The BKA/Ransom Trojan comes now with child pornography

The so called “BKA Trojan” (BKA stands for German Federal Criminal Police) malware which is also known as the Ransom trojan in other countries, has found a more convincing way to fool computer users to pay. Now, together with other eight possible misdeeds,  the user is accused of hosting and distributing child pornography materials from his computer. The computer is identified via IP address and geo-ip location (see top right corner).

Same as the other variants known, the malware locks the user’s computer and asks 100€ (135 USD) to be paid via UKash or paysafe in order to unlock the computer, not destroy the data on it and not be condemned and punished. The cybercriminals are constantly trying new texts in order to look as convincing as possible.

The malware is distributed via drive by downloads as an executable file with temporary names. Once executed, a file called sample.exe with the size of around 53KB is being permanently used.

A brief analysis of the malware shows that immediately after execution it sets various registry keys so that the computer doesn’t start anymore in the normal way. In this mode  the user is forced to pay the ransom. Our tests have shown that with this variant, even booting in Safe mode and Safe Mode with confirmation will cause a blue screen (BSOD). This means that the only way to remove the malware is to boot the computer via a Rescue System and perform a full system scan and cleanup.

All Avira products detect the malicious files as  TR/Winlock.JQ and TR/Ransom.EB.


Sorin Mustaca

IT Security Expert

Alexander Vukcevic

VLAB Manager, Germany

via Avira – TechBlog

© Copyright 2013 Sorin Mustaca, All rights Reserved. Written For: Sorin Mustaca on Cybersecurity

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About the Author

Sorin Mustaca
Sorin Mustaca, (ISC)2 CSSLP, CompTIA Security+ and Project+, is working since year 2000 in the IT Security industry and worked between 2003-2014 for Avira as Product Manager for the known products used by over 100 million users world-wide. Today he is an independent IT Security Consultant focusing on Cybersecurity, secure software development and security for IoT and Automotive. He is also running his personal blog Sorin Mustaca on Cybersecurity and is the author of the free eBook Improve your security .

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