SophosLabs is intercepting a widespread malware attack, spammed out via email, posing as a secure message.
The emails, which have the subject line of "You have received a secure message", attempt to trick recipients into opening an attached ZIP file.
However, contained inside the ZIP file - securedoc.zip - is a Trojan horse that Sophos products detect as Troj/Zbot-DPM.
Here is what a typical message looks like (click on the image for a fuller version):
You have received a secure message
Read your secure message by opening the attachment, SECUREDOC. You will be prompted to open (view) the file or save (download) it to your computer. For best results, save the file first, then open it.
If you have concerns about the validity of this message, please contact the sender directly. For questions about Key's e-mail encryption service, please contact technical support at 888.764.7941.
First time users - will need to register after opening the attachment.
Help - https://mailsafe.keybank.com/websafe/help?topic=RegEnvelope
About IronPort Encryption - https://mailsafe.keybank.com/websafe/about
The notorious ZBot family of malware (also known as Zeus) can hijack your computer, making it part of a criminal botnet. Over the past few years cybercriminals have used different versions of ZBot to steal money from online bank accounts, login details for social networking sites and email/FTP information.
It's easy to understand why recipients might be duped into believing that they have really received a secure message like the one shown above, and might be fooled into opening the attachment, and running the malicious executable contained within.
SophosLabs is seeing many of these messages spammed out at the moment - so please check that your anti-spam and anti-virus defences are updated, and capable of detecting this threat.
And always think carefully before opening an unsolicited email attachment.Follow @gcluley