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How to Fall Victim to Advanced Persistent Threats

During the last four years, I was engaged on incident response teams for several large advanced persistent threat (APT) cases involving different German corporations. In this time, we have developed methods and tools to detect compromised systems, while also planning and performing remediation. During the course of these investigations, I noticed that certain circumstances supported […]

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How to Write Simple but Sound Yara Rules – Part 3

It has been a while since I wrote „How to Write Simple but Sound Yara Rules – Part 2„. Since then I changed my rule creation method to generate more versatile rules that can also be used for in-memory detection. Furthermore new features were added to yarGen and yarAnalyzer. Binarly The most important feature of […]

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System Files Typical File Size Detection with YARA

YARA Rules to Detect Uncommon System File Sizes

YARA is an awesome tool especially for incident responders and forensic investigators. In my scanners I use YARA for anomaly detection on files. I already created some articles on „Detecting System File Anomalies with YARA“ which focus on the expected contents of system files but today I would like to focus on the size of […]

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Yara Signatures

How to Write Simple but Sound Yara Rules – Part 2

Months ago I wrote a blog article on „How to write simple but sound Yara rules„. Since then the mentioned techniques and tools have improved. I’d like to give you a brief update on certain Yara features that I frequently use and tools that I use to generate and test my rules. (mehr …)

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Threat Intel CSV Lookup in Splunk

Splunk Threat Intel IOC Integration via Lookups

Today most security teams have access to a lot of different information sources. On the one hand they collect log data from different sources and try to correlate them in a useful way in so-called SIEM systems. On the other hand they receive threat information from different sources like APT reports, public or private feeds […]

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Detect System File Manipulations with SysInternals Sysmon

SysInternals Sysmon is a powerful tool especially when it comes to anomaly detection. I recently developed a method to detect system file manipulations, which I would like to share with you. We know how to track processes with the standard Windows audit policy option „Audit process tracking“, but Sysmon messages contain much more information to […]

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APT Detection is About Metadata

People often ask me, why we changed the name of our scanner from „IOC“ to „APT“ scanner and if we did that only for marketing reasons. But don’t worry, this blog post is just as little a sales pitch as it is an attempt to create a new product class. I’ll show you why APT […]

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Yara signature definition

How to Write Simple but Sound Yara Rules

During the last 2 years I wrote approximately 2000 Yara rules based on samples found during our incident response investigations. A lot of security professionals noticed that Yara provides an easy and effective way to write custom rules based on strings or byte sequences found in their samples and allows them as end user to […]

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Bash Schwachstelle CVE-2014-6271 Shell Shock erkennen

Dieser Artikel enthält Information dazu, wie Sie die bash Schwachstelle CVE-2014-6271 Shell Shock erkennen und behandeln können. Betroffene Systeme Grundsätzlich sind alle Systeme betroffen, die eine “bash” einsetzen, also Linux Unix AIX Solaris HPUX D.h. auch viele Embedded Systems, Network Devices, Appliances Die Remote Ausnutzung der Schwachstelle bedarf aber eines remote erreichbaren Dienstes, der in […]

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Check Point Remote Access Client Auto Deployment

Setting up a client-to-site VPN using the Check Point (CP) Remote Access Client is a common scenario in CP infrastructures. As the central gateway is set up the Remote Access Client is started, connected to the gateway using valid user credentials, the gateway fingerprint needs to be verified and accepted on the first connection attempt […]

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