Trojan:W32/Trickbot

The Trickbot trojan tries to steal the login credentials for specific banks in specific countries, with the list of targeted banks changing regularly. More information about Trickbot's latest targets can be found at:

• F-Secure Weblog (13 Jun 2017): TrickBot Goes Nordic Once In A While

Delivery

The operators behind the Trickbot trojan usually distribute the malware as an file attached to spam email messages. As with most such messages, the content of the email is designed to look legitimate so that the user is lured into opening the attachment. Doing so runs a script embedded in it, which then downloads the Trickbot trojan from a remote server, installs and runs it on the computer.

More rarely, Trickbot may be delivered as the payload of an exploit kit. In that case, the trojan itself is silently dropped, installed and run on the affected machine.

Stealing bank site passwords

The Trickbot trojan can use either of two techniques to trick the user into unwittingly giving away their login credentials.

The first technique (known as static injection) involves replacing the banking site's legitimate login page with a fake one that looks almost exactly like it. The second technique (known as dynamic injection) redirects the web browser to a server under the trojan's operator's control whenever the user enters the URLs for the targeted banking sites.

In either case, if the user enters their login details on the fake page, the information is captured and sent to the operators. The stolen data may then be used to commit financial fraud.