Author: Fox IT

Export corrupts Windows Event Log files

Exported .evtx files may contain corrupted data - Check interpretation of forensic tools. Author: Jeffrey Wassenaar Introduction As forensic investigators, we truly love log files. During the investigation of a system with a Microsoft Windows operating system, Windows Event Log files (.evtx) can be very useful. System events (such as logons) are logged, but applications … Continue reading Export corrupts Windows Event Log files →

mkYARA – Writing YARA rules for the lazy analyst

Writing YARA rules based on executable code within malware can be a tedious task. An analyst cannot simply copy and paste raw executable code into a YARA rule, because this code contains variable values, such as memory addresses and offsets. The analyst has to disassemble the code and wildcard all the pieces in the code … Continue reading mkYARA – Writing YARA rules for the lazy analyst →

Lessons learned from a Man-in-the-Middle attack

It’s become a widely accepted mantra that experiencing a cyber breach is a question of ‘when’ and not ‘if’. For Fox-IT ‘if’ became ‘when’ on Tuesday, September 19 2017, when we fell victim to a “Man-in-the-Middle” attack. As a result of the multi-layered security protection, detection and response mechanisms we had in place, the incident … Continue reading Lessons learned from a Man-in-the-Middle attack →

Fox-IT debunks report on ByLock app that landed 75,000 people in jail in Turkey

The Turkish government has been actively pursuing the prosecution of the participants of the Gülen movement in what it calls “the Fetullahist Terrorist Organization/Parallel State Structure (FETÖ/PDY)”. To this end, the Turkey’s National Intelligence Organization (Millî İstihbarat Teşkilatı or MİT in Turkish) has investigated the relation of a publicly available smart phone messaging application called … Continue reading Fox-IT debunks report on ByLock app that landed 75,000 people in jail in Turkey →

Cryptolocker variant Torrentlocker making new victims in NL

This posting is an update to Torrentlocker blog postings of October 15 and October 21. Introduction Since past weekend, the Netherlands were hit with another spam run spreading the Cryptolocker variant known as Torrentlocker. Torrentlocker presents itself to victims as Cryptolocker in all cases, however this is a completely different malware. Fox-IT received multiple reports … Continue reading Cryptolocker variant Torrentlocker making new victims in NL →

New Torrentlocker variant active in the Netherlands

Introduction The Netherlands was hit with a new spam run designed to spread a cryptolocker variant known as torrentlocker from Monday October 13th 2014 onwards. Please note that torrentlocker appears to present itself to victims as cryptolocker in all cases. Fox-IT now receives multiple reports of new victims in the Netherlands and we are currently … Continue reading New Torrentlocker variant active in the Netherlands →

Live blog on SSLv3 protocol vulnerability ‘POODLE’

Google has announced the discovery of a protocol vulnerability in SSLv3. This vulnerability allows an attacker to read contents of connections secured by SSLv3. SSLv3 is a Secure Sockets Layer (SSL) protocol that has been ratified in 1996. SSL is used to encrypt communications between clients and servers. It is usually integrated with webservers, mailservers or … Continue reading Live blog on SSLv3 protocol vulnerability ‘POODLE’ →

CryptoLocker ransomware intelligence report

In the beginning of September 2013, the CryptoLocker malware variant appeared in the wild, spread exclusively by the infamous P2P ZeuS (aka Gameover ZeuS) malware. CryptoLocker had a simple purpose: to act as ransomware, encrypting important files such as images and documents, and then asking the victim for money to unlock the files. Image source: … Continue reading CryptoLocker ransomware intelligence report →