Yet another change to the Trickbot Banking Trojan distribution system again today. Today the Trickbot gang are pretending that a scanner or multifunction device is emailing you a scanned document. We used to see this lure all the time from other malware distribution services, but they generally pretended that the email was coming from a device on your network, not a remote server like this example of Trickbot banking Trojan.
This example is an email containing the subject of “Scanned from a Xerox Multifunction Printer ” pretending to come from Xerox Device but actually coming from “firstname.lastname@example.org” which is a look-a-like, typo-squatted or other domain that can easily be misidentified, mistaken or confused with the genuine site, with a malicious word doc attachment is today’s latest spoof of a well-known company, bank or public authority delivering Trickbot banking Trojan.
Using scandevice.uk as the sending email address is quite a stroke of genius from the criminal gang sending these Trickbot banking trojans. The domain name is extremely believable as a generic name that quite easily could be a domain that a printer, scanner or other device could use to send emails to you. Many modern printers, scanners and Multi-function devices do have the facility to email scans or copies to users via whatever email address is set up.
The criminals have continued with the behaviour we have been seeing recently with a very heavily obfuscated, encrypted, encoded macro that downloads the Trickbot banking trojan malware payload from a single location with no fall back download location, unlike previous versions, which normally used 2 locations to deliver the Trickbot banking trojan. Yesterday they used bits.exe to do the download. It looks like a direct download today with no obvious intermediate service or legitimate Microsoft program. It also looks like this horrifically prolific malware is dropping or downloading its own specific version of PowerShell to use in this Trickbot banking Trojan malware campaign. This is being done to bypass the locked down PowerShell tweaks that many companies use that is designed to prevent the inbuilt Microsoft Powershell being used in malware campaigns.
After a bit more digging through the various sandbox reports we can see that this is still using the bits transfer system & PowerShell to perform the Trickbot malware payload download. BUT it is not using the inbuilt Microsoft PowerShell or Bits from the default locations. As far as I can see it drops its own versions of them via the macro & then runs them from the users temp folder.
Update: After further investigations and being prompted in the right direction, I can now see that the system default PowerShell files are copied to the user folder & run from there, so bypassing the need to have system permissions.
It also looks like Trickbot is now reading and probably stealing the log-in data and history from Chrome browser. It might be trying all browsers, but Anyrun is only showing Chrome, which is probably the default browser set up on the sandbox. I cannot see any signs of this behaviour prior to 8th August 2018. It also appears to be reading Firefox preferences but no obvious signs of reading login or browsing data.
You can now submit suspicious sites, emails and files via our Submissions system
From: Xerox Device <email@example.com>
Date: Tue 14/08/2018 11:15
Subject: Scanned from a Xerox Multifunction Printer
Please open the attached document. It was scanned and sent to you using a Xerox Multifunction Printer.
Sent to: firstname.lastname@example.org
Attachment File Type: doc, Multi-Page
Multifunction Printer Location:
Device Name: XRX9C934E931521
No Xerox device has been hacked or had their email or other servers compromised. They are not sending the emails to you.
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.
- scandevice.uk hosted on & sending emails via 188.8.131.52| 184.108.40.206 |220.127.116.11| 18.104.22.168|
The folder for the files & configs is: C:\Users\[User]\AppData\Roaming\vcmsd
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” 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.
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.
Email from: email@example.com