We haven’t seen any Formbook malware / Trojan / Info-Stealer hitting the UK for ages, so it was quite surprising to see this one arrive overnight. Unlike previous versions who generally used exploits or macros / embedded ole objects in Microsoft Office to deliver the payload, this is a simple .exe file inside a zip that pretends to be an Excel Spreadsheet if you don’t have “show known file types” enabled in windows, so making it more likely for an unsuspecting user to click on it & open & run the file.
As usual for Formbook, as soon as the file is run it automatically deletes itself and creates a new copy in the “user\appdata\temp” folder where it runs without alerting the user.
It creates dozens of .ini files and screenshots containing the stolen info in user\roaming\<random name >. As usual there are dozens of “fake” C2 sites where the stolen info is allegedly sent to and 1 working C2. I cannot easily determine the working C2 today.
You can now submit suspicious sites, emails and files via our Submissions system
I don’t think anasports.kr have 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 SPF settings on their server basically allow any sender to send emails on their behalf because they use the “~” soft fail ( Quarantine or accept setting) rather than “-” hard fail which means reject email if SPF doesn’t match. The emails are coming form another Korean IP number
One of the emails looks like:
From: KIM HYUN <firstname.lastname@example.org>
Date: Thu 25/07/2019 23:37
Subject: Fw: NEW ORDER
I am resending our purchase order. Please issue us your PI immediately.
specification and quantity needed are listed.
We plan on making payment asap because we want goods shipped out soonest.
Your early reply is highly appreciated. Thank You!
Kim Lee Hyun
Export Area Manger
1469-7, Songjeong-Dong, Gangseo-Gu, Pusan
Tele: + 82-51-971-9101
Fax: + 82-51-831-8490
|22.214.171.124||webmail38.godo.co.kr||KR||AS3786 LG DACOM Corporation|
Received: from webmail38.godo.co.kr ([126.96.36.199]:42513) by my email server with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.92) (envelope-from <email@example.com>) id 1hqmQl-0003xm-WC for firstname.lastname@example.org; Thu, 25 Jul 2019 23:41:52 +0100 Received: (qmail 15797 invoked by uid 99); 26 Jul 2019 07:37:03 +0900 Message-ID: <email@example.com> From: "KIM HYUN" <firstname.lastname@example.org> Reply-To: "KIM HYUN" <email@example.com> To: firstname.lastname@example.org Subject: =?ks_c_5601-1987?B?Rnc6ICBORVcgT1JERVI=?= Date: Fri, 26 Jul 2019 07:37:03 +0900 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_fcb7b7c47244f145b52963afbf10f3ca" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: fox_mail
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.
Main object- “PO-HN825201911.exe”
Dropped executable file
sha256 C:\Users\admin\AppData\Local\Temp\Eyty0dht\hncxqrt8cpxdcfj.exe 46a1651749ae9b0133da3b5a0bcd0194f19060789cb8edec2d2783603c8255b0