MoveBot: Battling inactivity one micro-exercise at a time

Many of our NVISO colleagues are very active during their free time. We have colleagues who go mountain-biking, rock climbing, swimming, running, ... The problem is that during the day, they often sit at their desk for four hours straight, grab some lunch, and go back to their desk to sit and work at their computers. To … Continue reading MoveBot: Battling inactivity one micro-exercise at a time

Critical Samba vulnerability CVE-2017-7494 – Impact on Belgium

The Samba Team disclosed vulnerability CVE-2017-7494: Remote code execution from a writable share. HD Moore reported that the vulnerability is simple to exploit: on an open, writable SMB share, a shared library has to be uploaded which can then be easily executed on that server. The Samba Team has released patches and new versions (the vulnerability … Continue reading Critical Samba vulnerability CVE-2017-7494 – Impact on Belgium

Using binsnitch.py to detect files touched by malware

Yesterday, we released binsnitch.py - a tool you can use to detect unwanted changes to the file sytem. The tool and documentation is available here: https://github.com/NVISO-BE/binsnitch. Binsnitch can be used to detect silent (unwanted) changes to files on your system. It will scan a given directory recursively for files and keep track of any changes it detects, based … Continue reading Using binsnitch.py to detect files touched by malware

Wcry ransomware – Additional analysis

Introduction Since May 12, a large number of organisations has fallen victim to the "wcry" (or "Wanacry") ransomware, which abuses the SMB exploits / vulnerabilities that were famously released in the Shadow Brokers data dump in April 2017. Our aim in this short blog post is not to repeat existing information, but communicate some additional … Continue reading Wcry ransomware – Additional analysis

Analysis of a CVE-2017-0199 Malicious RTF Document

There is a new exploit (CVE-2017-0199) going around for which a patch was released by Microsoft on 11/04/2017. In this post, we analyze an RTF document exploiting this vulnerability and provide a YARA rule for detection. rtfdump.py is a Python tool to analyze RTF documents. Running it on our sample produces a list with all "entities" … Continue reading Analysis of a CVE-2017-0199 Malicious RTF Document

CSCBE Challenge Write-up – Sufbo

The Sufbo challenge was tackled during the Cyber Security Challenge qualifiers and proved to be very difficult to solve. This write-up gives you a possible way of solving it! Credits All challenges of the Cyber Security Challenge are created by security professionals from many different organisations. The Sufbo challenge in particular was created by Adriaan Dens, … Continue reading CSCBE Challenge Write-up – Sufbo

Tracking threat actors through .LNK files

In the blog post .LNK downloader and bitsadmin.exe in malicious Office document we were asked the following question by Harlan Carvey: Did you parse the LNK file for things such as embedded MAC address, NetBIOS system name, any SID, and volume serial number? We did not do that at the time, however we see the value in … Continue reading Tracking threat actors through .LNK files