Category: SANS Full Feed

In this diary, I’ll show you a practical example of how steganography is used to hide payloads (or other suspicious data) from security tools and Security Analysts’ eyes. Steganography can be defined like this: It is the art and science of concealing a secret message, file, or image within an ordinary-looking carrier—such as a digital…

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Ever wonder where all the SMS spam comes from? If you are trying to send SMS “at scale,” there are a few options: You could sign up for a messaging provider like Twilio, the AWS SNS service, or several similar services. These services offer easily scriptable and affordable ways to send SMS messages. We have…

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In the last week I ran into some issues that I hadn’t anticipated: Residential IP changed, some honeypots inacessible remotely Rebuilit DShield-SIEM [1], Zeek logs not displaying   Be mindful of network interface labels First, an IP address changing for a residential network is not uncommon. Some ISPs may regularly change IP addresses for homes…

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In diary entry “xorsearch.py: Searching With Regexes” I showed how one can let xorsearch.py generate a YARA rule with a given regular expression. This is a feature in many of my tools that support YARA, and I call it “Ad Hoc Yara Rules“: rules that are created on the spot with your input. Here is…

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While the old adage stating that “the human factor is the weakest link in the cyber security chain” will undoubtedly stay relevant in the near (and possibly far) future, the truth is that the tech industry could – and should – help alleviate the problem significantly more than it does today. One clear example of…

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