Even More Fake Santander Bank Invoices Delivering Trickbot

Trickbot via Fake Companies House E-billing

This example is an email containing the subject of “FW: Invoice” pretending to come from Santander Bank but actually coming from a look-a-like or typo-squatted domain “Diana.Braser@santander-invoice.co.uk” with a malicious word doc attachment is today’s latest spoof of a well-known company, bank or public authority delivering Trickbot banking Trojan.

Once again today these are pretty grotty plain text emails that shouldn’t fool anybody in the slightest and don’t look anything even vaguely like a genuine Santander Bank email. It is almost as if the criminal gang sending these are just going through the motions to fulfil a quota rather than with any real desire to be realistic or get victims.

You can now submit suspicious sites, emails and files via our Submissions system

Email Details

From: Santander Invoice <Diana.Braser@santander-invoice.co.uk>

Date: Fri 29/06/2021 11:58

Subject: FW: Invoice

Attachment: invoice.doc

Body Content:

Hello,
We did not receive your payment.
Best Regards,
Diana Braser

Screenshot:

Fake Santander Bank Invoice Email

Santander Bank 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.

What has happened is that the criminals sending these have registered various domains that look like genuine Company, Bank, Government or message sending services. Normally there is only newly registered domain that imitate Companies House, HMRC, another Government department, a Bank, file hosting service or a message sending service that can easily be confused with the genuine organisation in some way, that are hosted on & sending emails from 4 different servers. Some days however we do see dozens or even hundreds of fake domains.

Today’s example of the spoofed domain is, as usual, registered via Godaddy as registrar. Because of new GDPR rules we cannot easily find the registrants name or any further details.

santander-invoice.co.uk hosted on & sending emails via 213.5.71.73 nld-net-ip.as51430.net NL AS51430 AltusHost B.V.| 95.211.155.235 NL AS60781 LeaseWeb Netherlands B.V.|91.218.125.170 hosted.by.serveo.nl NL AS50673 Serverius Holding B.V. | 191.101.26.35 Edmond Oklahoma US AS20454 SECURED SERVERS LLC |

Malware Details

invoice.doc Current Virus total detections | Hybrid Analysis | Anyrun |

This malware doc file downloads from http://srienterprises.net/lop.bin which is a renamed .exe file ( VirusTotal) Gtag Ser 0629

The alternate Download location is http://nlfashionbd.biz/lop.bin

Continuing today with C:\Users\<user name>\AppData\Roaming\sysmon as folder for files & configs / modules

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 spreadsheet 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, macros and DDE “exploit /Feature” and embedded ole objects 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. If the protected mode bar appears when opening the document DO NOT follow the advice they give to enable macros or enable editing to see the content. The document will have a warning message, but you will be safe.

Be aware that there are a lot of other 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 outweighing the convenience, benefits and cost of keeping an old version going.

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, embedded Oles or DDE 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

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.

IOC:

invoice.doc
MD5: f69dbd05e72baff642f4c9b19df65b8a
SHA-1: df32a103eb35d9b1eee0611f306bbfad5f9cb4a3
Download URLs
http://srienterprises.net/lop.bin 134.119.189.10
http://nlfashionbd.biz/lop.bin 50.3.234.101
MD5: 54bc795028a9a3f1467d8ba8a3f1f5a2
SHA1: e5f7ba4baeb7bd0beef022c7535c071ab2c7d89d

Email from: Diana.Braser@santander-invoice.co.uk
95.211.155.235
213.5.71.73
91.218.125.170
191.101.26.35

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