 9 Mar 2018 06:17:26 +0100
Subject: Regarding a career!
From: “Meriwether” <0240@typesettingsforyou.com>
To: info@victimsdomain.com
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary=”–_com.android.email_77620466264711″
Message-ID: <psnpz18-voxgc5-46@typesettingsforyou.com>

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.
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 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 sales@victimcompany.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.

Derek

Derek