Continuing with the recent changes to the Trickbot delivery system and possibly the payloads and configs today.
This example is today’s latest spoof or imitation of a well-known company, bank or public authority delivering Trickbot banking Trojan. The email with the subject of ” FW: Company Complaint #DNBC920201TF” pretends to come from Dun & Bradstreet but actually comes from “email@example.com” which is a look-a-like, typo-squatted or other domain that can easily be misidentified, mistaken or confused with the genuine site. These have a malicious office file attachment. Today they are using macro enabled word docs that fire off on both open & close.
These are primarily aimed at US recipients. The email I saw was blank when opened in Outlook. It looks like the bad actors have messed up the CSS formatting so Outlook will not display the content properly.
Dun & Bradstreet 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 the genuine Company, Bank, Government Department or message sending service. Normally there is only one newly registered domain that imitates a well known Company, Government Department, Bank or other organisation that can easily be confused with the genuine body or website in some way. These are hosted on & send the emails from 3 or 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.
- dnbcomplaint.com hosted on & sending emails via 220.127.116.11 | 18.104.22.168 | 22.214.171.124 | 126.96.36.199 |
You can now submit suspicious sites, emails and files via our Submissions system
From: Dun & Bradstreet <firstname.lastname@example.org>
Date: Wed 06/03/2019 18:12
Subject: FW: Company Complaint #DNBC920201TF
DnB Company Complaint
Dun & Bradstreet has received the above-referenced complaint from one of your customers regarding their dealings with you. The details of the consumer’s concern are included on the reverse. Please review this matter and advise us of your position.
In the interest of time and good customer relations, please provide the DnB with written verification of your position in this matter by March 15, 2019. Your prompt response will allow DnB to be of service to you and your customer in reaching a mutually agreeable resolution. Please inform us if you have contacted your customer directly and already resolved this matter.
The Dun & Bradstreet develops and maintains Reliability Reports on companies across the United States and Canada . This information is available to the public and is frequently used by potential customers. Your cooperation in responding to this complaint becomes a permanent part of your file with the Dun and BradStreet. Failure to promptly give attention to this matter may be reflected in the report we give to consumers about your company.
We encourage you to print this complaint (attached file), answer the questions and respond to us.
We look forward to your prompt attention to this matter.
Dun & Bradstreet Credibility Corp. 103 JFK Parkway, Short Hills, NJ 07078
Screenshot as it arrived in Outlook
Screenshot as displayed when opened in a browser or webmail client
There are lots of changes to the Trickbot delivery system and possibly the payloads and configs today. As usual it starts with a Macro enabledword doc attached to the email.
This is where it starts to be quite different to previous Trickbot campaigns & delivery methods. Firstly the macro fires off on open & close. The macro drops several .bat files ( velofiba*.bat, where * is 1-4 ) into user/temp that contain all the instructions to download & run the malware payload. It then copies the system bitsadmin.exe from windows system folder to user/temp folder under a different name, ld0CIC0.exe ( this is done because several security tools or company settings try to block the system bitsadmin from running to try to prevent silent malware downloads) & runs that to call out to one of the download sites, where it downloaded a very small .exe file and multiple other binary files which are then combined together to create the Trickbot payload. However a direct call to the url in question, not using bitsadmin will give the full binary.
There is only 1 download location for the trickbot binary today.
The folder for the files & configs is: C:Users[User]AppDataRoamingwnetwork
It then downloads alternate versions of itself
http://188.8.131.52/table.png VirusTotal |
http://184.108.40.206/radiance.png VirusTotal |
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.
Main object- “DNBC920201TF.doc”
Dropped executable file
sha256 C:\Users\admin\AppData\Local\Temp\ld0CIC0.exe 2990813e869a0a5c7706938a8136bca09046623a8225b24b54f76ac4126efbb0
sha256 C:\Users\admin\AppData\Roaming\wnetwork\gepde.exe 0a43e3618a979e9dddb637ab2ddace660c7961b31534a945e30839ccaf3acf0c
sha256 C:\Users\admin\AppData\Roaming\wnetwork\log_install.tmp 4ed1c16332d82a62caaeaadcae3a69ed360d60e8ceafdc780865a68913a58b97
Email From email@example.com